Controlled Growth and Field‐Emission Properties of Cobalt Oxide Nanowalls
Controlled Growth and Field‐Emission Properties of Cobalt Oxide Nanowalls
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DOI：
10.1002/adma.200500322
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发表时间：
2005-07
影响因子：
29.4
通讯作者：
Ting Yu;Yanwu Zhu;X. J. Xu;Zexiang Shen;Ping-Ou Chen;Chwee Teck Lim;J. Thong;C. Sow
中科院分区：
文献类型：
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作者：
Ting Yu;Yanwu Zhu;X. J. Xu;Zexiang Shen;Ping-Ou Chen;Chwee Teck Lim;J. Thong;C. Sow
纳米材料作为纳米科学和纳米技术的基础，引起了研究人员的极大兴趣。由于其表面积大，可以暴露在气体环境中，二维（2D）纳米结构，如纳米墙[1]、纳米片[2]和纳米结或网络[3]，形成了一类重要的纳米结构材料，具有作为具有各种有趣功能的纳米级器件的重要组件的巨大潜力。因此，在过去的十年中，已经开发了许多用于合成此类纳米结构材料的技术。例如，利伯等人。开发了激光辅助气±液±固（VLS）生长方法；[4, 5] Lee等人系统地研究了氧化物辅助生长技术；[6]并通过蒸发适当的商业金属氧化物粉末制备了半导体氧化物纳米带。 [7]最近，通过在管式炉中直接加热金属粉末，成功合成了低熔点金属的金属氧化物纳米线。[8]氧化钴基材料具有许多应用，例如固态传感器、[9]多相催化剂、[10]电致变色器件、[11]以及作为太阳能吸收器。[12]此外，Co3O4纳米粒子表现出一些有趣的磁、光和传输特性。[13±15]已经报道了一些制造Co3O4纳米管和纳米纤维的方法。[16, 17]然而，据我们所知，还没有关于Co3O4二维纳米结构制备的报道。在本文中，我们报告了独立式、
Nanoscale materials, the basis of nanoscience and nanotechnology, have attracted a great deal of interest from researchers. Due to their large surface areas that can be exposed to gaseous environments, two-dimensional (2D) nanostructures such as nanowalls,[1] nanosheets,[2] and nanojunctions or networks [3] form an important category of nanostructured materials with great potential as important components for nanoscale devices with various interesting functions. Thus, in the past decade, many techniques have been developed for the synthesis of such nanostructured materials. For example, Lieber et al. developed the method of laser-assisted vapor±liquid±solid (VLS) growth;[4, 5] the oxide-assisted growth technique was systematically studied by Lee et al.;[6] and semiconducting oxide nanobelts were fabricated by evaporating the appropriate commercial metal oxide powder.[7] More recently, metal oxide nanowires of low-melting-point metals were successfully synthesized by directly heating metal powder in a tube furnace.[8]Cobalt oxide-based materials have many applications, such as in solid-state sensors,[9] heterogeneous catalysts,[10] electrochromic devices,[11] and as absorbers of solar energy.[12] Furthermore, Co3O4 nanoparticles show some interesting magnetic, optical, and transport properties.[13±15] A few methods of fabricating Co3O4 nanotubes and nanofibers have been reported.[16, 17] However, to the best of our knowledge, there has been no report on the preparation of Co3O4 2D nanostructures. In this paper, we report the growth of freestanding,