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共沉淀法制备铬酸钬粉体及铬酸钬气敏元件的气敏性能
作者:储向峰1 朱小华1 葛秀涛2 董永平1 陈同云1 叶明富1 
单位:1. 安徽工业大学化学与化工学院 安徽 马鞍山 243002 2. 滁州学院化学与生命科学系 安徽 滁州 239000 
关键词:铬酸钬 三甲胺 气敏性能 共沉淀法 气体传感器 
分类号:O482;O614
出版年,卷(期):页码:2012,40(6):826-131
DOI:
摘要:

  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50 nm,属于钙钛矿型复合氧化物;采用800 ℃保温2 h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3HoCrO3是检测三甲胺的一种很有应用前景的半导体气敏材料

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Abstract: HoCrO3 precursors were prepared by a co-precipitation method and HoCrO3 nano powders were obtained throughheat- treating 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.

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作者简介:
第一作者:储向峰(1966—),男,博士,教授
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