Solid-state chemical synthesis and xylene-sensing properties of α-MoO3 arrays assembled by nanoplates
Solid-state chemical synthesis and xylene-sensing properties of α-MoO3 arrays assembled by nanoplates
复制标题
纳米片组装的α - MoO₃阵列的固相化学合成及其对二甲苯的传感性能
DOI：
10.1016/j.snb.2016.11.081
复制
发表时间：
2017-04
影响因子：
8.4
通讯作者：
Haiyu Qin;Yali Cao;Jing Xie;Hui Xu;Dianzeng Jia
中科院分区：
文献类型：
--
作者：
Haiyu Qin;Yali Cao;Jing Xie;Hui Xu;Dianzeng Jia
利用简单的固相化学反应合成了由纳米片构成的特殊α-MoO 3阵列。通过X射线衍射、傅里叶变换红外光谱、透射电子显微镜、场发射扫描电子显微镜、高分辨透射电子显微镜和Brunauer-Emmett-Teller分析对所得产物进行了表征。研究了产物对有毒气体的气敏特性。利用二维纳米片的晶面择优取向和对特定晶面的适当保护，原位自组装得到了高一致性的α-MoO 3阵列。该阵列在较宽的浓度范围内对二甲苯表现出良好的响应，在370 °C的最佳工作温度下，对100 ppm二甲苯的响应值达到19.2，是未组装的α-MoO 3纳米片的3倍。这种良好的二甲苯响应归因于具有高反应活性的活性晶面的优先暴露以及阵列相对较大的比表面积，这提供了更多的活性位点并吸附了更多的氧分子用于与二甲苯分子的反应。α-MoO 3纳米片阵列的优异响应特性使其成为一种很好的二甲苯气敏材料。
The special α-MoO3arrays constructed from nanoplates were synthesized using a simple solid-state chemical reaction. The obtained products were characterized by x-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy and Brunauer-Emmett-Teller analysis. Gas-sensing characteristics of the products toward noxious gases were investigated. The α-MoO3arrays with high consistency were self-assembled in-situ by two-dimensional nanoplates due to the crystal face preferred orientation and the appropriate protection for specific crystal surface. The arrays exhibited good response to xylene in a wide range of concentrations, and the response value to 100 ppm xylene reached 19.2 at the optimum operation temperature of 370 °C, which is three times higher than that of unassembled α-MoO3nanoplates. The good xylene response was attributed to the preferential exposure of the active crystal faces with high reactivity and the relatively large specific surface area of arrays, which provided more active sites and adsorbed more oxygen molecules for reaction with xylene molecules. The excellent response properties of the α-MoO3nanoplates arrays make it a good candidate as a gas-sensing material for xylene detection.