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电化学生长纳米枝状ZnO及其场发射性能研究 被引量:4
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作者 叶芸 康冬茹 +3 位作者 汪江胜 吕珊红 杨兰 郭太良 《纳米技术与精密工程》 CAS CSCD 北大核心 2017年第1期1-6,共6页
采用电化学沉积法在阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的作用下生长纳米枝状氧化锌(ZnO),通过扫描电子显微镜(SEM)、X射线衍射(XRD)和场发射测试,系统研究了不同沉积时间下纳米枝状ZnO的形貌、结构与场发射性能.研究结果表明:由... 采用电化学沉积法在阴离子表面活性剂十二烷基苯磺酸钠(SDBS)的作用下生长纳米枝状氧化锌(ZnO),通过扫描电子显微镜(SEM)、X射线衍射(XRD)和场发射测试,系统研究了不同沉积时间下纳米枝状ZnO的形貌、结构与场发射性能.研究结果表明:由于表面活性剂中阴离子的位阻效应,导致在ZnO主干上电化学生长了多个ZnO的分枝,并且纳米枝状ZnO的场发射性能随着沉积时间的增加出现先升高后降低的趋势.其场发射性能的提高主要取决于ZnO主干上分枝的形貌和密度,在沉积时间为90 min时,每支ZnO的主干上分别生长了约2~10个分枝,获得最佳的纳米枝状ZnO场发射性能,开启场强低至1.54 V/μm,场增强因子高达59 739. 展开更多
关键词 电化学生长 纳米枝状ZnO 场发射 场增强因子
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电化学方法生长有序纳米柱阵列的发光性质(英文)
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作者 刘枫 李金华 《液晶与显示》 CAS CSCD 北大核心 2008年第6期658-662,共5页
采用电化学方法在磁控溅射方法生长的ZnO薄膜上生长垂直于衬底排列的ZnO纳米柱。ZnO薄膜的作用主要是为ZnO纳米柱的生长提供同质外延层。电化学生长的ZnO纳米柱具有良好的晶体质量和发光性能。通过研究其变温发光光谱可以确定其紫外发... 采用电化学方法在磁控溅射方法生长的ZnO薄膜上生长垂直于衬底排列的ZnO纳米柱。ZnO薄膜的作用主要是为ZnO纳米柱的生长提供同质外延层。电化学生长的ZnO纳米柱具有良好的晶体质量和发光性能。通过研究其变温发光光谱可以确定其紫外发光峰来自于带边激子的辐射复合。此种方法生长的ZnO纳米柱在场发射显示、蓝紫色和白光发光二极管方面有潜在的应用前景。 展开更多
关键词 ZNO 磁控溅射 电化学生长 光致发光
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杂多酸-聚(二烯丙基二甲基氯化铵)多层膜在4-氨基硫酚修饰金电极上的组装和电化学行为 被引量:3
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作者 黄正国 程龙 +2 位作者 孙勤枢 刘柏峰 董绍俊 《分析化学》 SCIE EI CAS CSCD 北大核心 2000年第11期1331-1335,共5页
通过电化学生长法在 4 氨基硫酚自组装膜修饰金电极上制备了包含杂多酸 (SiMo11VO5-4 0 和聚合物阳离子PDDA的多层膜修饰电极。用循环伏安法研究了该多层膜的电化学行为 ,结果表明Mo的第 3个还原峰随多层膜层数的增加显著增长 ,而另两... 通过电化学生长法在 4 氨基硫酚自组装膜修饰金电极上制备了包含杂多酸 (SiMo11VO5-4 0 和聚合物阳离子PDDA的多层膜修饰电极。用循环伏安法研究了该多层膜的电化学行为 ,结果表明Mo的第 3个还原峰随多层膜层数的增加显著增长 ,而另两个还原峰增长缓慢。该修饰电极的峰电位随pH的增加而线性负移 ,表明有氢离子参与杂多酸的氧化还原反应。该修饰电极对BrO-3 和HNO2 的还原反应有良好的催化作用 ,催化电流随着层数的增加而增长 ,并且Mo的第三个还原峰电流与CBrO-3 有良好的线性关系。 展开更多
关键词 电化学生长 杂多酸 PDDA 多层膜修饰金电极
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杂多酸-PDDA多层膜在4-ATP修饰金电极上的电化学性质 被引量:1
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作者 黄正国 孙勤枢 +2 位作者 程龙 刘柏峰 董绍俊 《济宁医学院学报》 2001年第1期24-26,共3页
目的 制备包含杂多酸 (SiMo11VO4 05-和Pr(SiMo7W4 O4 05-) )和聚合物阳离子PDDA的多层膜修饰电极 ,研究其电化学行为。方法 利用电化学生长法制备多层膜修饰电极 ,并用循环伏安法研究其电化学行为。结果 Mo的第三个还原峰随多层膜... 目的 制备包含杂多酸 (SiMo11VO4 05-和Pr(SiMo7W4 O4 05-) )和聚合物阳离子PDDA的多层膜修饰电极 ,研究其电化学行为。方法 利用电化学生长法制备多层膜修饰电极 ,并用循环伏安法研究其电化学行为。结果 Mo的第三个还原峰随多层膜层数的增加显著增长 ,而另两个还原峰增长缓慢甚至不增长。多层膜修饰电极的峰电位随pH的增加而线性负移。结论 该多层膜的电化学性质不同于以往制备的多层膜 。 展开更多
关键词 电化学生长 多层膜 电催化 杂多酸 PDDA 金电极 修饰电极
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A Comparison between CPP-GMR in Multilayer Nanowires and CIP-GMR in Multilayer Thin Films in Electrochemically Growth Ni-Cu/Cu Systems
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作者 Jafari Fesharaki Marjaneh Nabiyouni Gholamreza 《材料科学与工程(中英文B版)》 2011年第5期597-602,共6页
关键词 多层纳米线 多层薄膜 电化学生长 U系统 扫描电子显微镜 元件 聚碳酸酯膜 电阻率测量
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锂离子电池Sn-Co-Zn合金负极材料电沉积及其储锂性能 被引量:7
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作者 常玉清 黄令 孙世刚 《物理化学学报》 SCIE CAS CSCD 北大核心 2010年第3期561-566,共6页
运用电沉积技术制备出Sn-Co-Zn合金电极材料.采用X射线衍射(XRD)和扫描电子显微镜(SEM)分析了该合金材料的相结构和表面形貌.通过循环伏安和电位阶跃实验研究了Sn-Co-Zn合金的电沉积机理,实验表明,Sn-Co-Zn合金电沉积按扩散控制连续成... 运用电沉积技术制备出Sn-Co-Zn合金电极材料.采用X射线衍射(XRD)和扫描电子显微镜(SEM)分析了该合金材料的相结构和表面形貌.通过循环伏安和电位阶跃实验研究了Sn-Co-Zn合金的电沉积机理,实验表明,Sn-Co-Zn合金电沉积按扩散控制连续成核和三维生长方式进行.XRD结果表明,该合金由CoSn3、Co3Sn2和Zn组成.电化学性能测试表明:Sn-Co-Zn合金电极首次放电(脱锂)容量达751mAh·g-1,首次循环的库仑效率为88%;30周循环之后放电容量为510mAh·g-1.该Sn-Co-Zn合金电极良好的电化学储锂性能可能归因于材料的多相结构. 展开更多
关键词 锂离子电池 负极 Sn-Co-Zn合金电极 电沉积 电化学成核与生长
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Preparation and performance of 3D-Pb anodes for nonferrous metals electrowinning in H2SO4 aqueous solution 被引量:2
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作者 Xiao-cong ZHONG Bin ZHANG +3 位作者 Zhen-cong LIN Jia-ming LIU Yong-min XIE Zhi-feng XU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第2期535-547,共13页
The effects of Pb^2+concentration,current density,deposition time and temperature on Pb deposit structure were investigated.In lower Pb^2+concentration(~0.15 mol/L),carambola-like 3D-Pb structure was constructed,while... The effects of Pb^2+concentration,current density,deposition time and temperature on Pb deposit structure were investigated.In lower Pb^2+concentration(~0.15 mol/L),carambola-like 3D-Pb structure was constructed,while in higher Pb2+concentration(≥0.30 mol/L),Pb deposits exhibited pyramid-like structure.Furthermore,the oxide layer and anodic potential of carambola-shaped 3D-Pb(Cara-Pb)and pyramid-shaped 3D-Pb(Pyra-Pb)anodes were investigated and compared with those of fresh Pb anode.After 72 h galvanostatic electrolysis(50 mA/cm2)in 160 g/L H2SO4 solution,the oxide layer on Pyra-Pb was much thicker than that on Cara-Pb and Pb anodes,which remarkably relieved intercrystalline corrosion of the metallic substrate.Additionally,the oxide layer on Pyra-Pb anode presented a larger surface area and higher PbO2 content.Hence,Pyra-Pb anode showed a 40 m V lower anodic potential compared to Cara-Pb and Pb anodes.In sum,Pyra-Pb anode had a potential to decrease energy consumption and prolong the life span of traditional Pb anode. 展开更多
关键词 electrochemical deposition 3D-Pb structure growth mechanism oxide layer anodic potential
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Television as Popular Culture Media and Parental Attention and Their Correlation to the Students' Motivation to Choose Major
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作者 Sudiran 《Sino-US English Teaching》 2015年第5期387-396,共10页
Television as one of the popular culture media plays an important role in the development of students' personality and knowledge because it provides countless information and entertainment that can enhance their know... Television as one of the popular culture media plays an important role in the development of students' personality and knowledge because it provides countless information and entertainment that can enhance their knowledge as the viewers. This study was conducted to give an idea whether television viewing and parental attention can assist students to take a decision of choosing major at the senior high school. This study used descriptive method which analyzed the correlation among television viewing, parental attention, and the students' motivation to choose a major. The sample of this study consisted of 100 students of the state senior high school in Malang, East Java. The finding shows that there is no correlation among television viewing, parental attention, and the students' motivation to choose major at the senior high school. In other words, the possibility of choosing the major can be attributed to some other factors such as interest, talent, aspiration, and other expectation to achieve their goals 展开更多
关键词 TELEVISION popular culture media parental attention students MOTIVATION
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Vacuum deposited film growth,morphology and interfacial electronic structures of 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene(C8-BTBT)
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作者 WEI Jun-hua NIU Dong-mei GAO Yong-li 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第4期1041-1061,共21页
Interfaces play critical roles in electronic devices and provide great diversity of film morphology and device performance.We retrospect the substrate mediated vacuum film growth of benchmark high mobility material 2,... Interfaces play critical roles in electronic devices and provide great diversity of film morphology and device performance.We retrospect the substrate mediated vacuum film growth of benchmark high mobility material 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene(C8-BTBT)and the interface electronic structures.The film growth of C8-BTBT molecules is diversified depending on the substrate-molecule and molecule-molecule interactions.On atomic smooth substrates C8-BTBT film grows in layer-by-layer mode while on coarse substrate it grows in islands mode.The initial molecular layer at dielectric,semiconductor and conductive substrates displays slight different lattice structure.The initial molecule orientation depends on the substrate and will gradually change to standing up configuration as in bulk phase.C8-BTBT behaves as electron donor when contacting with dielectric and stable conductive materials.This usually induces a dipole layer pointing to C8-BTBT and an upward bend bending in C8-BTBT side toward the interface.Although it is air stable,C8-BTBT is chemically reactive with some transition metals and compounds.The orientation change from lying down to standing up in the film usually leads to decrease of ionization potential.The article provides insights to the interface physical and chemical processes and suggestions for optimal design and fabrication of C8-BTBT based devices. 展开更多
关键词 interface film morphology packing configuration growth mode electronic structure chemical reaction interface dipole
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三维纳米结构:设计下一代器件
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作者 金娟 《国外科技新书评介》 2012年第6期24-24,共1页
随着纳米技术的发展,科学家们可以通过越来越多的手段设计构造众多形状和功能的三维纳米结构。为了深入地讨论纳米结构的方法和功能,本书分为18章:1.通过自组装构建三维纳米结构器件;2.生物启发的三维纳米结构;3.纳米打印法构... 随着纳米技术的发展,科学家们可以通过越来越多的手段设计构造众多形状和功能的三维纳米结构。为了深入地讨论纳米结构的方法和功能,本书分为18章:1.通过自组装构建三维纳米结构器件;2.生物启发的三维纳米结构;3.纳米打印法构建三维微纳结构;4.纳米结构材料的电化学生长;5.拉丝纳米制造法制备三维微纳结构;6.用于光电化学制氢的一维金属氧化物纳米结构; 展开更多
关键词 纳米结构器件 三维 设计 纳米结构材料 电化学生长 金属氧化物 纳米技术 生物启发
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Pt-induced electrochemical growth of ZnO rods onto reduced graphene oxide for enhanced photodegradation performance 被引量:2
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作者 Xuewen Wang Xiaojie Yao 《Chinese Science Bulletin》 SCIE EI CAS 2014年第18期2208-2213,共6页
Photodegradation of organic pollutants over semiconductor catalysts is considered to be a viable method for wastewater treatment.Of the different semiconductor photocatalysts,ZnO has been widely used for the photodegr... Photodegradation of organic pollutants over semiconductor catalysts is considered to be a viable method for wastewater treatment.Of the different semiconductor photocatalysts,ZnO has been widely used for the photodegradation of organic pollutants.Meanwhile,graphene is being actively investigated as a cocatalyst for such processes.The high carrier transport rate of graphene can favor the transfer of photoexcited electrons,while the increased specific surface area provides adsorption sites for the organic effluent molecules,thereby improving overall photocatalytic activity.Therefore,in this study,Pt–ZnO–reduced graphene oxide(RGO)rods with different RGO contents are synthesize during a novel Pt-induced electrochemical method,where ZnjZnO acts as the anode and PtjH2OjH2acts as the cathode.The photocatalytic degradation activity of the Pt–ZnO–RGO rods is remarkably improved under UV–visible light irradiation,with the optimum loading RGO content of 1 wt%. 展开更多
关键词 氧化锌 氧化物 光降解性能 电化学生长 石墨 诱导 半导体光催化剂 光催化降解
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Bottom-up synthesis of ultrathin straight platinum nanowires: Electric field impact 被引量:3
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作者 Alexander Nerowski Joerg Opitz +1 位作者 Larysa Baraban Gianaurelio Cuniberti 《Nano Research》 SCIE EI CAS CSCD 2013年第5期303-311,共9页
We present a study of the electric field effect on electrochemically grown ultrathin, straight platinum nanowires with minimum diameter of 15 nm and length in the micrometer range, synthesized on a silicon oxide subst... We present a study of the electric field effect on electrochemically grown ultrathin, straight platinum nanowires with minimum diameter of 15 nm and length in the micrometer range, synthesized on a silicon oxide substrate between metal electrodes in H2PtC16 solution. The influence of the concentration of the platinum- containing acid and the frequency of the applied voltage on the diameter of the nanowires is discussed with a corresponding theoretical analysis. We demonstrate for the first time that the electric field profile, provided by the specific geometry of the metal electrodes, dramatically influences the growth and morphology of the nanowires. Finally, we provide guidelines for the controlled fabrication and contacting of straight, ultrathin metal wires, eliminating branching and dendritic growth, which is one of the main shortcomings of the current bottom-up nanotechnology. The proposed concept of self-assembly of thin nanowires, influenced by the electric field, potentially represents a new route for guided nanocontacting via smart design of the electrode geometry. The possible applications reach from nanoelectronics to gas sensors and biosensors. 展开更多
关键词 bottom-up growth directed electrochemicalnanowire assembly(DENA) metal nanowires NANOSTRUCTURING nanoelectronics local electric field
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Shape-controlled Pt nanocubes directly grown on carbon supports and their electrocatalytic activity toward methanol oxidation 被引量:5
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作者 Hee Jin Kim Bibi Ruqia +6 位作者 Mi Sung Kang Su Bin Lim Ran Choi Ki Min Nam Won Seok Seo Gaehang Lee Sang-Il Choi 《Science Bulletin》 SCIE EI CAS CSCD 2017年第13期943-949,共7页
Synthesis of shape-controlled Pt nanocrystals is substantial and important for enhancing chemical and electrochemical reactions.However,the removal of capping agents,shape-controlling chemicals,on Pt surfaces is essen... Synthesis of shape-controlled Pt nanocrystals is substantial and important for enhancing chemical and electrochemical reactions.However,the removal of capping agents,shape-controlling chemicals,on Pt surfaces is essential prior to conducting the catalytic reactions.Here we report a facile one-pot synthesis of Pt nanocubes directly grown on carbon supports(Pt nanocubes/C) with modulating the kinetic reaction factors for shaping the nanocrystals,but without adding any capping agents for preserving the clean Pt surfaces.Well-dispersed Pt nanocubes/C shows enhanced activity and long-term stability toward methanol oxidation reaction compared to the commercial Pt/C catalyst. 展开更多
关键词 Platinum Nanocube Shape-control Kinetic product Methanol oxidation
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Laser tuned field emission of the carbon nanotube arrays grown on an optical fiber 被引量:1
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作者 WEI XianQi LI Xin +1 位作者 LIU WeiHua WANG XiaoLi 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第10期1936-1940,共5页
Laser was coupled into an optical fiber,on which covered a layer of well-aligned carbon nanotubes(CNTs)serving as cathode,to tune the field emission of the cathode.CNT arrays as field emission cathode were synthesized... Laser was coupled into an optical fiber,on which covered a layer of well-aligned carbon nanotubes(CNTs)serving as cathode,to tune the field emission of the cathode.CNT arrays as field emission cathode were synthesized by chemical vapor deposition(CVD)on a naked fiber core.When the laser was coupled into the fiber,the turn-on voltage(Vto at a current density of 1 mA cm?2)decreased from 1.0 to 0.9 kV and the emission current density increased from 0.83 mA cm?2(at a 1 kV bias voltage)to3.04 mA cm?2 on 40μm diameter fiber.A photon absorption mechanism is attributed to the field emission improvement.The estimated effective work function of CNT arrays on the optical fiber decrease from 4.89 to 4.29 eV.The results show the possibility of constructing a waveguide type laser modulated field emission cathode. 展开更多
关键词 LASER field emission carbon nanotubes optical fiber
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Centimeter-scale perovskite SrTaO2N single crystals with enhanced photoelectrochemical performance
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作者 Xiaoming Xu Wenjing Wang +6 位作者 Yuanming Zhang Yong Chen Huiting Huang Tao Fang Yang Li Zhaosheng Li Zhigang Zou 《Science Bulletin》 SCIE EI CAS CSCD 2022年第14期1458-1466,M0004,共10页
Large-scale single crystals have potential applications in many fields,such as in ferroelectric and photoelectric energy conversion devices.Perovskite oxynitrides have also attracted attention in photoelectrochemical ... Large-scale single crystals have potential applications in many fields,such as in ferroelectric and photoelectric energy conversion devices.Perovskite oxynitrides have also attracted attention in photoelectrochemical water splitting systems because of their high theoretical solar-to-hydrogen efficiencies.Nevertheless,the synthesis of perovskite oxynitride single crystals requires the coupling of cation exchange and ammonization processes,which is exceptionally challenging.The present study demonstrates an inorganic vapor method that provides,for the first time ever,high-quality epitaxial perovskite SrTaO_(2)N single crystals on the centimeter scale.Assessments using Raman spectroscopy,crystal structure analysis and density functional theory determined that the conversion mechanism followed a topotactic transition mode.Compared with conventional SrTaO_(2)N particle-assembled films,the SrTaO_(2)N single crystals made in this work were free of interparticle interfaces and grain boundaries,which exhibited extremely high performance during photoelectrochemical water oxidation.In particular,these SrTaO_(2)N single crystals showed the highest photocurrent density at 0.6 V vs.RHE(1.20 mA cm^(−2)) and the highest photocurrent filling factor(47.6%)reported to date,together with a low onset potential(0.35 V vs.RHE).This onset potential was 200 mV less than that of the reported in situ SrTaO_(2)N film,and the photocurrent fill factor was improved by 2 to 3 times. 展开更多
关键词 Perovskite oxynitride Single crystal PHOTOELECTROCHEMISTRY
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Hybrid PdAg alloy-Au nanorods: Controlled growth, optical properties and electrochemical catalysis 被引量:10
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作者 Qiao Zhang Xia Guo +3 位作者 Zhenxing Liang Jianhuang Zeng Jian Yang Shijun Liao 《Nano Research》 SCIE EI CAS CSCD 2013年第8期571-580,共10页
Controllable growth of high-quality hybrid nanostructures is highly desirable for the fabrication of hierarchical, complex and multifunctional devices. Here, PdAg alloys have been controllably grown at different locat... Controllable growth of high-quality hybrid nanostructures is highly desirable for the fabrication of hierarchical, complex and multifunctional devices. Here, PdAg alloys have been controllably grown at different locations on gold nanorods, producing dumbbell-like nanostructures with PdAg at the ends of the gold nanorods or branched nanostructures with PdAg grown almost perpendicular to the gold nanorods. The nucleation sites of PdAg alloys on the gold nanorods can be effectively tuned by varying the concentrations of H2PdC14, AgNO3 and cetyltrimethylammonium bromide (CTAB). The dumbbell-like and branched nanostructures were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), line-scanning energy-dispersive X-ray spectros-copy (EDS), X-ray photoelectron spectroscopy (XPS) and UV-Vis absorption spectroscopy. Their electrocatalytic performance was evaluated using ethanol oxidation as a probe reaction. The dumbbelMike nanostructures show a better anti-poisoning performance, but a worse electrochemical activity than the branched ones. The results provide guidelines for the controlled growth of complicated nanostructures for either fundamental studies or potential applications. 展开更多
关键词 NANOSTRUCTURES hybrid materials METALS controlled growth electrochemical catalysis optical properties
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Large and anisotropic linear magnetoresistance in bulk stoichiometric Cd_3As_2 crystals
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作者 WU DeSheng WANG Xia +4 位作者 ZHANG Xu YANG ChongLi ZHENG Ping LI PeiGang SHI YouGuo 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第1期133-138,共6页
Cd3As2 was recently identified as a novel three-dimensional (3D) topological semimetal hosting the long-pursuing 3D Dirac Fermion. Crystals of Cd3As2 grown preferentially along the [100] and [112] directions were ob... Cd3As2 was recently identified as a novel three-dimensional (3D) topological semimetal hosting the long-pursuing 3D Dirac Fermion. Crystals of Cd3As2 grown preferentially along the [100] and [112] directions were obtained through the modified chemical vapor transfer growth method, thus allowing the examination of transport anisotropy. The resistivity and magnetore- sistance (MR) are basically linear with respect to magnetic field (H) in the measured temperature range of 2-300 K irrespective of the directions. The linear resistivity and MR are significantly anisotropic not only along [100] and [112] directions but also with respect to tilt angle between the growth directions and H, thus providing transport signatures of the 3D Dirac Fermion as well as the possible linear and anisotropic change of Weyl Fermi surface in H. Very large MR along the [100] direction is observed, even approaching 3100% at 2 K and 14 kOe (10e = 79.5775 A m^-l). The results would be helpful in renewing interest in studying emergent phenomena arising from bulk 3D Dirac Fermion as well as in paving the way for Cd3As2 to be used in magnetoelectronic sensors. 展开更多
关键词 topological semimetal linear magnetoresistance transport anisotropy
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