检索结果-内蒙古大学图书馆

Enhanced performance of ZnO piezotronic pressure sensor through electron-tunneling modulation of MgO nanolayer

ACS Applied materials and Interfaces 2015年第3期7卷 1602-1607页

作者： Liao, Xinqin Yan, Xiaoqin Lin, Pei Lu, Shengnan Tian, Yuan Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

Piezoelectric materials can be applied into electromechanical conversion and attract extensive attention with potential applications in various sensors. Here, we present two types of piezotronic pressure sensors based on ZnO nanoarrays. By introducing an insulating MgO (i-MgO) nanolayer, the "on/off" current ratio of the sensor is significantly improved up to 105. Furthermore, the sensor shows a high sensitivity of 7.1 × 104 gf-1, a fast response time of 128 ms. The excellent properties are attributed to the combination of piezoelectric effect of ZnO nanoarrays and electron-tunneling modulation of MgO nanolayer, and the reversible potential barrier height controlled by piezoelectric potential. We further investigate the service behavior of the sensor, which can detect force varying from 3.2 to 27.2 gf. Our research provides a promising approach to boost the performance of nanodevices. © 2015 American Chemical Society.

关键词： Magnesia

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Influence of the carrier concentration on the piezotronic effect in a ZnO/Au Schottky junction

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Nanoscale 2015年第10期7卷 4461-4467页

作者： Lu, Shengnan Qi, Junjie Gu, Yousong Liu, Shuo Xu, Qiankun Wang, Zengze Liang, Qijie Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

The piezotronic effect, which utilizes the piezopotential to engineer the interface characteristics, has been widely exploited to design novel functional device or to optimize the device performance, which is intimately related to the carrier concentration. Here, by constructing a general Schottky diode, the piezotronic effect dependence on the carrier concentration was investigated systematically using ultraviolet (UV) illumination. Scanning Kelvin Probe Microscopy was employed to quantify the carrier concentration in ZnO nanorods under UV illumination. The results showed that the carrier concentration increases with increasing light intensity and an average value of up to 5.6 × 1018 cm-3 under 1.2 mW cm-2 light illumination was obtained. Furthermore, with increasing UV light intensity, an increasingly imperceptible variation in the current-voltage characteristics under strain was observed, which finally disappeared under 1.2 mW cm-2 light illumination. This phenomenon was attributed to the weakened modulation ability of the piezopotential due to the strengthened screening effect. In addition, the gradual disappearing in the barrier also contributed to the gradual disappearance of the piezotronic effect. This study provides an in-depth understanding of piezotronics, which could be extended to other piezoelectric devices and guide the design and optimization of piezotronic and even piezophototronic devices. This journal is © The Royal Society of Chemistry.

关键词： Carrier concentration

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High on-off ratio improvement of ZnO-based forming-free memristor by surface hydrogen annealing

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ACS Applied materials and Interfaces 2015年第13期7卷 7382-7388页

作者： Sun, Yihui Yan, Xiaoqin Zheng, Xin Liu, Yichong Zhao, Yanguang Shen, Yanwei Liao, Qingliang Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

In this work, a high-performance, forming-free memristor based on Au/ZnO nanorods/AZO (Al-doped ZnO conductive glass) sandwich structure has been developed by rapid hydrogen annealing treatment. The Ron/Roff rate is dramatically increased from ∼10 to ∼104 after the surface treatment. Such an enhanced performance is attributed to the introduced oxygen vacancies layer at the top of ZnO nanorods. The device also exhibits excellent switching and retention stability. In addition, the carrier migration behavior can be well interpreted by classical trap-controlled space charge limited conduction, which verifies the forming of conductive filamentary in low resistive state. On this basis, Arrhenius activation theory is adopted to explain the drifting of oxygen vacancies, which is further confirmed by the time pertinence of resistive switching behavior under different sweep speed. This fabrication approach offers a useful approach to enhance the switching properties for next-generation memory applications. © 2015 American Chemical Society.

关键词： Chemical activation

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Au-embedded ZnO/NiO hybrid with excellent electrochemical performance as advanced electrode materials for supercapacitor

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ACS Applied materials and Interfaces 2015年第4期7卷 2480-2485页

作者： Zheng, Xin Yan, Xiaoqin Sun, Yihui Bai, Zhiming Zhang, Guangjie Shen, Yanwei Liang, Qijie Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

Here we design a nanostructure by embedding Au nanoparticles into ZnO/NiO core-shell composites as supercapacitors electrodes materials. This optimized hybrid electrodes exhibited an excellent electrochemical performance including a long-term cycling stability and a maximum specific areal capacitance of 4.1 F/cm2 at a current density of 5 mA/cm2, which is much higher than that of ZnO/NiO hierarchical materials (0.5 F/cm2). Such an enhanced property is attributed to the increased electro-electrolyte interfaces, short electron diffusion pathways and good electrical conductivity. Apart from this, electrons can be temporarily trapped and accumulated at the Fermi level (EF) because of the localized schottky barrier at Au/NiO interface in charge process until fill the gap between ZnO and NiO, so that additional electrons can be released during discharge. These results demonstrate that suitable interface engineering may open up new opportunities in the development of high-performance supercapacitors. © 2015 American Chemical Society.

关键词： Gold nanoparticles

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Three-dimensional ordered ZnO/Cu2O nanoheterojunctions for efficient metal-oxide solar cells

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ACS Applied materials and Interfaces 2015年第5期7卷 3216-3223页

作者： Chen, Xiang Lin, Pei Yan, Xiaoqin Bai, Zhiming Yuan, Haoge Shen, Yanwei Liu, Yichong Zhang, Guangjie Zhang, Zheng Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

Interface modulation for broad-band light trapping and efficient carrier collection has always been the research focus in solar cells, which provides the most effective way to achieve performance enhancement. In this work, solution-processed 3D ordered ZnO/Cu2O nanoheterojunctions, consisting of patterned n-ZnO nanorod arrays (NRAs) and p-Cu2O films, are elaborately designed and fabricated for the first time. By taking advantage of nanoheterojunctions with square patterned ZnO NRAs, solar cells demonstrate the maximum current density and efficiency of 9.89 mA cm-2 and 1.52%, which are improved by 201% and 127%, respectively, compared to that of cells without pattern. Experimental analysis and theoretical simulation confirm that this exciting result originates from a more efficient broad-band light trapping and carrier collection of the 3D ordered ZnO/Cu2O nanoheterojunctions. Such 3D ordered nanostructures will have a great potential application for low-cost and all oxide solar energy conversion. Furthermore, the methodology applied in this work can be also generalized to rational design of other efficient nanodevices and nanosystems. © 2015 American Chemical Society.

关键词： Modulation

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Size dependence and UV irradiation tuning of the surface potential in single conical ZnO nanowires

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RSC Advances 2015年第52期5卷 42075-42080页

作者： Wang, Zengze Gu, Yousong Qi, Junjie Lu, Shengnan Li, Peifeng Lin, Pei Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing100083 China

Investigating and tailoring surface potential changes of a system at the interfaces is of significance in the fundamental understanding and application of semiconductor devices. Thus the surface potential of zinc oxide (ZnO) nanowires is a vital factor to tune the performance of devices. In this paper, Kelvin probe force microscopy (KPFM) is used to measure the surface potential of single conical ZnO nanowires with different diameters. A size dependence of the surface potential in single conical ZnO nanowires is experimentally revealed. As the diameter decreases, the surface potential of the ZnO nanowires is found to decrease linearly under 400 nm. At large diameters (≥400 nm), the surface potential remains almost constant. The contact potential difference of the ZnO-PtIr tip increases to saturation after 40 min UV illumination and remains stable. An energy band theory is introduced to explore the surface potential change of ZnO nanowires under UV illumination. This study provides an understanding of the surface electrical properties of semiconductors at the nanoscale, which is valuable for optimizing functional nanodevices based on semiconductor nanowires. © The Royal Society of Chemistry.2015.

关键词： Surface potential

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Towards polyvalent ion batteries: A zinc-ion battery based on NASICON structured Na 3 V 2 (PO 4 ) 3

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Nano Energy 2016年 25卷 211-217页

作者： Guolong Li Ze Yang Yan Jiang Chuanhong Jin Wei Huang Xuli Ding Yunhui Huang State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China Hubei Collaborative Innovation Center for High-efficient Utilization of Solar Energy Wuhan 430068 China School of Electrical & Electronic Engineering Hubei University of Technology Wuhan 430068 China State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province School of Materials Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 China Collaborative Innovation Center of Intelligent New Energy Vehicle School of Materials Science and Engineering Tongji University Shanghai 201804 China

Zinc-ion batteries are considered as potential large-scale renewable energy storage devices due to low redox potential, low cost, large capacity, high electric conductivity, nontoxicity and easy processing of zinc metal. However, the development of cathode materials for zinc-ion batteries to date has been mainly limited to tunnel manganese oxides and Prussian blue analogues. Here we have firstly developed NASICON structured Na 3 V 2 (PO 4 ) 3 as cathode material for Zn-ion batteries. To compensate the low conductivity, graphene-like carbon wrapped Na 3 V 2 (PO 4 ) 3 nanoparticles are fabricated. With Na 3 V 2 (PO 4 ) 3 /C as cathode, Zn metal as both counter and reference electrodes, and 0.5 mol L −1 Zn(CH 3 COO) 2 solution as electrolyte, the aqueous Zn-ion battery delivers a reversible capacity of 97 mA h g −1 at 0.5 C and retains 74% capacity after 100 cycles. Meanwhile, the battery can be charged and discharged at high rate up to 10 C. The cyclic voltammogram analysis shows that the Zn-ion storage in Na 3 V 2 (PO 4 ) 3 is a diffusion-controlled kinetic process. A mechanism of Zn ion occupancy variation during cycling is proposed. Our results provide an example for understanding and designing the intercalation process of divalent metal ions in NASICON structured cathode for new type rechargeable divalent metal ion batteries.

关键词： Zn-ion batteries NASICON Na 3 V 2 (PO 4 ) 3 Ion occupancy variation

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Sol-gel synthesis of mesoporous spherical zirconia

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RSC Advances 2015年第127期5卷 104629-104634页

作者： Chang, Yulei Wang, Chen Liang, Tongxiang Zhao, Chunsong Luo, Xi Guo, Ting Gong, Jianghong Wu, Hui State Key Laboratory of New Ceramics and Fine Processing Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Beijing Key Laboratory of Fine Ceramics Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China

Mesoporous spherical zirconia (ZrO2) with a surface area of 113 m2 g-1 and average pore size of 5.0 nm is prepared by a sol-gel method with ZrOCl2·8H2O precursors and Sodium Dodecyl Sulfonate (SDS) templates with subsequent annealing at 500 °C in air. After calcination at 700 °C, the tetragonal phase transfers to monoclinic zirconia and the surface area is reduced to 26 m2 g-1. The mesoporous spherical structure, which is assembled by aggregation of the ZrO2 nanoparticles, is confirmed by characterization using low and wide-angle X-ray diffraction, Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). Mesoporous ZrO2 with a surface area of 113 m2 g-1 has a higher adsorption for Cs ion (357 mg g-1). For the 700 °C calcinated ZrO2, the absorption capacity at equilibrium is only 188 mg g-1. © The Royal Society of Chemistry 2015.

关键词： Zirconia

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Flexible Electrodes: Roll‐to‐Roll Production of Transparent Silver‐Nanofiber‐Network Electrodes for Flexible Electrochromic Smart Windows (Adv. Mater. 41/2017)

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advanced materials 2017年第41期29卷

作者： Sen Lin Xiaopeng Bai Haiyang Wang Haolun Wang Jianan Song Kai Huang Chang Wang Ning Wang Bo Li Ming Lei Hui Wu State Key Laboratory of Information Photonics and Optical Communications and School of Science Beijing University of Posts and Telecommunications Beijing 100876 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Advanced Materials Institute Shenzhen Graduate School Tsinghua University Shenzhen 518055 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China

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2D materials: Layer Dependence and Light Tuning Surface Potential of 2D MoS2on Various Substrates (Small 14/2017)

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Small 2017年第14期13卷

作者： Feng Li Junjie Qi Minxuan Xu Jiankun Xiao Yuliang Xu Xiankun 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 P. R. China Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 P. R. China

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