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一种新的WO3纳米管的制备方法 总被引:6,自引:1,他引:6
一维纳米材料因可用来构造高性能纳米器件的结构单元而成为纳米材料研究的热点.目前的研究重点集中在材料的制备和结构性能表征方面,已发展了多种制备方法,主要有模板法、V-L-S法、L-L-S法和V-S法等,其中阳极氧化铝(AAO)模板法是制备一维材料的好方法.AAO模板的制备工艺已相当成熟, 相似文献
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近年来.一维纳米结构如纳米线、纳米棒、纳米带等.由于其新颖的物理化学性质及其在光学或电学器件上的广泛应用前景.已成为研究开发的热点。特别是氧化锌(ZnO)这种宽禁带(3.37eV)、高激子束缚能(60meV)的功能性半导体材料。基于它在光电子器件、太阳能电池、传感器、二极管、场发射显示器等领域潜在的重要应用价值,各国科学工作者都给予极大的研究热情.开发出了许多合成方案制备一维纳米ZnO结构,如水热法,模板法同,微乳液法阐,CVD法,热蒸发法,MOVPE法,电化学沉积法等。 相似文献
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模板法制备高度有序的聚苯胺纳米纤维阵列 总被引:19,自引:0,他引:19
近年来,利用化学或物理方法制备多种材料的纳米有序阵列复合结构已成为学术界的研究热点.用具有纳米孔洞的模板(多孔阳极氧化铝、多孔硅以及聚碳酸脂膜)制备的金属、半导体、碳纳米管等材料的纳米有序阵列复合结构已在润滑、微电极、单电子器件、传感器、垂直磁记录、场致电 相似文献
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模板合成法制备金纳米线的研究 总被引:26,自引:2,他引:24
近年来,利用化学和物理方法制备各种高度有序的纳米结构材料已经成为学术界的研究热点之一.其中,在特定的模板中沉积各种材料而构建纳米点阵的方法,具有制备简便,成本较低等优点,而且在尺度上可以突破刻蚀技术的局限性,具有广泛的应用前景[1].常用的模板有阳极氧化多孔铝(AAO)、多孔硅和聚合物等,其中AAO模板具有耐高温,绝缘性好,孔洞分布均匀有序,而且大小可控等特点[2],是使用较为广泛的一种.利用阳极氧化铝为模板,采用电化学方法[3~7]或压差注入法[8]制备有序的纳米粒子点阵,已经在润滑[9]、电… 相似文献
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模板法制备枝状Pt纳米线 总被引:10,自引:2,他引:8
一维纳米材料的制备是近年来纳米材料的研究热点. 利用具有纳米尺度的孔洞阵列模板沉积各种材料构筑纳米线的方法具有制备简便和成本较低等优点[1,2]. 常用的模板有多孔阳极氧化铝(AAO)、多孔硅和聚合物等, 其中AAO模板具有耐高温, 绝缘性好, 孔洞分布均匀, 孔径、孔深大小可控等特点, 是模板法研究的热点. 通过模板法电化学沉积制备各种金属纳米线已有很多报道[3~8], 本研究小组也曾报道了模板法电化学沉积Au等纳米线的制备及性质[9~12], 但用该方法制备的金属纳米线都为单一的线状结构. 组成当代大规模集成电路的基本器件一般具有3个或3个以上的电极. 单一的线状结构纳米线, 不能满足纳米电子学对纳米材料和纳米器件性能研究的需要. 在纳米器件的特性研究和探索中, 枝状或Y形纳米结的制备有重要的意义, 它是纳米器件从理论到实用化的必备条件. Sui等[13]用模板法成功制备了枝状碳纳米管, 但用AAO模板制备枝状金属纳米线的研究至今还未见报道. 本文通过控制铝片的阳极氧化条件, 先制备出具有分枝状孔洞结构的AAO模板, 再用电化学法沉积金属Pt, 实现了枝状Pt纳米线的可控生长. 这对其它金属枝状纳米线的制备以及进一步掺杂、构筑纳米原型器件等具有显著的实用价值. 相似文献
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多孔阳极氧化铝(PAA)模板具有六角有序排列的柱形孔,且孔径均匀可调,加之其良好的机械和热稳定性,在纳米材料领域得到了广泛研究和应用。近年来,人们通过改变铝阳极氧化条件制备出了多种特殊型纳米PAA模板,并利用这些模板结合物理或化学方法成功地合成了多种新型纳米功能材料。本文在简要介绍常规纳米PAA模板制备的基础上,较全面地综述了诸如孔道呈分叉形、锯齿形、骨形、倒圆锥形,孔洞呈菱形、三角形、正方形,孔道或孔壁结构呈周期性变化等特殊型纳米PAA模板的制备,揭示了电场强度和电解液种类、温度在PAA孔洞形貌尺寸调控方面的重要性,并展望了这类模板的发展方向及应用前景。 相似文献
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本文对合成TiO2一维纳米材料及其有序纳米阵列的阳极氧化法、模板法以及水热法进行了全面而系统的评述,着重介绍了它们的最新研究进展。阳极氧化法能制备牢固负载于基体上的TiO2纳米管阵列,这有助于构筑TiO2纳米结构及其在纳米器件上的应用;与多种制备技术如溶胶-凝胶工艺、电化学沉积以及原子层沉积等相结合,模板法可以合成出多种形貌的TiO2纳米材料如纳米管、纳米线和纳米棒,并且可以通过改变所用模板的微观尺寸来调控TiO2一维纳米材料及其有序阵列的微结构参数;水热合成法可以制备出直径小且比表面积大的TiO2纳米管粉末。从目前来看,该法还不能制备出牢固负载于基体上的有序纳米阵列。文章最后指出了TiO2一维纳米材料及其有序纳米阵列合成中存在的问题及今后发展方向。 相似文献
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As an important preparation method of nano-structured materials, template synthesis[1] attracted great interests in recent years. Different kinds of template such as anodic porous alumina, polymer and nano-channel glass templates have been widely studied. Compared with other templates, the size of holes in the porous alumina template can be easily controlled by properly adjusting the condition of anodization. In addition, Nano-structured material prepared from the template also provides an ideal system[2] to investigate the effects of size of materials toward electrode's performance. In this paper, various nano-structured materials such as spinel LiMn2O4 and carbon nanotubes by using porous alumina template have been prepared and characterized. 相似文献
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Chen J Zhou X Snyder GJ Uher C Chen N Wen Z Jin J Dong H Qiu P Zhou Y Shi X Chen L 《Chemical communications (Cambridge, England)》2011,47(44):12173-12175
Lithium intercalation and de-intercalation processes have been used to fabricate bulk Bi(2)Se(0.3)Te(2.7) with internal nanostructures. The doped Li content can be precisely controlled through this method. It provides a chance to directly optimize electrical properties when preparing nano-structured materials, leading to the optimum carrier concentration for improved thermoelectric figure of merit. 相似文献
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Solution-based synthetic strategies for 1-D nanostructures 总被引:1,自引:0,他引:1
One-dimensional (1-D) nanostructures of materials have received great research attention because of their unique photochemistry, photophysical, and electron-transport properties different from those of bulky or nanoparticle materials. One of the main challenges in this field is how to precisely control the sizes, dimensionalities, compositions, and crystal structures of materials in nanoscale. This review summarizes the recent progress in the solution-based routes to prepare 1-D nanostructures, highlighting the contribution from this laboratory. Crystal structure as one of the inherent factors that may determine the growth behavior of the nanocrystals is emphasized in this paper. Particularly compounds with layered structures or anistropic crystal structures are given special attention in the controlled growth of 1-D nanostructures. This review aims to present a relatively general understanding of the correlation between the crystal structure and growth behavior of materials under solution-based conditions and show how to choose appropriate conditions for the growth of 1-D nanostructures. 相似文献
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B Jang M Park OB Chae S Park Y Kim SM Oh Y Piao T Hyeon 《Journal of the American Chemical Society》2012,134(36):15010-15015
Extensive applications of rechargeable lithium-ion batteries (LIBs) to various portable electronic devices and hybrid electric vehicles result in the increasing demand for the development of electrode materials with improved electrochemical performance including high energy, power density, and excellent cyclability, while maintaining low production cost. Here, we present a direct synthesis of ferrite/carbon hybrid nanosheets for high performance lithium-ion battery anodes. Uniform-sized ferrite nanocrystals and carbon materials were synthesized simultaneously through a single heating procedure using metal-oleate complex as the precursors for both ferrite and carbon. 2-D nanostructures were obtained by using sodium sulfate salt powder as a sacrificial template. The 2-D ferrite/carbon nanocomposites exhibited excellent cycling stability and rate performance derived from 2-D nanostructural characteristics. The synthetic procedure is simple, inexpensive, and scalable for mass production, and the highly ordered 2-D structure of these nanocomposites has great potential for many future applications. 相似文献
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Acar H Garifullin R Guler MO 《Langmuir : the ACS journal of surfaces and colloids》2011,27(3):1079-1084
Mineralized biological materials such as shells, skeleton, and teeth experience biomineralization. Biomimetic materials exploit the biomineralization process to form functional organic-inorganic hybrid nanostructures. In this work, we mimicked the biomineralization process by the de novo design of an amyloid-like peptide that self-assembles into nanofibers. Chemically active groups enhancing the affinity for metal ions were used to accumulate silicon and titanium precursors on the organic template. The self-assembly process and template effect were characterized by CD, FT-IR, UV-vis, fluorescence, rheology, TGA, SEM, and TEM. The self-assembled organic nanostructures were exploited as a template to form high-aspect-ratio 1-D silica and titania nanostructures by the addition of appropriate precursors. Herein, a new bottom-up approach was demonstrated to form silica and titania nanostructures that can yield wide opportunities to produce high-aspect-ratio inorganic nanostructures with high surface areas. The materials developed in this work have vast potential in the fields of catalysis and electronic materials. 相似文献
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具有纳米结构的导电聚合物因其诱人的应用前景越来越引起人们的重视。本文综述了聚苯胺、聚吡咯以及聚噻吩等导电聚合物的零维、一维、二维以及三维纳米结构的合成方法,并介绍了聚合物纳米结构的表征以及研究现状和应用前景。参考文献60篇。 相似文献
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以水热方法制备具有多级纳米结构的In2S3空心微球. 通过对不同反应时间产物的跟踪表征, 证明微球中空结构的形成归因于Ostwald ripening机理. 空心微球的壳层由In2S3的纳米粒子或纳米片组成, In2S3空心球的紫外可见光谱蓝移以及荧光光谱在约385 nm的强发射和364 nm的弱发射, 均显示了纳米尺度In2S3晶体的量子局限效应. 以不同的氨基酸作为晶体生长修饰剂, 可以选择性地制备不同表面形貌的In2S3空心微球, 显示了氨基酸的不同功能团在In2S3晶体生长过程中对表面形貌的控制作用. 相似文献
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Wanni Wang Mengli Zhao Chenyang Zhang Haisheng Qian 《Chemical record (New York, N.Y.)》2020,20(1):2-9
It's of great importance for construction of upconversion nanoparticles (UCNPs)/semiconductor heterostructures activated by near infrared light, which have gained worldwide research interests owing to important applications in photocatalysis, solar cells, nanomedicine, and etc. In this review, we highlight the synthetic strategies developed to fabricate upconversion nanoparticles based heterostructures, such as chemical epitaxial growth method, electrospinning technique, self‐assembly method, hydrothermal method, and etc. Numerous examples are given concerning the use of the strategies to fabricate various microstructures/nanostructures incorporated with UCNPs and semiconductors materials. The latest advances and perspectives in the synthetic strategies and preparation of this kind of composite nanostructures are made. 相似文献
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《Journal of Energy Chemistry》2019,(5)
Layered double hydroxides(LDHs), a class of anionic clays consisting of brucite-like host layers and interlayer anions, have been widely investigated in the last decade due to their promising applications in many areas such as catalysis, ion separation and adsorption. Owing to the highly tunable composition and uniform distribution of metal cations in the brucite-like layers, as well as the facile exchangeability of intercalated anions, LDHs can be modified and functionalized to form various nanostructures/composites through versatile processes such as anion intercalation and exfoliation, decoration of nanoparticles, selfassembly with other two-dimensional(2D) materials, and controlled growth on conductive supports(e.g.,nanowire arrays, nanotubes, 3D foams). In this article, we briefly review the recent advances on both the LDH nanostructures and functionalized composites toward the applications in energy conversion, especially for water oxidation. 相似文献