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響應(yīng)三甲胺氣體低阻TiO2基氣體傳感器研制

發(fā)布時間:2008/5/29 0:00:00 訪問次數(shù):339

孫海波,王強,裴素華,孫振翠
(山東師范大學(xué)半導(dǎo)體研究所,山東 濟南 250014)
摘要:二氧化鈦是一種良好的響應(yīng)三甲胺氣體的敏感材料,然而用它做成傳感器后存在一個明顯的缺點:阻值太高。文中采用不同氣氛熱退火和摻雜方法來提高tio2基材料的電導(dǎo)率,從而制成一種新型低阻敏感元件,對三甲胺靈敏度高、選擇性好。

關(guān)鍵詞:二氧化鈦;熱退火;摻雜;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. however,there is an important problem that electrical resistance of the tio2based 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 lowpowder 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

        孫海波,王強,裴素華,孫振翠
        (山東師范大學(xué)半導(dǎo)體研究所,山東 濟南 250014)
        摘要:二氧化鈦是一種良好的響應(yīng)三甲胺氣體的敏感材料,然而用它做成傳感器后存在一個明顯的缺點:阻值太高。文中采用不同氣氛熱退火和摻雜方法來提高tio2基材料的電導(dǎo)率,從而制成一種新型低阻敏感元件,對三甲胺靈敏度高、選擇性好。

        關(guān)鍵詞:二氧化鈦;熱退火;摻雜;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. however,there is an important problem that electrical resistance of the tio2based 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 lowpowder 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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