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A novel approach for observing band gap crossings using the SIMS technique in Pb_(1-x)Sn_(x)Te
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作者 Zeinab Khosravizadeh Piotr Dziawa +2 位作者 Sania Dad Andrzej Dabrowski RafałJakiela 《Journal of Semiconductors》 EI CAS CSCD 2024年第11期51-57,共7页
This paper introduces a pioneering application of secondary ion mass spectrometry(SIMS)for estimating the electronic properties of Pb_(1-x)Sn_(x)Te,a compound categorized as a topological crystalline insulator.The pro... This paper introduces a pioneering application of secondary ion mass spectrometry(SIMS)for estimating the electronic properties of Pb_(1-x)Sn_(x)Te,a compound categorized as a topological crystalline insulator.The proposed approach marks the first application of SIMS for such estimations and focuses on investigating variations in ionization probabilities and shifts in the energy distribution of secondary ions.The ionization probabilities are influenced by pivotal parameters such as the material's work function and electron affinity.The derivation of these parameters hinges upon the energy gap's positioning relative to the vacuum level for varying values of within the Pb_(1-x)Sn_(x)Te compound.The findings elucidate noteworthy alterations in SIMS signals,particularly near the critical point of band-gap closing. 展开更多
关键词 SIMS TCI ionization probability work function Pb_(1-x)Sn_(x)te band-gap closing
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Zn_(x)Cd_(1-x)S固溶体的制备及光降解亚甲基蓝的性能研究
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作者 覃艳 《天津化工》 CAS 2024年第3期44-48,共5页
本文通过水热法成功制备了Zn_(x)Cd_(1-x)S固溶体材料,并通过光催化降解亚甲基蓝(MB),探究了材料的光催化性能。光催化实验结果表明,Zn_(0.2)Cd_(0.8)S固溶体材料的去除效率达到了81.94%,接近于纯CdS的1.43倍和ZnS的1.47倍。通过XRD、UV... 本文通过水热法成功制备了Zn_(x)Cd_(1-x)S固溶体材料,并通过光催化降解亚甲基蓝(MB),探究了材料的光催化性能。光催化实验结果表明,Zn_(0.2)Cd_(0.8)S固溶体材料的去除效率达到了81.94%,接近于纯CdS的1.43倍和ZnS的1.47倍。通过XRD、UV-vis漫反射吸收光谱和EIS等表征,探究了光催化性能增强的可能原因。结果表明,所构建的Zn_(0.2)Cd_(0.8)S固溶体材料具有较高的载流子分离效率,并且在可见光区增强了光吸收能力,提高了光催化性能。 展开更多
关键词 Zn_(x)cd_(1-x)S 亚甲基蓝 光催化
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Sulfur vacancies-induced“Electron Bridge”in Ni_(4)Mo/Sv-Zn_(x)Cd_(1-x)S regulates electron transfer for efficient H_(2)-releasing photocatalysis 被引量:1
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作者 Xin Zhang Manyi Gao +3 位作者 Longyu Qiu Jie Sheng Weiwei Yang Yongsheng Yu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第4期64-71,共8页
Despite the existence of plentiful photocatalyst heterojunctions,their separation efficiency and charge flow precision remain low on account of lacking interfacial modulation.Herein,through a defect-induced heterojunc... Despite the existence of plentiful photocatalyst heterojunctions,their separation efficiency and charge flow precision remain low on account of lacking interfacial modulation.Herein,through a defect-induced heterojunction constructing strategy,Ni4Mo alloys were in-situ grown on the unsaturated coordinated sulfur atoms of sulfur vacancies-rich ZCS(Sv-ZCS)via interfacial Ni-S covalent bonds.The experimental and theoretical results reveal that these unsaturated sulfur atoms induced by sulfur vacancies vastly facilitate to anchor more Ni-Mo nanoparticles and form abundant Ni-S covalent bonds,meanwhile,these sulfur vacancies could form dual internal electric field(IEF)and work with Ni-S covalent bonds as“Electron Bridge”to further accelerate photoelectrons transfer,as well as promote the activation of water molecules and the desorption of hydrogen proton.Accordingly,the optimized Ni_(4)Mo/Sv-ZCS composite achieves an improved photocatalytic hydrogen evolution(PHE)rate of 94.69 mmol h^(-1)g^(-1)without an evident decrease after 6 cycles of photocatalytic tests,which is 21.2 and 1.94 times higher than those of Pt/ZCS and Ni_(4)Mo/ZCS,respectively.This tactic opens a new way for optimizing Zn_(x)Cd_(1-x)S-based heterojunctions by constructing sulfur vacancies and covalent bonds as“Electron Bridge”to enhance the activity of PHE. 展开更多
关键词 Ni_(4)Mo Sulfur vacancies-rich Zn_(x)cd_(1-x)S Electron Bridge Photocatalytic hydrogen evolution
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Hg_(1-x)Cd_xTe-HgTe超晶格的结构研究
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作者 于福聚 《人工晶体学报》 EI CAS CSCD 北大核心 2000年第S1期239-,共1页
红外技术正在从机械扫描成像系统向新一代固体成像系统过渡。Hg1 xCdxTe红外焦平面列阵器件是最佳选择。它的禁带宽度随组分在 0~ 1 .6eV之间可调 ,也就是说 ,它可做成多种响应波长的红外探测器 ,而且其探测率要比GaAs量子阱、InSb都... 红外技术正在从机械扫描成像系统向新一代固体成像系统过渡。Hg1 xCdxTe红外焦平面列阵器件是最佳选择。它的禁带宽度随组分在 0~ 1 .6eV之间可调 ,也就是说 ,它可做成多种响应波长的红外探测器 ,而且其探测率要比GaAs量子阱、InSb都要高出一个多数量级。当然Hg1 xCdxTe材料也有某些缺点 ,例如难以做到大面积结构完整、组分均匀 ,难以控制其截止波长 ,并且暗电流较大等。与Hg1 xCdxTe体材料相比 ,Hg1 xCdxTe HgTe超晶格可以通过调节HgTe层和Hg1 xCdxTe层的相应厚度来控制其截止波长 ,而且还有暗电流小等优点。因此Hg1 xCdxTe HgTe超晶格材料不仅在研制长波和超长波红外量子阱探测器方面有潜在优势 ,而且在研制MIS红外器件方面也显示出优越性 (Hg1 xCdxTe HgTe超晶格MIS器件的击穿电压比Hg1 xCdxTe体材料MIS器件的还高 )。Fauriep和Becker等人对Hg1 xCdxTe HgTe超晶格的制备工艺进行了研究 ,Tardotp等人研究了CdTe HgTe超晶体中Hg和Cd的互扩散 ,而且Hg1 xCdTe -HgTe的结构特征和光电特性的研究引起了广泛关注。研究MBE法生长的Hg1 xCdxTe HgTe超晶格的结构特征 ,可弄清结构缺陷的生长机制和分布规律 ,并有助于研究晶体生长的机理。本文介绍了用X射线衍射测定Hg1 xCdxTe HgTe超晶格样品在 ( 0 0 2 )附近? 展开更多
关键词 分子束外延生长 hg_(1-x)cd_xte-hgte超晶格 x射线衍射
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Hg_(1-x)Cd_xTe的拉曼光谱
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作者 黄仕华 黄守江 +1 位作者 雷春红 张鹏翔 《红外技术》 CSCD 北大核心 2000年第2期39-42,共4页
我们发现Hg1 -xCdxTe的拉曼散射峰随着温度的变化会发生频移 ,它的二级散射峰来自LO1 +LO1 ,LO1 +LO2 ,LO2 +LO2 ,并且它们的强度对晶体的完整性较敏感。同时也发现Hg1 -xCdxTe中的Te的沉淀相和Te的氧化物相的拉曼散射峰。
关键词 拉曼散射 半导体化学物 红外探测器材料
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Dual-functional marigold-like Zn_(x)Cd_(1-x)S homojunction for selective glucose photoreforming with remarkable H_(2)coproduction 被引量:1
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作者 Fuyan Kang Cai Shi +7 位作者 Yeling Zhu Malin Eqi Junming Shi Min Teng Zhanhua Huang Chuanling Si Feng Jiang Jinguang Hu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第4期158-167,共10页
The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen(H_(2))and value-added chemicals production by biomass photoreforming.Herein,a ... The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen(H_(2))and value-added chemicals production by biomass photoreforming.Herein,a novel dual-functional marigold-like Zn_(x)Cd_(1-x)S homojunction has been the production of lactic acid with high-yield and H_(2)with high-efficiency by selective glucose photoreforming.The optimized Zn_(0.3)Cd_(0.7)S exhibits outstanding H_(2)generation(13.64 mmol h^(-1)g^(-1)),glucose conversion(96.40%),and lactic acid yield(76.80%),over 272.80 and 19.21 times higher than that of bare ZnS(0.05 mmol h^(-1)g^(-1))and CdS(0.71 mmol h^(-1)g^(-1))in H_(2)generation,respectively.The marigold-like morphology provides abundant active sites and sufficient substrates accessibility for the photocatalyst,while the specific role of the homojunction formed by hexagonal wurtzite(WZ)and cubic zinc blende(ZB)in photoreforming biomass has been demonstrated by density functional theory(DFT)calculations.Glucose is converted to lactic acid on the WZ surface of Zn_(0.3)Cd_(0.7)S via the photoactive species·O_(2)^(-),while the H_(2)is evolved from protons(H^(+))in H_(2)O on the ZB surface of Zn_(0.3)Cd_(0.7)S.This work paves a promising road for the production of sustainable energy and products by integrating photocatalysis and biorefine. 展开更多
关键词 Zn_(x)cd_(1-x)S homojunction Selective glucose photoreforming Biomass valorization Sustainable H_(2) Photoreforming mechanism
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Effect of concentration of cadmium sulfate solution on structural,optical and electric properties of Cd_(1-x)Zn_(x)S thin films 被引量:4
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作者 Yuming Xue Shipeng Zhang +4 位作者 Dianyou Song Liming Zhang Xinyu Wang Lang Wang Hang Sun 《Journal of Semiconductors》 EI CAS CSCD 2021年第11期26-31,共6页
Cd_(1-x)Zn_(x)S thin films were deposited by chemical bath deposition(CBD)on the glass substrate to study the influence of cadmium sulfate concentration on the structural characteristics of the thin film.The SEM resul... Cd_(1-x)Zn_(x)S thin films were deposited by chemical bath deposition(CBD)on the glass substrate to study the influence of cadmium sulfate concentration on the structural characteristics of the thin film.The SEM results show that the thin film surfaces under the cadmium sulfate concentration of 0.005 M exhibit better compactness and uniformity.The distribution diagrams of thin film elements illustrate the film growth rate changes on the trend of the increase,decrease,and increase with the increase of cadmium sulfate concentration.XRD studies exhibit the crystal structure of the film is the hexagonal phase,and there are obvious diffraction peaks and better crystallinity when the concentration is 0.005 M.Spectrophotometer test results demonstrate that the relationship between zinc content x and optical band gap value E_(g) can be expressed by the equation E_(g)(x)=0.59x^(2)+0.69x+2.43.Increasing the zinc content can increase the optical band gap,and the absorbance of the thin film can be improved by decreasing the cadmium sulfate concentration,however,all of them have good transmittance.At a concentration of 0.005 M,the thin film has good absorbance in the 300-800 nm range,80%transmittance,and band gap value of 3.24 eV,which is suitable for use as a buffer layer for solar cells. 展开更多
关键词 CIGS thin film solar cell CBD(chemical bath deposition) buffer layer cd_(1-x)Zn_(x)S thin films cadmium sulfate
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S vacancy modulated Zn_(x)Cd_(1-x)S/CoP quantum dots for efficient H_(2) evolution from water splitting under visible light 被引量:1
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作者 Qi Xie Min Wang +5 位作者 Yong Xu Xiaoke Li Xin Zhou Liang Hong Luhua Jiang Wen-Feng Lin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第10期210-218,I0007,共10页
Energy band structure and interfacial compatibility of heterojunctions are crucial for photocatalysts in promoting photogene rated charge separation and transfer.Here,a combined strategy of vacancy engineering and qua... Energy band structure and interfacial compatibility of heterojunctions are crucial for photocatalysts in promoting photogene rated charge separation and transfer.Here,a combined strategy of vacancy engineering and quantum effect via a facile phosphating process is reported,for the first time,to modulate the energy band structure and the interface of Zn_(x)Cd_(1-x)S/CoP quantum dots(ZCS_(v)/CoP QDs)heterojunction.The combined experimental and theoretical investigation revealed that phosphating process transformed CoO_(x) QDs to CoP QDs,and more importantly,generated considerable amount of sulfur vacancies in ZCS_(v).As a result,a TypeⅡZCS_(v)/CoP QDs heterojunction with compatible interfaces was constructed via in-situ generated P-Zn,P-Cd and S-Co bonds,which facilitated the separation and transfer of the photogenerated charge and thus resulted in a high ability towards hydrogen evolution under visible light(17.53 mmol g^(-1) h^(-1)).This work provides an effective and adaptable strategy to modulate band structure and interfacial compatibility of heterojunctions via vacancy engineering and quantum effect. 展开更多
关键词 Visible light excited photocatalyst Heterojunction Zn_(x)cd_(1-x)S/CoP quantum dot S vacancy engineering Photocatalytic hydrogen evolution
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Zn_(x)Cd_(1-x)S光催化降解垃圾渗滤液及其产氢性能研究 被引量:2
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作者 张腾 蒋灶 +2 位作者 杨政鑫 徐龙君 刘成伦 《燃料化学学报》 EI CAS CSCD 北大核心 2022年第10期1299-1306,共8页
采用共沉淀法在常温下合成了具有高光催化活性的Zn_(x)Cd_(1-x)S固溶体光催化剂,研究了其在模拟光下降解垃圾渗滤液(LFL)的最佳工艺条件和光催化分解废水的产氢性能,以及Zn原子含量、光催化剂的投入量和光照时间对LFL中COD去除率及产氢... 采用共沉淀法在常温下合成了具有高光催化活性的Zn_(x)Cd_(1-x)S固溶体光催化剂,研究了其在模拟光下降解垃圾渗滤液(LFL)的最佳工艺条件和光催化分解废水的产氢性能,以及Zn原子含量、光催化剂的投入量和光照时间对LFL中COD去除率及产氢速率的影响。结果表明,当Zn∶Cd=1∶1时,Zn_(x)Cd_(1-x)S光催化剂的降解及产氢性能最优;在常温条件下,Zn_(0.5)Cd_(0.5)S投入量为1.0 g/L,光照3 h时,渗滤液中COD的去除率最高可达30.85%。使用Zn_(0.5)Cd_(0.5)S对降解后的垃圾渗滤液进行光催化分解产氢,当投入量为0.6 g/L,光照3 h的产氢量为1533μmol,产氢速率可达8312μmol/(g·h),明显高于光催化分解纯水制氢的产氢量;经过三次产氢循环后,其产氢量仍能保持在初始产氢量的83%以上。 展开更多
关键词 Zn_(x)cd_(1-x)S 光催化剂 垃圾渗滤液 降解 产氢
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快速热压制备(AgSbTe_2)_x(Pb_(0.5)Sn_(0.5)Te)_(1-x)半导体材料及热电性能研究 被引量:2
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作者 辛星亮 蒋阳 +1 位作者 仲洪海 余大斌 《粉末冶金材料科学与工程》 EI 2009年第4期244-249,共6页
为了进一步提高PbTe系列合金的热电性能和降低生产成本,采用溶剂热反应合成平均粒度为500nm的PbTe粉末,以所合成的PbTe粉末为主要原料通过封管熔炼法制备(AgSbTe2)x(Pb0.5Sn0.5Te)1-x(x=0,0.05,0.1,0.15,0.2)系合金。所得合金锭经过高... 为了进一步提高PbTe系列合金的热电性能和降低生产成本,采用溶剂热反应合成平均粒度为500nm的PbTe粉末,以所合成的PbTe粉末为主要原料通过封管熔炼法制备(AgSbTe2)x(Pb0.5Sn0.5Te)1-x(x=0,0.05,0.1,0.15,0.2)系合金。所得合金锭经过高能球磨制成微米级的超细合金粉,再通过快速热压烧结制备测试用的多晶试样,所有试样的相对密度均达到90%以上。通过XRD和SEM等手段分析材料的物相组成和微观结构,研究x的变化对于该体系材料热电性能(电阻率、Seebeck系数、热导率和ZT值)的影响。研究表明,当x取值为0.1时该体系材料的热电性能得到最优化,在575K时取得最大的ZT值为1.093。 展开更多
关键词 溶剂热合成 快速热压烧结 (AgSbte2)x(Pb0.5Sn0.5te)1-x
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Zn_(x)Cd_(1-x)S的共沉淀法制备及其光催化活性研究 被引量:1
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作者 蒋灶 吴廷增 +1 位作者 徐龙君 刘成伦 《太阳能学报》 EI CAS CSCD 北大核心 2022年第5期105-112,共8页
利用共沉淀一步法在常温下合成具有高光催化活性的Zn_(x)Cd_(1-x)S固溶体光催化剂,用XRD、SEM、XPS、BET、UV-VIS DRS和PL对制备出的Zn_(x)Cd_(1-x)S样品进行结构和光学性能的表征,并在模拟太阳光照射下对罗丹明B(RhB)溶液进行降解,评... 利用共沉淀一步法在常温下合成具有高光催化活性的Zn_(x)Cd_(1-x)S固溶体光催化剂,用XRD、SEM、XPS、BET、UV-VIS DRS和PL对制备出的Zn_(x)Cd_(1-x)S样品进行结构和光学性能的表征,并在模拟太阳光照射下对罗丹明B(RhB)溶液进行降解,评价其光催化活性。结果表明,Zn_(x)Cd_(1-x)S对可见光的吸收阀值随Zn含量增加而减少,禁带宽度随之增大;颗粒状Zn_(x)Cd_(1-x)S固溶体对罗丹明B具有较高的光催化活性,其中Zn0.8Cd0.2S的光催化性能最优,在90 min内对RhB的降解率达到98.5%,远高于CdS和ZnS光催化剂;经过4次重复使用后,Zn0.8Cd0.2S对RhB的降解率维持在75%以上。Zn0.8Cd0.2S的比表面积和孔隙体积相对于CdS分别增至154.6 m^(2)/g和0.40 cm^(3)/g,其光催化活性显著增强的主要原因是由于其较高的光生电子空穴对的分离效率及较低的复合率。 展开更多
关键词 共沉淀 罗丹明B 降解 Zn_(x)cd_(1-x)S 光催化活性
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垂直布里奇曼法Cd_(1-x)Mn_(x)Te晶体生长过程的数值模拟与实验研究
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作者 张頔 栾丽君 +3 位作者 李龙 杨禄丰 俞鹏飞 段理 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2023年第7期2540-2548,共9页
为经济高效获得Cd_(1-x)Mn_(x)Te晶体垂直布里奇曼法(vertical Bridgman method,VBM)生长条件,基于有限元软件建立二维有限体积数值模型,模拟了VBM生长Cd_(1-x)Mn_(x)Te的晶体过程;探究坩埚内部熔体的传热、流动以及生长界面变化情况,分... 为经济高效获得Cd_(1-x)Mn_(x)Te晶体垂直布里奇曼法(vertical Bridgman method,VBM)生长条件,基于有限元软件建立二维有限体积数值模型,模拟了VBM生长Cd_(1-x)Mn_(x)Te的晶体过程;探究坩埚内部熔体的传热、流动以及生长界面变化情况,分析5、10和15 K/cm 3种不同温度梯度条件对固液界面的影响。结果表明,晶体生长初期,固液界面径向流速差较大,从而使生长界面略凹向晶体;随着晶体生长的进行,固液界面逐渐平缓,开始有利于良好晶体的生长;在生长中后期,固液界面变为凸面,随着温度梯度的增大,可以更好地抑制对流,有利于获得高质量晶体。在模拟结果的基础上,调整不同阶段坩埚下降速度,进行Cd_(0.9)Mn_(0.1)Te晶体的制备,成功地生长出质量良好的Cd_(0.9)Mn_(0.1)Te晶体。 展开更多
关键词 垂直布里奇曼法 cd_(1-x)Mn_(x)te晶体 有限体积 温度梯度 熔体流动
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Controlled synthesis of Mn_(x)Cd_(1-x)S for enhanced visible-light driven photocatalytic hydrogen evolution 被引量:2
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作者 Yuxin Sun Ye Li +4 位作者 Jiajia He Liuyun Chen Hongbing Ji Zuzeng Qin Tongming Su 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2023年第8期37-46,共10页
Ternary sulfide solid solutions have garnered great attention in photocatalytic water splitting due to their tunable electronic property,low cost,and sufficient light-absorption performance.Herein,a series of Mn_(x)Cd... Ternary sulfide solid solutions have garnered great attention in photocatalytic water splitting due to their tunable electronic property,low cost,and sufficient light-absorption performance.Herein,a series of Mn_(x)Cd_(1-x)S samples with different Mn/Cd molar ratios were synthesized by solvothermal method and used for photocatalytic hydrogen production under visible light.The Mn_(0.2)Cd_(0.8)S and Mn_(0.4)Cd_(0.6)S are demonstrated to be the solid so-lutions,while Mn_(0.6)Cd_(0.4)S and Mn_(0.8)Cd_(0.2)S consist of Mn_(x)Cd_(1-x)S solid solution and MnS.In addition,the Mn_(0.4)Cd_(0.6)S exhibits the highest photocatalytic performance with the H_(2) production rate of 185.95μmol·h^(-1),which is 4.7 times higher than that of CdS.Without cocatalyst,the quantum efficiency of Mn_(0.4)Cd_(0.6)S reaches 2.04%at 400 nm.In addition,the Mn_(0.4)Cd_(0.6)S solid solution also shows high stability during the photocatalytic H_(2) production reaction.The effect of Mn/Cd molar ratio on the microstructure,band gap structure,and photo-catalytic hydrogen production performance of Mn_(x)Cd_(1-x)S was revealed systematically.The excellent photo-catalytic H_(2) production performance of Mn_(0.4)Cd_(0.6)S solid solution is mainly due to its enhanced reducing potential and high charge separation efficiency. 展开更多
关键词 Mn_(x)cd_(1-x)S Solid solution PHOTOCATALYTIC Water splitting Hydrogen
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室温Cd_(x)Zn_(1-x)Te/ZnTe多量子阱光学双稳态的研究
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作者 栗红玉 申德振 +3 位作者 张吉英 林久令 杨宝均 范希武 《光学学报》 EI CAS CSCD 北大核心 1997年第12期1630-1633,共4页
研制了室温CdxZn1-xTe/ZnTe多量子阱法布里-珀罗(F-P)腔光双稳器件,并在该器件上观察到皮秒量级的室温激子光双稳。研究结果表明,CdxZn1-xTe/ZnTe多量子阱光双稳器件的光双稳阈值和对比度分别为... 研制了室温CdxZn1-xTe/ZnTe多量子阱法布里-珀罗(F-P)腔光双稳器件,并在该器件上观察到皮秒量级的室温激子光双稳。研究结果表明,CdxZn1-xTe/ZnTe多量子阱光双稳器件的光双稳阈值和对比度分别为363kW/cm2和41。根据CdxZn1-xTe/ZnTe多量子阱的吸收谱和激子非线性理论,归结CdxZn1-xTe/ZnTe多量子阱光双稳的主要非线性机理为激子的饱和吸收。 展开更多
关键词 cd_(x)Zn_(1-x)te/Znte多量子阱 光双稳器件 激子吸收
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Unique hollow heterostructured CdS/Cd_(0.5)Zn_(0.5)S-Mo_(1-x)W_(x)S_(2):Highly-improved visible-light-driven H_(2) generation via synergy of Cd_(0.5)Zn_(0.5)S protective shell and defect-rich Mo_(1-x)W_(x)S_(2) cocatalyst
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作者 Wenjing Wang Hanchu Chen +6 位作者 Jiakun Wu Hui Wang Shaoxiang Li Bo Wang Yanyan Li Haifeng Lin Lei Wang 《Nano Research》 SCIE EI CSCD 2022年第2期985-995,共11页
Photocatalytic water splitting for hydrogen(H_(2))production is a green sustainable technology,in which highly-efficient steady photocatalysts are fundamentally required.In this work,unique CdS/Cd_(0.5)Zn_(0.5)S-M0_(1... Photocatalytic water splitting for hydrogen(H_(2))production is a green sustainable technology,in which highly-efficient steady photocatalysts are fundamentally required.In this work,unique CdS/Cd_(0.5)Zn_(0.5)S-M0_(1-x)W_(x)S_(2) photocatalyst constructed by CdS hollow nano-spheres with successively surface-modified Cd_(0.5)Zn_(0.5)S shell and defect-rich MO_(1-x)W_(x)S_(2) ultrathin nanosheets was reported for the first time.Interestingly,the Cd_(0.5)Zn_(0.5)S shell could greatly enhance the photo-stability and reduce the carrier recombination of CdS.Meanwhile,enriching active sites and accelerating charge transfer could be achieved via anchoring defect-rich Mo_(1-x)W_(x)S_(2) onto CdS/Cd_(0.5)Zn_(0.5)S hollow heterostructures.Specifically,the optimized CdS/Cd_(0.5)Zn_(0.5)S-Mo_(1-x)W_(x)Sa(6 h Cd_(0.5)Zn_(0.5)S-coating,7 wt.%Mo_(1-x)W_(x)S_(2),x=0.5)hybrid delivered an exceptional H_(2) generation rate of 215.99 mmol·g^(-1)·h^(-1),which is approximately 502,134,and 23 times that of pure CdS,CdS/Cd_(0.5)Zn_(0.5)S,and 3 wt.%Pt-loaded CdS/Cd_(0.5)Zn_(0.5)S,respectively.Remarkably,a high H_(2) evolution reaction(HER)apparent quantum yield(AQY)of 64.81%was obtained under 420-nm irradiation.In addition,the CdS/Cd_(0.5)Zn_(0.5)S-Mo_(1-x)W_(x)S_(2) was also durable for H2 production under long-term irradiation.This work provides valuable inspirations to rational design and synthesis of efficient and stable hybrid photocatalysts for solar energy conversion. 展开更多
关键词 cdS hollow nano-spheres cd_(0.5)Zn_(0.5)S protective shells defect-rich Mo_(1-x)W_(x)S_(2)nanosheets cocatalysts photocatalytic H_(2)evolution
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Dramatically Enhanced Visible-light-responsive H_(2) Evolution of Cd_(1-x)Zn_(x)S via the Synergistic Effect of Ni_(2)P and 1T/2H MoS_(2) Cocatalysts 被引量:7
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作者 MA Xiao-Wei LIN Hai-Feng +3 位作者 LI Yan-Yan WANG Lei PU Xi-Peng YI Xiu-Jie 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2021年第1期7-22,1,共17页
Photocatalytic hydrogen generation from water-splitting holds huge promise for resolving the current energy shortage and environmental issues.Nevertheless,it is still challenging so far to develop non-noble-metal phot... Photocatalytic hydrogen generation from water-splitting holds huge promise for resolving the current energy shortage and environmental issues.Nevertheless,it is still challenging so far to develop non-noble-metal photocatalysts which are efficient toward solar-powered hydrogen evolution reaction(HER).In this work,through an ultrasonic water-bath strategy combined with solvothermal and electrostatic assembly processes,we obtain homogeneous Cd_(1-x)Zn_(x)S–Ni_(2)P–MoS_(2) hybrid nano-spheres consisting of Cd_(1-x)Zn_(x)S solid solutions decorated by Ni_(2)P and 1 T/2 H MoS_(2) cocatalysts,which demonstrate excellent activity and stability for visible-light-responsive(λ>420 nm)H_(2) production.Specifically,the Cd_(1-x)Zn_(x)S-Ni_(2)P-MoS_(2) nano-spheres with 2 wt%Ni_(2)P and 0.2 wt%MoS_(2)(CZ_(0.7)S–2 N–0.2 M)exhibit the optimal HER activity of 55.77 mmol·g^(-1)·h^(-1),about 47 and 32 times more than that of CZ_(0.7)S and Pt–CZ_(0.7)S,respectively.The outstanding HER performance of Cd_(1-x)Zn_(x)S–Ni_(2)P–MoS_(2) can be ascribed to the presence of abundant HER active sites in Ni2 P nanoparticles and 1 T/2 H MoS_(2) nanosheets as well as the effective transfer and separation of charge carriers.Moreover,the coupling sequence of cocatalysts in Cd_(1-x)Zn_(x)S–Ni_(2)P–MoS_(2) is found to be critical in the regulation of charge transfer pathways and thus the resultant photocatalytic efficiency.The results displayed here could facilitate the engineering of high-performance photocatalysts employing multi-component cocatalysts for sustainable solar-to-fuel conversion. 展开更多
关键词 uniform cd_(1-x)Zn_(x)S-Ni_(2)P-MoS_(2)nano-spheres MoS_(2)with 1T/2H mixed-phases photocatalytic H_(2)evolution charge transfer pathways active sites
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In掺杂对PbTe薄膜结构及电输运特性影响
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作者 徐珊瑚 郑春波 +6 位作者 蒋磊 陈忠兰 周丹 朱希 斯剑霄 廖清 吴海飞 《现代物理》 2017年第6期249-256,共8页
本文采用分子束外延(MBE)方法在BaF2(111)衬底上外延生长了Pb1-xInxTe (0.00 ≤ x ≤ 0.20)薄膜。研究结果表明当x ≤ 0.06时,In在PbTe中进行替位式掺杂,形成n型的立方相Pb1?xInxTe结构,薄膜电导率随In掺杂量的增加而增大;当x ≥ 0.10时... 本文采用分子束外延(MBE)方法在BaF2(111)衬底上外延生长了Pb1-xInxTe (0.00 ≤ x ≤ 0.20)薄膜。研究结果表明当x ≤ 0.06时,In在PbTe中进行替位式掺杂,形成n型的立方相Pb1?xInxTe结构,薄膜电导率随In掺杂量的增加而增大;当x ≥ 0.10时,In掺杂出现过饱和,过量的In形成In2Te3结构相,Pb1-xInxTe薄膜电导率急剧下降。整个掺杂过程中,In均向薄膜表面发生了偏析。综合分析不同In掺杂量下Pb1-xInxTe薄膜的Seebeck系数和电导率测试结果,可以得出In的微量掺杂可实现PbTe薄膜电输运性能的提升,In掺杂量为0.06时薄膜表现出最佳的电输运性能,440K时Pb1-xInxTe (x = 0.06)的功率因子可达9.7 μW-cm-1`K-2,为本征PbTe最大功率因子的1.2倍。 展开更多
关键词 热电材料 Pb1_(1-x)In_(x)te 分子束外延
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拼接型短波红外探测器的光谱响应特性
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作者 廖清君 胡晓宁 +3 位作者 黄爱波 陈洪雷 叶振华 丁瑞军 《红外与激光工程》 EI CSCD 北大核心 2023年第9期65-72,共8页
红外探测器的光谱响应一致性影响高光谱成像仪器的动态范围,研究高光谱成像用拼接型短波红外探测器在同一光谱维的响应均匀性对提高高光谱成像性能有重要意义。通过测量相对光谱响应和窄带响应,对响应波段为1.0~2.5μm、规格为2000×... 红外探测器的光谱响应一致性影响高光谱成像仪器的动态范围,研究高光谱成像用拼接型短波红外探测器在同一光谱维的响应均匀性对提高高光谱成像性能有重要意义。通过测量相对光谱响应和窄带响应,对响应波段为1.0~2.5μm、规格为2000×256的碲镉汞短波红外探测器光谱响应率进行测量和分析,提出用光谱响应非均匀性定量化分析光谱响应一致性。分析了在80℃和140℃不同的黑体温度下,窄带滤光片的中心波长和半带宽不同时,带外截止深度为OD3时,带外信号对窄带性能测试误差的影响。通过测量探测器模块的光谱响应率,计算拼接的2000×256探测器在1μm、1.9μm和2.5μm处的响应非均匀性分别为6.23%、6.06%和4.07%。光谱响应率的准确测量实现了拼接型短波红外探测器的光谱响应一致性的定量化评价,有利于探测器在高光谱成像中的合理应用。 展开更多
关键词 高光谱成像 光谱响应 定量化分析 短波红外探测器 碲镉汞
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Cd饱和气氛退火对碲锌镉晶体导电类型转变界面的影响 被引量:1
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作者 袁绶章 赵文 +3 位作者 孔金丞 姜军 赵增林 姬荣斌 《红外技术》 CSCD 北大核心 2021年第6期517-522,共6页
在富Te生长条件下,通过垂直布里奇曼法制备的部分碲锌镉晶体内存在导电类型转变界面。采用富Te液相外延技术在含有导电类型转变界面的碲锌镉衬底上生长碲镉汞薄膜,制成的红外焦平面探测器响应图上存在明显的响应不均匀分界面。碲锌镉晶... 在富Te生长条件下,通过垂直布里奇曼法制备的部分碲锌镉晶体内存在导电类型转变界面。采用富Te液相外延技术在含有导电类型转变界面的碲锌镉衬底上生长碲镉汞薄膜,制成的红外焦平面探测器响应图上存在明显的响应不均匀分界面。碲锌镉晶体的导电类型转变由缺陷类型的不同引起,为消除碲锌镉衬底的导电类型转变界面,提升碲镉汞红外焦平面的成像质量,对含有导电类型转变界面的碲锌镉晶体进行了Cd饱和气氛退火实验,研究了时间和温度等退火条件对晶体导电类型转变界面的影响,探讨了Cd间隙和Cd空位缺陷的形成机制,为晶体生长过程中的Cd空位缺陷抑制提出了解决思路。 展开更多
关键词 碲锌镉 导电类型转变界面 退火 cd
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Ga-Cd-O的电子结构和光学性质的第一性原理计算
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作者 张法碧 苗国斌 +2 位作者 张荣辉 周娟 周飞 《桂林电子科技大学学报》 2022年第2期87-94,共8页
采用基于密度泛函理论的第一性原理计算方法,研究了Cd掺杂对β-Ga_(2)O_(3)物理性能的影响。通过建立β-Ga_(2)O_(3)模型,用Cd原子替代部分的Ga原子后构建了不同Cd掺杂量模型(Cd_(x)Ga_(1-x))_(2)O_(3)(x=12.5%、25%、50%),然后对不同... 采用基于密度泛函理论的第一性原理计算方法,研究了Cd掺杂对β-Ga_(2)O_(3)物理性能的影响。通过建立β-Ga_(2)O_(3)模型,用Cd原子替代部分的Ga原子后构建了不同Cd掺杂量模型(Cd_(x)Ga_(1-x))_(2)O_(3)(x=12.5%、25%、50%),然后对不同的掺杂模型进行了几何结构优化,获得了稳定的晶格结构和晶格参数,并对它们的能带结构、态密度以及光学性质等进行了分析。计算结果表明,Cd掺杂会导致β-Ga_(2)O_(3)晶胞体积增大,稳定性减小。随着Cd掺杂浓度的增加,(Cd_(x)Ga_(1-x))_(2)O_(3)体系的带隙表现出先减小后增大的趋势;并且随着Cd掺杂量的不同(12.5%、25%、50%),掺杂体系(Cd_(x)Ga_(1-x))_(2)O_(3)的材料性质发生了变化,由β-Ga_(2)O_(3)的间接带隙材料先变为直接带隙材料(Cd浓度为12.5%、25%),然后又变回到间接带隙材料(Cd浓度为50%)。此外,掺入Cd后降低了体系在一定能量范围内(6~25 eV)的吸收系数和反射率,从而提高了透光率。以上研究表明,选择合适的掺杂浓度可以实现光电性质丰富可调的(Cd_(x)Ga_(1-x))_(2)O_(3)合金材料。 展开更多
关键词 第一性原理 能带结构 光电性质 (cd_(x)Ga_(1-x))_(2)O_(3)合金 β-Ga_(2)O_(3)
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