摘要
采用共沉淀法制备HoCrO3前驱体,将前驱体在不同条件下热处理得到铬酸钬纳米粉体。利用X射线衍射仪和扫描电子显微镜对HoCrO3纳米粉体的晶体结构和微观形貌进行了表征,对用HoCrO3纳米粉制作的元件进行气敏性能测试,研究了热处理条件对HoCrO3气敏元件气敏性能的影响。结果表明:所制备的HoCrO3粉体为纳米颗粒,平均粒径约为50nm,属于钙钛矿型复合氧化物;采用800℃保温2h制备的HoCrO3气敏元件对三甲胺气体具有较高的灵敏度、良好的选择性和稳定性;样品的检测限较低,对体积分数为1×10–7三甲胺的灵敏度为3。HoCrO3是检测三甲胺的一种很有应用前景的半导体气敏材料。
HoCrO3 precursors were prepared by a co-precipitation method and HoCrO3 nano powders were obtained through heattreating these precursors under different conditions. The crystal structure and micro-morphology of the samples were characterized by X-ray diffractometer and scanning electron microscope. The effects of heat treatment conditions on HoCrO3 gas-sensing properties were investigated via gas response tests of the sensors prepared by HoCrO3 powders. The results showed that the samples were nanocrystalline and its mean grain size is 50 nm or so and samples were perovskite type composite oxides. HoCrO3 calcined at 800 ℃ for 2 h had high sensitivity, selectivity and stability to trimethylamine （TMA）. The detection limit of the sensor to TMA was as low as 1 × 10^-7 （volume fraction） and the response could reach 3. So HoCrO3 is a kind of prospective semiconductor material to detect TMA.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2012年第6期826-831,共6页
Journal of The Chinese Ceramic Society
关键词
铬酸钬
三甲胺
气敏性能
共沉淀法
气体传感器
holmium chromite
trimethylamine
gas-sensing property
co-precipitation method
gas sensor
