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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 coprecipitation method, and the precursors were heat-treated under different conditions to obtain holmium chromate nanoparticles. The crystal structure and morphology of HoCrO3 nano-powders were characterized by X-ray diffraction and scanning electron microscope. The gas sensitivities of HoCrO3 nano-powders were tested. The effects of heat treatment conditions on the gas sensitivities of HoCrO3 gas sensors The impact of performance. The results show that the prepared HoCrO3 powder is a nanoparticle with an average particle size of about 50 nm and belongs to the perovskite type composite oxide. The HoCrO3 gas sensor prepared by keeping the temperature at 800 ° C. for 2 h has high sensitivity to the trimethylamine gas, Good selectivity and stability; the detection limit of the sample is low, and the sensitivity to the volume fraction of 1 × 10 -7 trimethylamine is 3. HoCrO3 is a promising semiconductor gas sensing material for the detection of trimethylamine.