响应三甲胺气体低阻TiO2基气体传感器研制
发布时间:2008/5/29 0:00:00 访问次数:336
孙海波,王强,裴素华,孙振翠 |
(山东师范大学半导体研究所,山东 济南 250014) |
摘要:二氧化钛是一种良好的响应三甲胺气体的敏感材料,然而用它做成传感器后存在一个明显的缺点:阻值太高。文中采用不同气氛热退火和掺杂方法来提高tio2基材料的电导率,从而制成一种新型低阻敏感元件,对三甲胺灵敏度高、选择性好。 关键词:二氧化钛;热退火;掺杂;三甲胺 1 introduction the detection of food freshness is important in various fields of food industry. as for fish freshness,it is generally detected by calculating the percentage of inosine and hypoxanthine among the adenosine triphosphate(atp)related compounds in fish muscle at home[1]. but the method requires a lot of time and efforts. it is reported[2]that freshness of fish can be determined by detecting the concentration changes of trimethylamine(tma)evolved from dead fish. in 1988,egashira et al. reported[3,4]that a sensor element,made from sintered tio2 powder mixed with ru,was very sensitive to tma,and could be used to detect the fish freshness. however,there is an important problem that electrical resistance of the tio2based elements is extremely high:109~1010ω at their operating temperature. it needs complicated and expensive electrical circuits or instrument to measure such high resistance,which greatly impeded the development of it towards miniaturization and lowpowder consumption.
in this paper,a new type of gas sensor with high sensitivity to tma was reported,whose conductivity is relatively high by annealing and adding method. 2 experimental 2.1 materials the analytical pure tio2 sensor materials without any additives were prepared by annealing at 1000 ℃ for 6 h in the ambience of o2(600 ml/min)and n2(600 ml/min)respectively in high temperature furnace,to make comparison to the influence of different ambience to resistance of elements. the above mentioned materials are chosen as optimal base and added with in,nb2o5 and v2o5 with different proportion of quantity to form the sensitive materials,in order to analyze the effects of it to resistance. 2.2 sensitive elements fabrication the different sensitive materials were grinded in an agate mortar for 4~5 hours to ensure the additives and tio2 are fully mixed. it was mixed with a smal
孙海波,王强,裴素华,孙振翠 | (山东师范大学半导体研究所,山东 济南 250014) | 摘要:二氧化钛是一种良好的响应三甲胺气体的敏感材料,然而用它做成传感器后存在一个明显的缺点:阻值太高。文中采用不同气氛热退火和掺杂方法来提高tio2基材料的电导率,从而制成一种新型低阻敏感元件,对三甲胺灵敏度高、选择性好。 关键词:二氧化钛;热退火;掺杂;三甲胺 1 introduction the detection of food freshness is important in various fields of food industry. as for fish freshness,it is generally detected by calculating the percentage of inosine and hypoxanthine among the adenosine triphosphate(atp)related compounds in fish muscle at home[1]. but the method requires a lot of time and efforts. it is reported[2]that freshness of fish can be determined by detecting the concentration changes of trimethylamine(tma)evolved from dead fish. in 1988,egashira et al. reported[3,4]that a sensor element,made from sintered tio2 powder mixed with ru,was very sensitive to tma,and could be used to detect the fish freshness. however,there is an important problem that electrical resistance of the tio2based elements is extremely high:109~1010ω at their operating temperature. it needs complicated and expensive electrical circuits or instrument to measure such high resistance,which greatly impeded the development of it towards miniaturization and lowpowder consumption.
in this paper,a new type of gas sensor with high sensitivity to tma was reported,whose conductivity is relatively high by annealing and adding method. 2 experimental 2.1 materials the analytical pure tio2 sensor materials without any additives were prepared by annealing at 1000 ℃ for 6 h in the ambience of o2(600 ml/min)and n2(600 ml/min)respectively in high temperature furnace,to make comparison to the influence of different ambience to resistance of elements. the above mentioned materials are chosen as optimal base and added with in,nb2o5 and v2o5 with different proportion of quantity to form the sensitive materials,in order to analyze the effects of it to resistance. 2.2 sensitive elements fabrication the different sensitive materials were grinded in an agate mortar for 4~5 hours to ensure the additives and tio2 are fully mixed. it was mixed with a smal
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