| 基于p-n导电转变的二氧化钛对CO高温感应性能的研究 |
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| 引用本文： | 张建伟,孙芳洁,李晓干,余隽,王兢,闫卫平,唐祯安.基于p-n导电转变的二氧化钛对CO高温感应性能的研究[J].无机材料学报,2012(5):458-462. |
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| 作者姓名： | 张建伟 孙芳洁 李晓干 余隽 王兢 闫卫平 唐祯安 |
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| 作者单位： | 大连理工大学电子科学与技术学院,传感技术研究所 |
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| 基金项目： | 国家自然科学基金(61001054,61131004);中央高校基本科研业务费~~ |
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| 摘 要： | 研究了以金红石TiO2半导体材料为气敏材料的一氧化碳(CO)传感器在600~800℃之间的气敏性能.该传感器在测试温度600~700℃时对20~2000 mg/m3的CO(载气为氮氧混合物且氧气含量为2%~25%)表现出p型电导行为.随着测试温度从600℃升高至700℃,传感器的感应强度迅速下降到接近于1.当温度升高到750℃以上时,传感器再次出现对CO的感应强度并且表现出n型导电行为.随着温度升高到800℃,传感器对CO的n型感应信号进一步增强,表现出良好的高温感应性能.利用交流阻抗谱仪对该TiO2敏感材料的高温导电特性进行了研究,并初步讨论了TiO2在高温下对CO还原气氛的诱导导电性能变化的原因.
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| 关 键 词： | TiO2 p-n导电行为转变 高温CO传感器 交流阻抗谱 |
CO Sensing Properties of TiO2 Based on the p-n Transition Induced by Carbon Monoxide at High Temperatures |
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| ZHANG Jian-Wei,SUN Fang-Jie,LI Xiao-Gan,YU Jun,WANG Jing,YAN Wei-Ping,TANG Zhen-An.CO Sensing Properties of TiO2 Based on the p-n Transition Induced by Carbon Monoxide at High Temperatures[J].Journal of Inorganic Materials,2012(5):458-462. |
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| Authors: | ZHANG Jian-Wei SUN Fang-Jie LI Xiao-Gan YU Jun WANG Jing YAN Wei-Ping TANG Zhen-An |
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| Affiliation: | (Institute of Sensor technologies,School of Electronic Science and Technology,Dalian University of Technology,Dalian 116024,China) |
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| Abstract: | Rutile TiO2 based semiconductor-type sensors were investigated for sensing CO within the temperature range from 600℃ to 800℃.The sensor showed p-type behavior to CO(20 2000 mg/m3) when tested in oxygen concentrations varied from 10% to 2% between 600℃ and 700℃.The response of the sensor decreased significantly as the temperature increased from 600℃ to 700℃ approaching to one.However,when the temperature was above 750℃,an n-type behavior of the sensor to CO was observed.This n-type response further increased when the temperature increased to 800℃.AC impedance was employed to study the conduction behaviors of the TiO2thick film in both varied oxygen concentrations and CO environment at 800℃.The results indicate that the change of the oxygen ion/vacancy concentrations in the bulk TiO2is probably the reason for the p-n conduction transition induced by CO. |
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| Keywords: | TiO2 p-n conduction transition high temperature CO sensors impedance spectrum |
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