氧化铟纳米棒的气敏特性

以非离子表面活性剂烷基苯酚聚氧乙烯醚OP-10为形貌控制剂合成In2O3纳米棒.用热重-差示扫描量热法、X射线衍射和透射电镜对In2O3纳米棒的热分解过程、晶体结构和微观形貌进行表征.对纳米棒制得的气敏元件进行气敏性能测试,同时用扫描电子显微镜及比表面积和孔隙度分析仪对元件的表面形貌和材料的介孔结构进行了分析.结果表明:制得的In2O3为立方晶型的纳米棒,直径约20 nm,长度约120 nm.与In2O3纳米颗粒气敏性能相比,In2O3 纳米棒对三甲胺具有更高的灵敏度和选择性.用In2O3纳米棒制的气敏元件对三甲胺在一定的浓度范围内的灵敏度与浓度呈现良好的双对数线性关系.棒状材料中形成的大量介孔对气敏性能的提高有着重要的作用.

GAS SENSITIVITY PROPERTY OF In2O3 NANORODS

Indium oxide nanorods were synthesized by using non-ionic surfactant polyethoxylated alkylphenols OP-10 as a structure-directing agent.The decomposition,crystal form and micro-morphology of the nanorods were characterized by thermogravimetry-differential scanning calorimetry,X-ray diffraction and transmission electron microscopy.Gas sensitivity tests of the sensors prepared by nanorods were carried out.Scanning electron microscopy and surface and pore structure analysis were also used to analyze the surface morphology and mesostructure of the sensors.The results show that the products synthesized are In2O3 nanorods and have a cubic crystal structure with a diameter and length around 20 nm and 120 nm respectively.The sensor prepared by In2O3 nanorods has higher sensitivity and selectivity to trimethylamine(TMA)than that of indium oxide nanoparticles.The measurement results also show that gas sensors based on In2O3 nanorods provide a good log-log linear relation to TMA in a certain concentration between sensitivity and concentration.Mesopores formed in the nanorods played an important role in the gas sensing properties of nanorods materials.