氧化铟纳米线的水热-退火合成及其NO_2气敏性能研究  

Synthesis and NO_2 Gas-Sensing Properties of In_2O_3 Nanowires via a Hydrothermal-Annealing Route

作　　者：程知萱[1] 许鹏程[1] 潘庆谊[1] 徐甲强[1] 向群[1] 董晓雯[1] 

机构地区：[1]上海大学理学院化学系,上海200444

出　　处：《传感技术学报》2008年第1期32-35,共4页Chinese Journal of Sensors and Actuators

基　　金：上海市教委资助资金(07ZZ12);上海市自然科学基金资助(07ZR14039)

摘　　要：以InCl3.4H2O、草酸和氢氧化钠为原料,采用水热-退火路径,合成出了In2O3纳米线。X射线粉末衍射(XRD)和扫描电子显微镜(SEM)表征结果表明:合成产物为立方相的In2O3纳米线,其直径约为30-50nm,长径比超过40。气敏性能测试结果表明,以该法合成的In2O3纳米线对NO2灵敏度高,选择性好,响应恢复快,可以检测1ppm(i.e.×10-6)的NO2,是一种应用前景良好的NO2敏感材料。In2O3 nanowires were synthesized via a novel hydrothermal-annealing route, using InCl3· 4H2O, oxalic acid and NaOH as raw materials. The as-synthesized products were characterized by powder X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The characterization indicated that the assynthesized products were In2O3 nanowires with the cubic structure. The diameters of these nanowires were about 30-50 nm, and the aspect-ratio is more than 40. The gas-sensing measurements show that the gas sensors based on In2O3 nanowires have a high sensitivity and selectivity toward NO2. It can detect NO2 even down to 1 ppm（i, e. × 10^-6）. These gas sensors also have a short response and recovery time. Thus these as-synthesized In2O3 nanowires can be using as a promising NO2-sensing material.

关 键 词：气体传感器 纳米线 水热 氧化铟 二氧化氮 

分 类 号：O649[理学—物理化学] TP212[理学—化学]