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N-doped graphene quantum dot-decorated N-TiO2/P-doped porous hollow g-C_(3)N_(4) nanotube composite photocatalysts for antibiotic photodegradation and H2 production 被引量:2
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作者 Jingshu Yuan Yao Zhang +2 位作者 Xiaoyan Zhang Junjie Zhang Shen’gen Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CSCD 2024年第1期165-178,共14页
Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology r... Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology regulation, and heterojunction construction strategies to synthesize N-GQD/N-doped TiO_(2)/P-doped porous hollow g-C_(3)N_(4) nanotube (PCN) composite photocatalysts (denoted as G-TPCN). The optimal sample (G-TPCN doped with 0.1wt% N-GQD, denoted as 0.1% G-TPCN) exhibits significantly enhanced photoabsorption, which is attributed to the change in bandgap caused by elemental doping (P and N), the improved light-harvesting resulting from the tube structure, and the upconversion effect of N-GQDs. In addition, the internal charge separation and transfer capability of0.1% G-TPCN are dramatically boosted, and its carrier concentration is 3.7, 2.3, and 1.9 times that of N-TiO_(2), PCN, and N-TiO_(2)/PCN(TPCN-1), respectively. This phenomenon is attributed to the formation of Z-scheme heterojunction between N-TiO_(2) and PCNs, the excellent electron conduction ability of N-GQDs, and the short transfer distance caused by the porous nanotube structure. Compared with those of N-TiO_(2), PCNs, and TPCN-1, the H2 production activity of 0.1%G-TPCN under visible light is enhanced by 12.4, 2.3, and 1.4times, respectively, and its ciprofloxacin (CIP) degradation rate is increased by 7.9, 5.7, and 2.9 times, respectively. The optimized performance benefits from excellent photoresponsiveness and improved carrier separation and migration efficiencies. Finally, the photocatalytic mechanism of 0.1% G-TPCN and five possible degradation pathways of CIP are proposed. This study clarifies the mechanism of multiple modification strategies to synergistically improve the photocatalytic performance of 0.1% G-TPCN and provides a potential strategy for rationally designing novel photocatalysts for environmental remediation and solar energy conversion. 展开更多
关键词 N-doped TiO_(2) N-doped graphene quantum dots P-doped g-C_(3)N_(4) porous hollow nanotube heterojunction photocatalysis
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Tuning electronic properties of the S2/graphene heterojunction by strains from density functional theory
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作者 雷军辉 王秀峰 林建国 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第12期450-455,共6页
Based on the density functional calculations, the structural and electronic properties of the WS2/graphene heterojunction under different strains are investigated. The calculated results show that unlike the free mono... Based on the density functional calculations, the structural and electronic properties of the WS2/graphene heterojunction under different strains are investigated. The calculated results show that unlike the free mono-layer WS2, the monolayer WS2 in the equilibrium WS2/graphene heterojunctionis characterized by indirect band gap due to the weak van der Waals interaction. The height of the schottky barrier for the WS2/graphene heterojunction is 0.13 eV, which is lower than the conventional metal/MoS2 contact. Moreover, the band properties and height of schottky barrier for WS2/graphene heterojunction can be tuned by strain. It is found that the height of the schottky barrier can be tuned to be near zero under an in-plane compressive strain, and the band gap of the WS2 in the heterojunction is turned into a direct band gap from the indirect band gap with the increasing schottky barrier height under an in-plane tensile strain. Our calculation results may provide a potential guidance for designing and fabricating the WS2-based field effect transistors. 展开更多
关键词 ws2/graphene heterojunction density functional theory (DFT) Schottky barrier direct/indirect band gap
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Construction of 2D-2D TiO_2 nanosheet/layered WS_2 heterojunctions with enhanced visible-light-responsive photocatalytic activity 被引量:7
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作者 Yongchuan Wu Zhongmin liu +3 位作者 Yaru Li Jitao Chen Xixi Zhu Ping Na 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期60-69,共10页
Constructing nanocomposites that combine the advantages of composite materials,nanomaterials,and interfaces has been regarded as an important strategy to improve the photocatalytic activity of TiO2.In this study,2D‐2... Constructing nanocomposites that combine the advantages of composite materials,nanomaterials,and interfaces has been regarded as an important strategy to improve the photocatalytic activity of TiO2.In this study,2D‐2D TiO2 nanosheet/layered WS2(TNS/WS2)heterojunctions were prepared via a hydrothermal method.The structure and morphology of the photocatalysts were systematically characterized.Layered WS2(~4 layers)was wrapped on the surface of TiO2 nanosheets with a plate‐to‐plate stacked structure and connected with each other by W=O bonds.The as‐prepared TNS/WS2 heterojunctions showed higher photocatalytic activity for the degradation of RhB under visible‐light irradiation,than pristine TiO2 nanosheets and layered WS2.The improvement of photocatalytic activity was primarily attributed to enhanced charge separation efficiency,which originated from the perfect 2D‐2D nanointerfaces and intimate interfacial contacts between TiO2 nanosheets and layered WS2.Based on experimental results,a double‐transfer photocatalytic mechanism for the TNS/WS2 heterojunctions was proposed and discussed.This work provides new insights for synthesizing highly efficient and environmentally stable photocatalysts by engineering the surface heterojunctions. 展开更多
关键词 ws2 TiO2 NANOSHEET heterojunction Photocatalysis Visible‐light responsive
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A Simple and Highly-Efficient Approach for Construction of 2D Nanostructured H-BN/WS2 Heterojunction through Hydrothermal Method-Assisted Exfoliation and Their Friction Performance in Grease 被引量:2
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作者 Ma Zhansheng Liu Zan Cheng Zhilin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2020年第3期88-93,共6页
In this work,the 2D nanostructured h-BN/WS2 heterojunction was successfully prepared by the hydrothermal method-assisted exfoliation of bulk h-BN and WS2.The morphology and structure of the as-prepared heterojunction ... In this work,the 2D nanostructured h-BN/WS2 heterojunction was successfully prepared by the hydrothermal method-assisted exfoliation of bulk h-BN and WS2.The morphology and structure of the as-prepared heterojunction were determined by a series of characterization techniques.The mechanism for the formation of the as-prepared heterojunction was proposed.The friction coefficient and wear rate of the as-prepared h-BN/WS2 heterojunction-grease was decreased by 33.9%and 45.9%,respectively,as compared to those of the neat grease. 展开更多
关键词 heterojunction H-BN ws2 tribological property
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High-performance self-powered ultraviolet photodetector in SnO_(2)microwire/p-GaN heterojunction using graphene as charge collection medium 被引量:1
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作者 Tong Xu Mingming Jiang +3 位作者 Peng Wan Yang Liu Caixia Kan Daning Shi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第7期183-192,共10页
Graphene monolayer has been extensively applied as a transparency electrode material in photoelectronic devices due to its high transmittance,high carrier mobility,and ultrafast carrier dynamics.In this study,a high-p... Graphene monolayer has been extensively applied as a transparency electrode material in photoelectronic devices due to its high transmittance,high carrier mobility,and ultrafast carrier dynamics.In this study,a high-performance self-powered photodetector,which is made of a SnO_(2)microwire,p-type GaN film,and monolayer graphene transparent electrode,was proposed and fabricated.The detector is sensitive to ultraviolet light signals and illustrates pronounced detection performances,including a peak respon-sivity∼223.7 mA W^(-1),a detectivity∼6.9×10^(12)Jones,fast response speed(rising/decaying times∼18/580μs),and excellent external quantum efficiency∼77%at 360 nm light illumination without exter-nal power supply.Compared with the pristine SnO_(2)/GaN photodetector using ITO electrode,the device performances of responsivity and detectivity are significantly increased over 6×10^(3)%and 3×10^(3)%,respectively.The performance-enhanced characteristics are mainly attributed to the high-quality het-erointerface of n-SnO_(2)/p-GaN,the highly conductive capacity,and the unique transparency of graphene electrodes.Particularly,the built-in potential formed at the SnO_(2)/GaN heterojunction interface could be strengthened by the Schottky potential barrier derived from the graphene electrode and SnO_(2)wire,en-hancing the carrier collection efficiency through graphene as a charge collection medium.This work is of great importance and significance to developing excellent-performance ultraviolet photodetectors for photovoltaic and optoelectronic applications in a self-powered operation manner. 展开更多
关键词 Self-powered photodetector SnO_(2)microwires Monolayer graphene electrode heterojunction Schottky barrier
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Enhanced photocatalytic performance of Bi_(2)O_(2)CO_(3)/Bi_(4)O_(5)Br_(2)/reduced graphene oxide Z-schemehe terojunction via a one-pot room-temperature synthesis
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作者 Xiaoge Wu Lei Yan +6 位作者 Rongrong Qin Qikai Zhang Wei Yang Xiaozhi Wang Yongcai Zhang Min Luo Jianhua Hou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第4期418-427,共10页
Bi_(2)O_(2)CO_(3)(BOC)/Bi_(4)O_5Br_(2)(BOB)/reduced graphene oxide(rGO)Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature method.Ultra-thin nanosheet... Bi_(2)O_(2)CO_(3)(BOC)/Bi_(4)O_5Br_(2)(BOB)/reduced graphene oxide(rGO)Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature method.Ultra-thin nanosheets of BOC and BOB were grown in situ on r GO.The formed 2D/2D direct Z-scheme heterojunction of BOC/BOB with oxygen vacancies(OVs)effectively leads to lower negative electron reduction potential of BOB as well as higher positive hole oxidation potential of BOC,showing improved reduction/oxidation ability.Particularly,rGO is an acceptor of the electrons from the conduction band of BOC.Its dual roles significantly improve the transfer performance of photo-induced charge carriers and accelerate their separation.With layered nanosheet structure,rich OVs,high specific surface area,and increased utilization efficiency of visible light,the multiple synergistic effects of BOC/BOB/rGO can achieve effective generation and separation of the electron-holes,thereby generating more·O_(2)^(-)and h^(+).The photocatalytic reduction efficiency of CO_(2)to CO(12.91μmol/(g·hr))is three times higher than that of BOC(4.18μmol/(g·hr)).Moreover,it also achieved almost 100%removal of Rhodamine B and cyanobacterial cells within 2 hours. 展开更多
关键词 Bi_(2)O_(2)CO_(3) Bi_(4)O_(5)Br_(2) Reduced graphene oxide Z-scheme heterojunction Photocatalysis CO_(2)reduction
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Lightweight and High-Performance Microwave Absorber Based on 2D WS2-RGO Heterostructures 被引量:13
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作者 Deqing Zhang Tingting Liu +5 位作者 Junye Cheng Qi Cao Guangping Zheng Shuang Liang Hao Wang MaoSheng Cao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2019年第3期21-35,共15页
Two-dimensional(2D)nanomaterials are categorized as a new class of microwave absorption(MA)materials owing to their high specific surface area and peculiar electronic properties.In this study,2D WS2-reduced graphene o... Two-dimensional(2D)nanomaterials are categorized as a new class of microwave absorption(MA)materials owing to their high specific surface area and peculiar electronic properties.In this study,2D WS2-reduced graphene oxide(WS2-rGO)heterostructure nanosheets were synthesized via a facile hydrothermal process;moreover,their dielectric and MA properties were reported for the first time.Remarkably,the maximum reflection loss(RL)of the sample-wax composites containing 40 wt% WS2-rGO was-41.5 dB at a thickness of 2.7 mm;furthermore,the bandwidth where RL<-10 dB can reach up to 13.62 GHz(4.38-18 GHz).Synergistic mechanisms derived from the interfacial dielectric coupling and multiple-interface scattering after hybridization of WS2 with rGO were discussed to explain the drastically enhanced microwave absorption performance.The results indicate these lightweight WS2-rGO nanosheets to be potential materials for practical electromagnetic wave-absorbing applications. 展开更多
关键词 2D ws2 nanosheets Reduced graphene oxide HETEROSTRUCTURE Microwave absorption
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Low-cost 0D and 2D carbon material co-decorated titanium dioxide ternary heterojunction for rapid and efficient bacteria killing under visible light
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作者 Yuan Li Peng-Feng Yuan +7 位作者 Chao-Feng Wang Xiang-Mei Liu Sheng-Li Zhu Zhao-Yang Li Zhen-Duo Cui Hui Jiang Paul KChu Shui-Lin Wu 《cMat》 2024年第2期20-29,共10页
Recently,the issue of bacterial resistance has gotten worse because of the overuse of antibiotics.The newborn superbacteria,such as vancomycin-resistant bacteria,were hard to kill,inspiring researchers to find new way... Recently,the issue of bacterial resistance has gotten worse because of the overuse of antibiotics.The newborn superbacteria,such as vancomycin-resistant bacteria,were hard to kill,inspiring researchers to find new ways to kill the bacteria efficiently.TiO_(2) was used as an efficient photocatalyst for water split-ting and pollutant degradation.However,the weak efficiency limited the application to solve the drug-resistance problem.Consequently,the incorpora-tion of low-cost 0D carbon quantum dots(CQDs)and 2D graphene oxide(GO)was pursued to amplify the visible light absorption capabilities of TiO_(2) and thereby elevate its photocatalytic activity.After forming the heterogeneous interface of CQDs and TiO_(2),CQDs converted part of visible light into wave-length less than 400 nm using the up-conversion property.The modification of CQDs enabled electrons to be easily transferred from the conduction band of CQDs to the conduction band of TiO_(2).Meanwhile,GO can act as an electron acceptor,reduce the recombination efficiency of holes and electrons,and transfer the photogenerated electrons in the redox reaction in the heterogeneous interface.Because of the excellent absorption of GO,TiO_(2)/CQDs/GO reached 57.8℃after 20 min irradiation under 1.5 times sunlight,which provided a prerequisite for photodynamic antibacterial therapy/photothermal antibacterial therapy synergistic antibacterial potential.TiO_(2)/CQDs/GO possessed an anti-bacterial efficiency as high as 99.3%toward Staphylococcus aureus which has a bright future in disinfection in vivo and medical devices as well as water sterilization. 展开更多
关键词 anitbacterial carbon quantum dots graphene oxide heterojunction TiO_(2)
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ZnIn_(2)S_(4)-CdS-石墨烯复合薄膜的光催化Cr(Ⅵ)还原性能研究 被引量:1
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作者 钟永鸣 陈炳坚 杨信哲 《广东石油化工学院学报》 2023年第4期26-31,37,共7页
通过水热法在自组装的石墨烯膜上原位生长ZnIn_(2)S_(4)纳米片,再通过连续离子层吸附与反应(SILAR法)负载CdS纳米颗粒,形成ZnIn_(2)S_(4)-CdS异质结。对复合薄膜作物相分析,形貌观察,光学特性分析和光催化Cr(Ⅵ)还原能力对比。研究表明,... 通过水热法在自组装的石墨烯膜上原位生长ZnIn_(2)S_(4)纳米片,再通过连续离子层吸附与反应(SILAR法)负载CdS纳米颗粒,形成ZnIn_(2)S_(4)-CdS异质结。对复合薄膜作物相分析,形貌观察,光学特性分析和光催化Cr(Ⅵ)还原能力对比。研究表明,ZnIn_(2)S_(4)与CdS复合形成的异质结与石墨烯膜在提高性能方面起到重要作用,在40 mmol/L浓度下循环8次得到的ZnIn_(2)S_(4)-CdS-石墨烯复合薄膜性能最佳,80 min内可还原94.3%的Cr(Ⅵ)。 展开更多
关键词 ZnIn_(2)S_(4)-CdS异质结 石墨烯 光催化 Cr(Ⅵ)还原
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Exploitation of Bi2O2Se/graphene van der Waals heterojunction for creating efficient photodetectors and short-channel field-effect transistors 被引量:8
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作者 Congwei Tan Shipu Xu +4 位作者 Zhenjun Tan Luzhao Sun Jinxiong Wu Tianran Li Hailin Peng 《InfoMat》 SCIE CAS 2019年第3期390-395,共6页
The formation of heterojunction within solid-state devices enables them with eventually high performances,but provides a challenge for material synthesis and device fabrication because strict conditions such as lattic... The formation of heterojunction within solid-state devices enables them with eventually high performances,but provides a challenge for material synthesis and device fabrication because strict conditions such as lattice match are needed.Herein,we show a facile method to fabricate a van der Waals(vdW)heterojunction between two-dimensional(2D)bismuth oxyselenide(Bi2O2Se)and graphene,during which the graphene is directly transferred to the Bi2O2Se and served as a lowcontract-resistant electrode with small work function mismatch(~50 meV).As an optoelectronic device,the Bi2O2Se/graphene vdW heterojunction allows for the efficient sensing toward 1200-nm incident laser.Regarding the application of fieldeffect transistors(FETs),the short-channel(50 nm)sample can be synthesized by utilizing these two 2D materials(ie,channel:Bi2O2Se;drain/source terminal:graphene)and the n-type characteristic can be observed with the accordant field modulation.It is confirmed that we show a simple way to prepare the vdW heterojunction which is aiming to the high-performance applications among optoelectronics and FETs. 展开更多
关键词 Bi2O2Se graphene van der Waals heterojunctions
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Picosecond electrical response in graphene/MoTe_(2) heterojunction with high responsivity in the near infrared region
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作者 Zhouxiaosong Zeng Kai Braun +12 位作者 Cuihuan Ge Martin Eberle Chenguang Zhu Xingxia Sun Xin Yang Jiali Yi Delang Liang Yufan Wang Lanyu Huang Ziyu Luo Dong Li Anlian Pan Xiao Wang 《Fundamental Research》 CAS 2022年第3期405-411,共7页
Understanding the fundamental charge carrier dynamics is of great significance for photodetectors with both high speed and high responsivity.Devices based on two-dimensional(2D)transition metal dichalcogenides can exh... Understanding the fundamental charge carrier dynamics is of great significance for photodetectors with both high speed and high responsivity.Devices based on two-dimensional(2D)transition metal dichalcogenides can exhibit picosecond photoresponse speed.However,2D materials naturally have low absorption,and when increasing thickness to gain higher responsivity,the response time usually slows to nanoseconds,limiting their photodetection performance.Here,by taking time-resolved photocurrent measurements,we demonstrated that graphene/MoTe_(2) van der Waals heterojunctions realize a fast 10 ps photoresponse time owing to the reduced average photocurrent drift time in the heterojunction,which is fundamentally distinct from traditional Dirac semimetal photodetectors such as graphene or Cd_(3)As_(2) and implies a photodetection bandwidth as wide as 100 GHz.Furthermore,we found that an additional charge carrier transport channel provided by graphene can ef-fectively decrease the photocurrent recombination loss to the entire device,preserving a high responsivity in the near-infrared region.Our study provides a deeper understanding of the ultrafast electrical response in van der Waals heterojunctions and offers a promising approach for the realization of photodetectors with both high responsivity and ultrafast electrical response. 展开更多
关键词 Two-dimension material graphene/MoTe_(2)heterojunction Near infrared photodetector Scanning photocurrent microscopy Time-resolved photocurrent
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Highly efficient tunable photodetector with a bipolar response in van der Waals heterojunctions
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作者 SHI ChaoFan ZHANG Shi +7 位作者 XIAO KeNing ZHANG LiBo HAN Li ZHU YuLin TANG WeiWei LIU ChangLong LI GuanHai CHEN XiaoShuang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第2期639-646,共8页
The heterojunction integration of two-dimensional(2D)materials via van der Waals(vdW)forces,unencumbered by lattice and processing constraints,constitutes an efficacious approach to enhance the overall optoelectronic ... The heterojunction integration of two-dimensional(2D)materials via van der Waals(vdW)forces,unencumbered by lattice and processing constraints,constitutes an efficacious approach to enhance the overall optoelectronic performance of photodetectors,due to an assortment of distinctive light-matter interactions.Nonetheless,vdW heterojunction photodetectors based on transition metal dichalcogenides(TMDs)face an inevitable trade-off between low dark currents and high responsivity,curtailing the application potential of myriad novel optoelectronic components in sensing,spectral,and communication systems.In this study,we present the successful actualization of a highly sensitive,self-powered,and gate-tunable bipolar response photodetector.The mechanisms underlying photocurrent generation were scrutinized via bias-,power-,and position-dependent mapping photoresponse measurements,identifying the photovoltaic effect,which is attributable to the Schottky junction’s built-in electric field,as the predominant mechanism.The prototype Au-WS2-graphene photodetector exhibits a remarkable light on/off ratio of 1.2×10^(6),a specific detectivity of 6.12×10^(11)cm H^(z1/2)W^(-1)with 20μs response time at 638 nm.The wide gate-tunable responsivity provides an adjustability scope,ranging from 0.9 to 3.1 A W^(-1).Notably,the device demonstrates an exceptional linear photocurrent response,with a linear dynamic range(LDR)value approximating 130 dB,which significantly surpasses that of other photodetectors based on TMDs. 展开更多
关键词 ws2/graphene van der Waals heterojunction gate-tunable bipolar response
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Heterostructured graphene quantum dot/WSe2/Si photo-detector with suppressed dark current and improved detectivity 被引量:6
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作者 Mengxing Sun Qiyi Fang +8 位作者 Dan Xie Yilin Sun Liu Qian Jianlong Xu Peng Xiao Changjiu Teng Weiwei Li Tianling Ren Yanfeng Zhang 《Nano Research》 SCIE EI CAS CSCD 2018年第6期3233-3243,共11页
A high-performance heterojunction photodetector is formed by combining an n-type Si substrate with p-type monolayer WSe2 obtained using physical vapor deposition. The high quality of the WSe2/Si heterojunction is demo... A high-performance heterojunction photodetector is formed by combining an n-type Si substrate with p-type monolayer WSe2 obtained using physical vapor deposition. The high quality of the WSe2/Si heterojunction is demonstrated by the suppressed dark current of I nA and the extremely high rectification ratio of 107. Under illumination, the heterojunction exhibits a wide photoresponse range from ultraviolet to near-infrared radiation. The introduction of graphene quantum dots (GQDs) greatly elevates the photodetective capabilities of the heterojunction with strong light absorption and long carrier lifetimes. The GQDs/WSe2/Si heterojunction exhibits a high responsivity of -707 mA·W^-1, short response time of 0.2 ms, and good specific detectivity of -4.51×10^9 Jones. These properties suggest that the GQDs/WSe2/Si heterojunction holds great potential for application in future high- performance photodetectors. 展开更多
关键词 heterojunction PHOTODETECTOR SI wse2 graphene quantum dots
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Q-switching of waveguide lasers based on graphene/WS_2 van der Waals heterostructure 被引量:9
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作者 ZIQI LI CHEN CHENG +6 位作者 NINGNING DONG CAROLINA ROMERO QINGMING LU JUN WANG JAVIER RODRíGUEZ VáZQUEZ DE ALDANA YANG TAN FENG CHEN 《Photonics Research》 SCIE EI 2017年第5期406-410,共5页
We report on the operation of passively Q-switched waveguide lasers at 1 μm wavelength based on a graphene∕WS_2 heterostructure as a saturable absorber(SA). The gain medium is a crystalline Nd:YVO_4 cladding wavegui... We report on the operation of passively Q-switched waveguide lasers at 1 μm wavelength based on a graphene∕WS_2 heterostructure as a saturable absorber(SA). The gain medium is a crystalline Nd:YVO_4 cladding waveguide produced by femtosecond laser writing. The nanosecond waveguide laser operation at 1064 nm has been realized with the maximum average output power of 275 m W and slope efficiency of 37%. In comparison with the systems based on single WS_2 or graphene SA, the lasing Q-switched by a graphene∕WS_2 heterostructure SA possesses advantages of a higher pulse energy and enhanced slope efficiency, indicating the promisingapplications of van der Waals heterostructures for ultrafast photonic devices. 展开更多
关键词 ws Q-switching of waveguide lasers based on graphene/ws2 van der Waals heterostructure der
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Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS_(2) nanoparticles 被引量:8
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作者 Zai-Hua Duan Qiu-Ni Zhao +5 位作者 Cheng-Zhen Li Si Wang Ya-Dong Jiang Ya-Jie Zhang Bo-Hao Liu Hui-Ling Tai 《Rare Metals》 CSCD 2021年第7期1762-1767,共6页
Most resistance-type humidity sensors exhibit negative humidity sensitivity,i.e.,their resistance decreases with a corresponding increase in humidity.This is primarily attributed to the dominant role of ionic conducti... Most resistance-type humidity sensors exhibit negative humidity sensitivity,i.e.,their resistance decreases with a corresponding increase in humidity.This is primarily attributed to the dominant role of ionic conduction in adsorbed water.In this work,a humidity sensor based on a p-type reduced graphene oxide(p-rGO)with positive humidity sensitivity is proposed.Moreover,its positive humidity sensing response is further enhanced by n-type WS_(2) nanoparticles modification.The results show that both rGO and r GO/WS_(2) humidity sensors have good linear response in the relative humidity(RH)range of0%-91.5%.The sensitivity of the rGO/WS_(2) humidity sensor is 1.87 times that of rGO humidity sensor,which is mainly attributed to p-n heterojunction between rGO and WS_(2).Besides,the r GO/WS_(2) humidity sensor has small humidity hysteresis(-3%RH)and good repeatability.This work demonstrates a humidity sensor based on rGO/WS_(2) composite film and provides a facile route for fabricating humidity sensor with positive humidity sensing properties. 展开更多
关键词 Reduced graphene oxide ws2 nanoparticles heterojunction Humidity sensor Humidity sensing mechanism
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High-responsivity,self-driven photodetectors based on monolayer WS2/GaAs heterojunction 被引量:2
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作者 KUILONG LI WENJIA WANG +3 位作者 JIANFEI LI WENXIN JIANG MIN FENG YANG HE 《Photonics Research》 SCIE EI CSCD 2020年第8期1368-1374,共7页
Constructing two-dimensional(2D)layered materials with traditional three-dimensional(3D)semiconductors into complex heterostructures has opened a new platform for the development of optoelectronic devices.Herein,large... Constructing two-dimensional(2D)layered materials with traditional three-dimensional(3D)semiconductors into complex heterostructures has opened a new platform for the development of optoelectronic devices.Herein,large-area high performance self-driven photodetectors based on monolayer WS2∕GaAs heterostructures were successfully fabricated with a wide response spectrum band ranging from the ultraviolet to near-infrared region.The detector exhibits an overall high performance,including high photoresponsivity of 65.58 A/W at 365 nm and 28.50 A/W at 880 nm,low noise equivalent power of 1.97×10^−15 W∕Hz1∕2,high detectivity of 4.47×10^12 Jones,and fast response speed of 30/10 ms.This work suggests that the WS2∕GaAs heterostructure is promising in future novel optoelectronic device applications,and also provides a low-cost,easy-to-process method for the preparation of 2D/3D heterojunction-based devices. 展开更多
关键词 ws2 heterojunction ULTRAVIOLET
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TiO_2-石墨烯电极光电催化处理罗丹明B的研究 被引量:1
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作者 吴丹 姜智文 +1 位作者 王椰 李梦瑶 《沈阳化工大学学报》 CAS 2019年第1期54-57,共4页
通过溶胶凝胶法制备介孔TiO_2-石墨烯复合薄膜,对该薄膜做扫描电镜,紫外-可见漫发射透射光谱,X-射线光谱等表征.结果表明:制备的介孔TiO_2-石墨烯复合薄膜中TiO_2以锐钛矿晶型存在,石墨烯的掺杂使其对光的吸收增强.对该薄膜的光电流密... 通过溶胶凝胶法制备介孔TiO_2-石墨烯复合薄膜,对该薄膜做扫描电镜,紫外-可见漫发射透射光谱,X-射线光谱等表征.结果表明:制备的介孔TiO_2-石墨烯复合薄膜中TiO_2以锐钛矿晶型存在,石墨烯的掺杂使其对光的吸收增强.对该薄膜的光电流密度测试结果表明石墨烯掺杂后光电流密度显著提高.在光电催化降解罗丹明B的实验中,由于掺杂其中的石墨烯起到了分离光生电子和空穴的作用,与单纯的介孔TiO_2薄膜相比,反应动力学常数提高了1. 6倍. 展开更多
关键词 石墨烯光催化异质结 介孔TiO 2-石墨烯复合薄膜 光电催化降解罗丹明B 石墨烯
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石墨烯/MoS_(2)异质结的界面相互作用及其肖特基调控的理论研究
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作者 汤哲 庞国旺 +1 位作者 张丽丽 黄以能 《分子科学学报》 CAS 北大核心 2023年第4期360-368,共9页
本文基于第一性原理方法,系统研究了外电场对石墨烯/MoS2范德瓦耳斯异质结界面相互作用及其电子性质的影响.计算结果表明石墨烯和MoS2之间通过微弱的范德瓦耳斯力结合形成异质结,石墨烯/MoS2异质结的能带基本上是单层石墨烯和单层MoS_(2... 本文基于第一性原理方法,系统研究了外电场对石墨烯/MoS2范德瓦耳斯异质结界面相互作用及其电子性质的影响.计算结果表明石墨烯和MoS2之间通过微弱的范德瓦耳斯力结合形成异质结,石墨烯/MoS2异质结的能带基本上是单层石墨烯和单层MoS_(2)能带结构的简单叠加并形成了N型肖特基势垒;由于异质结的石墨烯层的电子向MoS_(2)层转移,导致石墨烯表面带正电,MoS_(2)表面带负电,在异质结内部形成了方向由石墨烯指向MoS2的内建电场.此外,对异质结施加不同强度的负电场时,体系的接触类型逐渐由N型肖特基接触类型转变为欧姆接触;对异质结施加不同强度的正电场时,体系的P型肖特基势垒呈降低趋势,体系的N型肖特基势垒呈现先缓慢升高再急剧下降的特点,在电场强度提高至5.0 V·nm^(-1)附近时,接触类型由N型肖特基接触转变为P型肖特基接触.此项工作将对相关二维场效应晶体管的设计提供参考. 展开更多
关键词 电场调控 异质结 肖特基势垒 石墨烯/MoS_(2)
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Enhance d thermal-assiste d photocatalytic CO_(2) reduction by RGO/H-CN two-dimensional heterojunction
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作者 Yuhan Liu Jing Shang Tong Zhu 《Journal of Materials Science & Technology》 SCIE EI CAS 2024年第9期36-47,共12页
Carbon dioxide(CO_(2))can be reduced to high-value fuels using the photocatalysis(PC)technique,which holds immense potential for tackling environmental issues and energy crises.The construction of metalfree photocatal... Carbon dioxide(CO_(2))can be reduced to high-value fuels using the photocatalysis(PC)technique,which holds immense potential for tackling environmental issues and energy crises.The construction of metalfree photocatalyst capable of utilizing infrared light to execute thermal-assisted photocatalysis(TPC)remains a challenge.In this study,reduced graphene oxide(RGO)with full-spectrum absorption was used as a thermal-assisted photocatalyst in CO_(2) reduction.It exhibited higher CO_(2) reduction efficiency under the visible and infrared irradiation than the sole visible irradiation.RGO-5(GO treated at 120℃ for 5 h)presented the highest defect density and C-OH/C-O-C content,leading to the best PC and TPC efficiencies.RGO was further engineered with HCl protonated g-C_(3)N_(4)(H-CN)to obtain two-dimensional heterojunction RGO/H-CN,which demonstrated the S-scheme charge transfer process.Owing to the synergistic effect of heterojunction and thermal assistance,RGO/H-CN exhibited better CO_(2) reduction efficiencies in both PC and TPC than RGO.The largest yields of CO and CH4 were achieved in 15%RGO/H-CN.This research provides new insights for applying RGO as thermal-assisted heterojunction photocatalyst for efficient CO_(2) reduction. 展开更多
关键词 CO_(2)reduction Thermal-assisted photocatalysis heterojunction Reduced graphene oxide g-C_(3)N_(4)
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Toward neglligible memories based heterostructures charge loss in on vertically charge injection integrated 2D
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作者 Dongri Qiu Dong Uk Lee +2 位作者 Kyoung Su Lee Sang Woo Pak Eun Kyu Kim 《Nano Research》 SCIE EI CAS CSCD 2016年第8期2319-2326,共8页
Two-dimensional (2D) crystals have a multitude of forms, including semi-metals, semiconductors, and insulators, which are ideal for assembling isolated 2D atomic materials to create van der Waals (vdW) heterostruc... Two-dimensional (2D) crystals have a multitude of forms, including semi-metals, semiconductors, and insulators, which are ideal for assembling isolated 2D atomic materials to create van der Waals (vdW) heterostructures. Recently, artificially-stacked materials have been considered promising candidates for nanoelectronic and optoelectronic applications. In this study, we report the vertical integration of layered structures for the fabrication of prototype non-volatile memory devices. A semiconducting-tungsten-disulfide-channel-based memory device is created by sandwiching high-density-of-states multi-layered graphene as a carrier-confining layer between tunnel barriers of hexagonal boron nitride (hBN) and silicon dioxide. The results reveal that a memory window of up to 20 V is opened, leading to a high current ratio (〉103) between programming and erasing states. The proposed design combination produced layered materials that allow devices to attain perfect retention at 13% charge loss after 10 years, offering new possibilities for the integration of transparent, flexible electronic systems. 展开更多
关键词 two-dimensional 2D)material graphene hexagonal boron nitride(hBN) tungsten disulphide ws2 HETEROSTRUCTURE
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