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lwb870525(½ð±Ò+20, ·­ÒëEPI+1):лÁË¡£ 2010-09-30 11:38:55
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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.
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