Controlled Cobalt Oxide from Two-Dimensional Films to One-Dimensional Nanorods and Zero-Dimensional Nanoparticles: Morphology-Dependent Optical Carbon Monoxide Gas-Sensing Properties
Controlled Cobalt Oxide from Two-Dimensional Films to One-Dimensional Nanorods and Zero-Dimensional Nanoparticles: Morphology-Dependent Optical Carbon Monoxide Gas-Sensing Properties
复制标题
DOI：
10.1021/jp905715g
复制
发表时间：
2009-08
影响因子：
3.7
通讯作者：
Liang Li;T. Sasaki;Y. Shimizu;N. Koshizaki
中科院分区：
文献类型：
--
作者：
Liang Li;T. Sasaki;Y. Shimizu;N. Koshizaki
采用斜角沉积和脉冲激光沉积相结合的方法制备了具有可控纳米结构的钴氧化物。通过控制衬底的倾斜角度和反应室中的氧气压力，所制备的钴氧化物呈现出从二维（2D）致密柱状薄膜到一维（1D）纳米棒、纳米棒和纳米颗粒的复合物以及零维（0D）纳米颗粒的结构演变。详细研究了其生长机理。所制造的钴氧化物纳米结构表现出改善的光学一氧化碳（CO）气体传感性能，包括灵敏度，响应和恢复时间，以及随着尺寸减小的稳定性，由于高的表面积与体积比，孔结构，和小的颗粒尺寸。
A combined process of oblique angle deposition and pulsed laser deposition was developed to fabricate cobalt oxide with controlled nanostructures. By the manipulation of the tilt angles of substrates and the oxygen pressures in a reaction chamber, the fabricated cobalt oxide exhibited a structural evolution from two-dimensional (2D) compact and columnar films to one-dimensional (1D) nanorods, composites of nanorods and nanoparticles, and zero-dimensional (0D) nanoparticles. The growth mechanism was examined in detail. The fabricated cobalt oxide nanostructures demonstrated an improved optical carbon monoxide (CO) gas-sensing performance, including sensitivity, response and recovery time, and stability with the decreased dimension, owing to the high surface-to-volume ratio, pore structure, and small particle size.