LOU Xiang-dong, ZHANG Ning, WANG Xiao-bing, et al. Gas sensing materials of ZnFe2O4 prepared by benzoic acid sol-gel method[J]. 2009, 28(2): 53-55. DOI: 10.13873/j.1000-97872009.02.007.
苯甲酸溶胶—凝胶法制备ZnFe2O4气敏材料
摘要
以苯甲酸为凝胶剂
用溶胶—凝胶法制备ZnFe2O4粉体
通过XRD
SEM等手段对粉体的晶体结构、形貌等进行表征
结果表明:产物为尖晶石结构
颗粒分布比较均匀。采用静态配气法测定材料的气敏性能
发现以ZnFe2O4为基体的气敏元件的最佳煅烧温度为700℃
在175℃的工作温度下对100×10-6H2S气体的灵敏度高达126
并具有选择性好
响应—恢复时间短
稳定性好等特点。
Abstract
ZnFe2O4 powder is prepared by a sol-gel method with benzoic acid as coagulator.Its structure and morphology are analyzed by XRD and SEM.The results show that the powder of ZnFe2O4 is spinel-type and has good dispersity.The gas sensing characteristics of the materials are tested in static slate.It has optimal calcining temperature 700 ℃ and has a high sensitivity to 100×10-6 H2S as high as 126 at lower working temperature 175 ℃.The sensor has satisfactory selectivity
quickly response and recover times and good stability.
关键词
Keywords
references
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