Preparation of MoO2 sub-micro scale sheets and their optical properties
Preparation of MoO2 sub-micro scale sheets and their optical properties
复制标题
DOI：
10.1016/j.jallcom.2011.01.089
复制
发表时间：
2011-06
影响因子：
6.2
通讯作者：
Xinli Liu;Yuehui He;Shiliang Wang;Quan Zhang
中科院分区：
文献类型：
--
作者：
Xinli Liu;Yuehui He;Shiliang Wang;Quan Zhang
MoO2sub-micro sheets have been synthesized in a large scale on silicon substrate with MoO3and C powders as raw materials using a novel chemical vapour deposition method. The lengths and widths of MoO2sheets are in the range of several to dozens micrometers, and the thickness of MoO2sub-micro sheets is ∼200nm. Transmission electron microscopy and high-resolution electron microscopy show that the MoO2sheets are of single crystal with a monoclinic structure. The sheets exhibit fluorescent emissions at 304.4, 343.5 and 350.6nm when the 220nm light excitation is applied at room temperature, and the emissions result from some defects and the electron transition between valence band and conduction band. UV–vis spectrum shows the MoO2sub-micro sheets have absorption peaks between 200and 300nm and the emissions should be attributed to the defect states of MoO2. Furthermore, the band-gap is estimated to be approximately 4.22eV. The growth mechanism of the two-dimensional MoO2sub-micro scale sheets is also discussed.
