|
|
★
wypward(金币+1):谢谢参与 2010-09-29 22:01:23
lwb870525(金币+20, 翻译EPI+1):谢了。 2010-09-30 11:38:55
气体传感器主要用于各种气体的检测，尤其是环境中的有毒、有害气体。60 年代初人们开始发现金属氧化物半导体材料具有气敏特性，相继开发并获得应用的是一些具有n型半导体性质的金属氧化物气敏材料，如SnO2、ZnO、TiO2、Fe2O3、WO3、In2O3、Cr2O3、Cu2O 等。二氧化锡作为一种重要的气敏材料已获得广泛应用，但目前仍是气敏材料的研究热点，这是因为二氧化锡具有灵敏度高、廉价易得、高温性能稳定等难以替代的优点。本文以SnC14.5H20 为原料，采用溶胶—凝胶法合成了对甲醛气体( HCHO) 敏感的纳米晶SnO2材料，并以其为气敏材料制成了旁热式烧结敏感元件,对甲醛气敏性能进行了测试。测试结果表明,该气敏元件在工作温度为360℃时对甲醛气体有很好的敏感性能。
Gas sensors are mainly useful for detection of various gases, especially those toxic and hazardous in the environment. Since the early 1960s, people have begun to realize that metallic oxide semiconductors are sensitive to gases, and developed some n-type metallic oxides as gas-sensitive materials including SnO2、ZnO、TiO2、Fe2O3、WO3、In2O3、Cr2O3、Cu2O and so on. As an important gas sensitive material, SnO2 has found extensive applications in the past, but is still a hot topic of the research regarding gas sensitive materials. This is because SnO2 has indispensable advantages such as high sensitivity, low cost and good availability, and high thermal ability. In this work, HCHO sensitive SnO2 nanocrystal was synthesized from SnC14.5H20 via the sol-gel method, and was used as a gas sensitive material to fabricate an indirect heat mode calcination-sensitive element. Our characterization shows that the fabricated gas sensor is highly sensitive to HCHO gas at a temperature as high as 360C. |
|
回复此楼