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hydrothermal growth of symmetrical ZnO nanorod arrays on nanosheets for gas sensing applications

Frontiers of Materials Science 2017年第3期11卷 271-275页

作者： Wenyan ZHAO Chuanjin TIAN Zhipeng XIE Changan WANG Wuyou FU Haibin YANG School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333403 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China

The hierarchical ZnO nanostructures with 2-fold symmetrical nanorod arrays on zinc aluminum carbonate （ZnAl-CO3） nanosheets have been successfully synthesized through a two-step hydrothermal process. The primary nanosheets, which serve as the lattice-matched substrate for the self-assembly nanorod arrays at the second-step of the hydrothermal route, have been synthesized by using a template of anodic aluminum oxide （AAO）. The as-prepared samples were characterized by XRD, FESEM, TEM and SAED. The nanorods have a diameter of about 100 nm and a length of about 2μ m. A growth mechanism was proposed according to the experimental results. The gas sensor fabricated from ZnO nanorod arrays showed a high sensitivity to ethanol at 230℃. In addition, the response mechanism of the sensors has also been discussed according to the transient response of the gas sensors.

关键词： ZnO nanorods hydrothermal growth gas sensitivity

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Decorating multiwalled carbon nanotubes with zinc oxide nano-crystallines through hydrothermal growth process

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Science China(Technological Sciences) 2012年第5期55卷 1365-1370页

作者： LI ChenSha QIAO YingJie LI YuMing Department of Chemical Engineering McMaster UniversityHamiltonl Ontario L8S 4L7Canada Department of Materials Science Harbin Engineering UniversityHarbin 150001China Materials Design&Integration Laboratory Xerox Research Centre of CanadaOntario L5K 2L1Canada

Multiwalled-carbon nanotubes coated with nano-crystalline zinc oxide （ZnO） was prepared by in situ growth of nano zinc oxide on the surfaces of carbon nanotubes through hydrothermal method. X-ray diffraction, transmission electron microscopy and scanning electron microscopy analysis techniques were used to characterize the samples. It was observed that a layer of nano-crystalline ZnO with the wurtzite hexagonal crystal structure was uniformly coated on the nanotube surfaces with good adhesion, which resulted in the formation of a novel ZnO-nanotuhe nano composite. In this work, the carbon nanotubes decorated by metal oxide nanoparticles were synthesized by a simple chemical-solution route which is suitable for the large-scale production with low cost.

关键词： carbon nanotubes transmission electron microscopy zinc oxide hydrothermal growth

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hydrothermal growth of MoS_2/Co_3S_4 composites as efficient Pt-free counter electrodes for dye-sensitized solar cells

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Science China Materials 2017年第4期60卷 295-303页

作者：董飞燕郭延军徐鹏殷雄李远刚贺蒙 College of Chemistry and Chemical Engineering Xi'an University of Science and Technology Xi'an 710054 China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China School of Science Beijing University of Chemical Technology Beijing 100029 China State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China

MOS2/Co3S4 composite films were prepared via a facile one-step hydrothermal method, and used as efficient and low-cost Pt-free counter electrodes （CEs） for dye-sen- sitized solar cells （DSSCs）. Characterizations revealed that Co3S4 and MoS2 were obtained simultaneously during the facile hydrothermal process. The composites afforded a promising synergistic effect on the catalyzing of triiodide reduction. Enhanced electrocatalytic performance of the resultant composite films was confirmed through cyclic voltammetry （CV） and electrochemical impedance spec- troscopy （EIS） analyses. DSSCs using MoS2/Co3S4 composite CEs outperform the devices with pristine MoS2 or Co3S4 CEs in power conversion efficiency （PCE）. Furthermore, a PCE of 6.77% is obtained for the optimized devices using MoS2/Co3S4 composite CEs measured under standard 1 sun illumination （100 mW cm-2, AM 1.5G）, which is comparable to that of the devices fabricated under the same conditions with conventional thermally deposited Pt CEs （7.14%）. The results demonstrate that MoS2/Co3S4 composites are promis- ing alternatives to Pt to be applied as CEs for DSSCs,

关键词： dye-sensitized solar cells counter electrodes composites transition metal sulfide hydrothermal growth electro-chemical impedance spectroscopy

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hydrothermal growth of center-hollow star-like ZnO architectures assembled by hexagonal conic nanotubes

Hydrothermal growth of center-hollow star-like ZnO architect...

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中国化学会第26届学术年会纳米化学分会场

作者： Hanmei Hu1,*, Chonghai Deng2 , Xianhuai Huang3 1College of Material Science and Engineering, Anhui University of Architecture, Hefei 230022 2 Department of Chemistry and Materials Engineering, Hefei University, Hefei 230022, 3Department of Environment Engineering, Anhui University of Architecture, Hefei 230022

Three-dimensional （3D） center-hollow star-like ZnO architectures have been successfully fabricated on a large scale using Zn（acac）2 （acac= acetylacetone） and ethylenediamine as starting reactants via a surfactant-assisted hydrothermal technique. Field emission scanning electron microscopy （FESEM） images show that the 3D star-like ZnO architectures are center-hollow, which are composed of hexagonal conic nanotubes. The contrastive experiments results indicate that the introduction of surfactant （PVP or PEG） was indispensable in controlling the growth of star-like ZnO with hollow structure. A possible formation mechanism was proposed. Fig.2. FESEM images of the as-prepared ZnO products: （a,b） using PVP as surfactant and （c,d） Using PEG10000 as surfactant

关键词： Nanostructures hydrothermal growth ZnO

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Effect of growth time on morphology and photovoltaic properties of ZnO nanowire array films

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Rare Metals 2011年第6期30卷 676-680页

作者： YANG Weiguang WANG Yali ZHEN Qiang SHI Weimin Department of Electronic Information Materials School of Materials Science and Engineering Shanghai University Shanghai 200072 China Nano-Science and Nano-Technology Research Center School of Materials Science and Engineering Shanghai University Shanghai 200444 China

Single-crystalline ZnO nanowire arrays with different aspect ratios and nanowire densities were prepared by the hydrothermal growing method using polyethyleneimine （PEI） as a surfactant. PEI can only hinder the lateral growth of the ZnO nanowires, which is observed by high resolution transmission electron microscopy （HRTEM） analysis. Dye-sensitized solar cells were assembled by the ZnO nanowire arrays with different thicknesses, which can be controlled by the growing time and characterized using photocurrent-voltage measurements. Their photocurrent densities and energy allover conversion efficiencies increased with increasing ZnO nanowire lengths. Short-circuit current density of 4.31 ***-2 and allover energy conversion efficiency of 0.87% were achieved with 12.9-μm-long ZnO nanowire arrays.

关键词： inorganic non-metal materials ZnO nanowires hydrothermal growth morphology

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Sensitization of hydrothermally Grown Single Crystalline TiO2 Nanowire Array with CdSeS Nanocrystals for Photovoltaic Applications

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Nano Research 2011年第12期4卷 1181-1190页

作者： Akshay Kumar Kuan-teh Li Anuj R. Madaria Chongwu Zhou Department of Electrical Engineering and Center for Energy Nanoscience and Technology University of Southern California Los AngelesCA 90089 USA

An oriented array of electron transporting nanowires, grown directly on a transparent conductor constitutes an optimal architecture for efficient photovoltaic applications. In addition, semiconductor nanocrystals can work as efficient light absorbers because of their tunable optical properties. In this paper, we use an oriented array of TiO2 nanowires grown directly on a transparent conductive electrode and subsequently sensitized with colloidally grown CdSeS nanocrystal quantum dots （QDs）, using an efficient bi-linker assisted methodology, to demonstrate photovoltaic cells. Upon excitation with light, exciton dissociation takes place at the nanowire-nanocrystal interface, after which, electrons are transported to the fluorine-doped tin oxide （FTO） electrode via single-crystalline TiO2 nanowire channels. We demonstrate that an ex situ ligand exchange of QDs followed by sensitization on oxygen-plasma treated TiO2 nanowires results in enhanced loading of QDs, as compared to the in situ ligand exchange approach. An array of 1μm long TiO2 nanowire sensitized with CdSeS nanocrystals exhibits photovoltaic effects with a short-circuit current of 2-3 mA/cm2, an open circuit voltage of 0.6-0.7 V and a fill factor of 52-5%, resulting in devices with efficiencies of up to 0.6%.

关键词： TiO2 nanowire semiconductor nanocrystals solar cells hydrothermal growth

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Advances in advanced solution-synthesis-based structural materials for tactile sensors and their intelligent applications

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InfoMat 2024年第1期6卷 31-64页

作者： Hongsen Niu Ning Li Eun-Seoung Kim Young Kee Shin Nam-Young Kim Guozhen Shen Yang Li School of Information Science and Engineering University of JinanJinanthe People's Republic of China RFIC Centre Department of Electronics EngineeringKwangwoon UniversitySeoulRepublic of Korea Department of Molecular Medicine and Biopharmaceutical Sciences Seoul National UniversitySeoulRepublic of Korea School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijingthe People's Republic of China School of Microelectronics Shandong UniversityJinanthe People's Republic of China

Intelligent applications,with tactile sensors at their core,represent significant advancement in the field of artificial ***,achieving perception abilities in tactile sensors that match or exceed human skin remains a formidable ***,the design and implementation of hierarchical structural materials are considered the optimal solution to this *** contrast to conventional methods,such as complicated lithography and three-dimensional printing,the cost-effective and scalable nature of advanced solution-synthesis methods makes them ideal for preparing diverse tactile sensors with hierarchical structural ***,the process and applicability of advanced solution synthesis methods have yet to form a seamless ***,the development and intellectualization of tactile sensors based on advanced solution synthesis methods are still in their early stages,and require a comprehensive and systematic review to usher in *** study delves into the advantages and disadvantages of various advanced solution synthesis methods,providing detailed ***,the positive effects of hierarchical structural materials constructed using these methods in tactile sensors and their intelligent applications are also discussed in ***,the challenges and future opportunities faced by this emerging field are summarized.

关键词： aqueous phase reduction artificial intelligence hydrothermal growth in situ polymerization tactile sensor

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