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Electrical Behavior of Semiconducting Nanopowders Versus Environment

机译：半导体纳米粉末与环境的电行为

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When applied to the study of semiconducting nanosized particles, Fourier transform infrared spectroscopy allows the simultaneous analysis of the chemical reactions occurring at the nanoparticle surface and the resultant variations of the electrical conductivity. This technique has been used to compare the sensing potentiality of three semiconductors (tin oxide, indium oxide and tungsten oxide nanoparticles) before they are integrated in the fabrication process of actual gas sensors. It has been found that the sensitivity to CO of tin oxide and indium oxide nanoparticles is fairly good whereas that of tungsten oxide is quasi nil. However, tungsten oxide, like indium oxide, is very sensitive to oxygen and reducing treatments. The presence of humidity irreversibly affects the response of tin oxide to CO and oxygen, whereas that of indium and tungsten oxides to both gases seems to be relatively independent from the moisture content. It is generally observed that a higher operating temperature leads to a more stable baseline and a faster response. Moreover, the formation of surface carbonate groups observed in several cases under CO adsorption does not imply a larger response, thus confirming that the carbonate formation is not a significant factor in the CO detection mechanism.
机译：当应用于半导体纳米颗粒的研究时，傅里叶变换红外光谱法可以同时分析在纳米颗粒表面发生的化学反应以及由此产生的电导率变化。该技术已被用于比较三种半导体（氧化锡，氧化铟和氧化钨纳米粒子）在集成到实际气体传感器的制造过程中之前的感应电势。已经发现，氧化锡和氧化铟纳米粒子对CO的敏感性相当好，而氧化钨的敏感性为零。但是，氧化钨，像氧化铟一样，对氧气和还原处理非常敏感。湿度的存在不可逆地影响氧化锡对CO和氧气的响应，而铟和氧化钨对两种气体的响应似乎与水分含量相对无关。通常观察到，较高的工作温度导致更稳定的基线和更快的响应。而且，在几种情况下，在CO吸附下观察到的表面碳酸酯基团的形成并不意味着有较大的响应，因此证实碳酸酯的形成不是CO检测机理中的重要因素。

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