检索结果-内蒙古大学图书馆

Self-powered photoelectrochemical biosensing platform based on Au NPs@ZnO nanorods array

Nano Research 2016年第2期9卷 344-352页

作者： Zhuo Kang Xiaoqin Yan Yunfei Wang Yanguang Zhao Zhiming Bai Yichong Liu Kun Zhao Shiyao Cao Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

Photoanodes, which are used in photoelectrochemical （PEC） water splitting, have been shown to be applicable in the construction of a PEC biosensing platform. This was realized by replacing water oxidization with oxidation of an appropriate test molecule. Here, we have demonstrated the feasibility of adopting photoanodes consisting of zinc oxide nanorods arrays decorated with plasmonic gold nanoparticles （Au NPs@ZnO NRs） for the self-powered PEC bioanalysis of glutathione （GSH） in phosphate-buffered saline （PBS） at an applied bias potential of 0 V vs. Ag/AgCl. This heterostructure exhibited enhanced PEC properties because of the introduction of the Au/ZnO interface. Under visible light illumination, hot electrons from surface-plasmon resonance （SPR） at the Au NP surface were injected into the adjacent ZnO and subsequently driven to the photocathode. Under ultraviolet （UV） light illumination, the photogenerated electrons in ZnO tended to transfer to the fluorine-doped tin oxide due to the step-wise energy band structure and the upward energy band bending at the ZnO/ electrolyte interface. These results indicate that plasmonic metal/semiconductor heterostructure photoanodes have great potential for self-powered PEC bioanalysis applications and extended field of other photovoltaic beacons.

关键词： plasmonic gold nanoparticle ZnO nanorod array photoelectrochemical biosensor glutathione

来源：评论

学校读者我要写书评

暂无评论

Transition Metal Nitrides as Promising Catalyst Supports for Tuning CO/H2Syngas Production from Electrochemical CO2Reduction

引用

Angewandte Chemie 2020年第28期132卷

作者： Yumeng Liu Dong Tian Akash N. Biswas Zhenhua Xie Sooyeon Hwang Ji Hoon Lee Hong Meng Jingguang G. Chen Department of Chemical Engineering Columbia University 821 Mudd Building New York NY 10027 USA School of Advanced Materials Peking University Shenzhen Graduate School Peking University Shenzhen Guangdong Province 518055 China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming Yunnan Province 650093 China Chemistry Division Brookhaven National Laboratory Building 555 Upton NY 11973 USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA

The electrochemical carbon dioxide reduction reaction (CO 2 RR) to produce synthesis gas (syngas) with tunable CO/H 2 ratios has been studied by supporting Pd catalysts on transition metal nitride (TMN) substrates. Combining experimental measurements and density functional theory (DFT) calculations, Pd‐modified niobium nitride (Pd/NbN) is found to generate much higher CO and H 2 partial current densities and greater CO Faradaic efficiency than Pd‐modified vanadium nitride (Pd/VN) and commercial Pd/C catalysts. In‐situ X‐ray diffraction identifies the formation of PdH in Pd/NbN and Pd/C under CO 2 RR conditions, whereas the Pd in Pd/VN is not fully transformed into the active PdH phase. DFT calculations show that the stabilized *HOCO and weakened *CO intermediates on PdH/NbN are critical to achieving higher CO 2 RR activity. This work suggests that NbN is a promising substrate to modify Pd, resulting in an enhanced electrochemical conversion of CO 2 to syngas with a potential reduction in precious metal loading.

关键词： carbon dioxide reduction reaction density functional theory interfacial energy metal nitrides palladium hydride

来源：评论

学校读者我要写书评

暂无评论

Effect of surface braided angle on vibration modal of a novel three-dimension and four-direction braided composite t-beam 21

Effect of surface braided angle on vibration modal of a nove...

引用

21st International Conference on Composite materials, ICCM 2017

作者： Pei, Xiaoyuan Wang, Huan Chen, Li Li, Jialu Tang, Youhong Composites Research Institute and Education Ministry Key Laboratory of Advanced Textile Composite Materials Tianjin Polytechnic University Tianjin300160 China School of Material Science and Engineering State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Polytechnic University Tianjin300387 China Institute of NanoScale Science and Technology Flinders University SA5042 Australia

Carbon fibre reinforced polymer (CFRP) composites are increasingly used in the aerospace field to reduce the weight and improve the stability of structures. In most conditions, micro-cracks presented in these structures propagate rapidly due to fatigue caused by vibrations, resulting in premature failure. In high-precision space missions, the structural design and dynamic performance of CFRP composites are integral to the performance of the spacecraft. This study focuses on the influence of a novel three-dimension (3 Dim) and four-direction (4 Dir) braided composite T-beam structural design on vibration properties. The effects of surface braided angles and geometry on the modal properties of the T-beam are investigated by means of modal experiments and finite element analysis. The results show that the structural design of the T-beam can meet various requirements of dynamic performance. © 2017 International Committee on Composite materials. All rights reserved.

关键词： Braiding Finite element analysis (FEA) Polymer-matrix composite (PMCs) Vibration

来源：评论

学校读者我要写书评

暂无评论

Design and tailoring of patterned ZnO nanostructures for energy conversion applications

引用

Science China materials 2017年第9期60卷 793-810页

作者：司浩楠康卓廖庆亮张铮张晓梅汪莉张跃 State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and TechnologyBeijingBeijing 100083China Department of Mechanical Engineering Tokyo Institute of TechnologyTokyoJapan Civil and Environment Engineering School University of Science and Technology BeijingBeijing 100083China Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology BeijingBeijing 100083China

ZnO is a typical direct wide-bandgap semiconductor material, which has various morphologies and unique physical and chemical properties, and is widely used in the fields of energy, information technology, biomedicine, and others. The precise design and controllable fabrication of nanostructures have gradually become important avenues to further enhancing the performance of Zn O-based functional nanodevices. This paper introduces the continuous development of patterning technologies, provides a comprehensive review of the optical lithography and laser interference lithography techniques for the controllable fabrication of Zn O nanostructures, and elaborates on the potential applications of such patterned Zn O nanostructures in solar energy, water splitting, light emission devices, and nanogenerators. Patterned Zn O nanostructures with highly controllable morphology and structure possess discrete three-dimensional space structure, enlarged surface area, and improved light capture ability, which realize the efficient carrier regulation,achieve highly efficient energy conversion, and meet the diverse requirements of functional nanodevices. The patterning techniques proposed for the precise design of Zn O nanostructures not only have important guiding significance for the controllable fabrication of complex nanostructures of other materials, but also open up a new route for the further development of functional nanostructures.

关键词： patterned ZnO nanorod arrays laser interference lithography optical lithography energy conversion devices

来源：评论

学校读者我要写书评

暂无评论

Nano‐Ferroelectric for High Efficiency Overall Water Splitting under Ultrasonic Vibration

引用

Angewandte Chemie 2019年第42期131卷

作者： Ran Su H. Alex Hsain Ming Wu Dawei Zhang Xinghao Hu Zhipeng Wang Xiaojing Wang Fa‐tang Li Xuemin Chen Lina Zhu Yong Yang Yaodong Yang Xiaojie Lou Stephen J. Pennycook College of Science Hebei University of Science and Technology Shijiazhuang 050018 China Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA Frontier Institute of Science and Technology State Key Laboratory for Mechanical behavior of Materials Xi'an Jiaotong University Xi'an 710049 China School of Materials Science and Engineering University of New South Wales Sydney New South Wales 2052 Australia Micro/Nano Science and Technology Center Jiangsu University Zhenjiang 212013 China Department of Energy Science Sungkyunkwan University Suwon 16419 Republic of Korea State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi'an 710072 China Department of Materials Science and Engineering Faculty of Engineering National University of Singapore Singapore 117574 Singapore

Piezocatalysis, converting mechanical vibration into chemical energy, has emerged as a promising candidate for water‐splitting technology. However, the efficiency of the hydrogen production is quite limited. We herein report well‐defined 10 nm BaTiO 3 nanoparticles (NPs) characterized by a large electro‐mechanical coefficient which induces a high piezoelectric effect. Atomic‐resolution high angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) and scanning probe microscopy (SPM) suggests that piezoelectric BaTiO 3 NPs display a coexistence of multiple phases with low energy barriers and polarization anisotropy which results in a high electro‐mechanical coefficient. Landau free energy modeling also confirms that the greatly reduced polarization anisotropy facilitates polarization rotation. Employing the high piezoelectric properties of BaTiO 3 NPs, we demonstrate an overall water‐splitting process with the highest hydrogen production efficiency hitherto reported, with a H 2 production rate of 655 μmol g −1 h −1 , which could rival excellent photocatalysis system. This study highlights the potential of piezoelectric catalysis for overall water splitting.

关键词： Ferroelektrische Phasen Phasenkoexistenz Piezokatalyse Piezoelektischer Effekt Wasserspaltung

来源：评论

学校读者我要写书评

暂无评论

Triboelectricity-assisted transfer of graphene for flexible optoelectronic applications

引用

Nano Research 2016年第4期9卷 899-907页

作者： Shuo Liu Qingliang Liao Shengnan Lu Xiaohui Zhang Zheng Zhang Guangjie Zhang Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

In this work, we developed a novel triboelectricity-assisted polymer-free method for the transfer of large-area chemical vapor deposited graphene films. With the assistance of electrostatic forces from friction-generated charges, graphene sheets were successfully transferred from copper foils to flexible polymer substrates. Characterization results confirmed the presence of high quality graphene with less defects and contaminations, compared to graphene transferred by conventional poly（methyl rnethacrylate）-mediated processes. In addition, the graphene samples possessed outstanding electrical transport capabilities and mechanical stability, when studied as electron transfer matrixes in graphene/ZnO hybrid flexible photodetectors. Our results showed a broad application potential for this transfer method in future flexible electronics and optoelectronics.

关键词： graphene transfer triboelectricity-assisted polymer-free flexible photodetector

来源：评论

学校读者我要写书评

暂无评论

Illumination-dependent free carrier screening effect on the performance evolution of ZnO piezotronic strain sensor

引用

Nano Research 2016年第4期9卷 1091-1100页

作者： Pei Lin Yousong Gu Xiaoqin Yan Shengnan Lu Zheng Zhang Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Belling Beijing 100083 China The Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Belling Beijing 100083 China

Performance modulation of ZnO optoelectronic devices in the presence of proper piezoelectric polarization charges has been widely reported, whereas relatively less work has been performed about the influence of photoexcitation on piezotronics. In this stud~ we experimentally investigated the performance evolution of ZnO piezotronic strain sensor under various 365 nm UV irradiation densities. The device demonstrated a response ratio of -200 under no illumination and under -0.53% compressive strain, and the response time is approximately 0.3 s. However, tremendous performance degradation was observed with the increase in the illumination densi~, which is attributed to the W-modulated change in the free electron concentration and Schottky barrier height. It was observed that increased carrier density intensifies the screening effect and thus, the modulation ability of piezo-polarization charges weakens. Meanwhile, the deterioration of rectifying behavior at the interface under UV illumination also jeopardizes the device performance.

关键词： piezotronics barrier height ultraviolet illumination surface absorption screening effect

来源：评论

学校读者我要写书评

暂无评论

Influence of carrier concentration on the resistive switching characteristics of a ZnO-based memristor

引用

Nano Research 2016年第4期9卷 1116-1124页

作者： Yihui Sun Xiaoqin Yan Xin Zheng Yichong Liu Yanwei Shen Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

Sandwich-style memristor devices were synthesized by electrochemical deposition with a ZnO film serving as the active layer between Al-doped ZnO （AZO） and Au electrodes. The carrier concentration of the ZnO films is controlled by adding HNO3 during the growth process. A resulting increase in carrier concentration from 10^17 to 10^19 cm^-3 was observed, along with a corresponding drop in the on--off ratio from 6,437% to 100%. The resistive switching characteristics completely disappeared when the carrier concentration was above 1029 cm-3, making it unsuitable for a memory device. The decreasing switching ratio is attributed to a reduction in the driving force for oxygen vacancy drift. Systematic analysis of the migration of oxygen vacancies is presented, including the concentration gradient and electrical potential gradient. Such oxygen vacancy migration dynamics provide insight into the mechanisms of the oxygen vacancy drift and provide valuable information for industrial production of memristor devices.

关键词： resistive switch carrier concentration driving force potential gradient concentration gradient

来源：评论

学校读者我要写书评

暂无评论

The coupling influence of UV illumination and strain on the surface potential distribution of a single ZnO micro/nano wire

引用

Nano Research 2016年第9期9卷 2572-2580页

作者： Zhao Wu Junjie Qi Feng Li Xiaoyang Zhu Zengze Wang Guangjie Zhang Yue Zhang School of Materials Science and Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China The Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology BeijingBeijing 100083China

Interface/surface properties play an important role in the development of most electronic devices. In particular, nanowires possess large surface areas that create new challenges for their optoelectronic applications. Here, we demonstrated that the piezoelectric field and UV laser illumination modulate the surface potential distribution of a bent ZnO wire by the Kelvin probe force microscopy technology. Experiments showed that the surface potential distribution was changed by strain. The difference of surface potential between the outer/inner sides of the ZnO wire increased with increasing strain. Under UV laser illumination, the difference of surface potential between the outer/inner sides of the ZnO wire increased with increasing strain and illumination time. The origin of the observed phenomenon was discussed in terms of the energy band diagram of the bent wire and adsorption/desorption theory. It is suggested that the change of surface potential can be attributed to the uneven distribution of the carrier density across the wire deduced by the piezoelectric effect and surface adsorption/desorption of oxygen ions. This study provides an important insight into the surface and piezoelectric effects on the surface potential and can help optimize the performance of electronic and optoelectronic devices. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： ZnO ultraviolet illumination strain surface potential

来源：评论

学校读者我要写书评

暂无评论

Electromagnetic wave absorption in reduced graphene oxide functionalized with Fe3O4/Fe nanorings

引用

Nano Research 2016年第7期9卷 2018-2025页

作者： Yi Ding Long Zhang Qingliang Liao Guangjie Zhang Shuo Liu Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

We report the preparation of nanocomposites of reduced graphene oxide with embedded Fe3O4/Fe nanorings （FeNR@rGO） by chemical hydrothermal growth. We illustrate the use of these nanocomposites as novel electromagnetic wave absorbing materials. The electromagnetic wave absorption properties of the nanocomposites with different compositions were investigated. The preparation procedure and nanocomposite composition were optimized to achieve the best electromagnetic wave absorption properties. Nanocomposites with a GO：cx-Fe203 mass ratio of 1：1 prepared by annealing in HdAr for 3 h exhibited the best properties. This nanocomposite sample （thickness = 4.0 mm） showed a minimum reflectivity of -23.09 dB at 9.16 GHz. The band range was 7.4-11.3 GHz when the reflectivity was less than -10 dB and the spectrum width was up to 3.9 GHz. These figures of merit are typically of the same order of magnitude when compared to the values shown by traditional ferric oxide materials. However, FeNR@rGO can be readily applied as a microwave absorbing material because the production method we propose is highly compatible with mass production standards.

关键词： Fe3O4/Fe nanorings reduced graphene oxide X-ray diffraction Raman spectrum hydrothermal method

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：