High Surface Area Ceramic Semiconductor SnO&lt;sub&gt;2&lt;/sub&gt; Gas Sensor

Hsieh, Po-Fan; Ma, Chao; Wu, Xing; Sun, Xiao; Li, Heng De

doi:10.4028/www.scientific.net/kem.224-226.225

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“…Note that the obtained sensor layersalthough a certain decrease of the BET surface was observednevertheless exhibit one of the highest specific surfaces obtained for sintered SnO 2 nanoparticles . Such specific surfaces were yet only gained by thermal decomposition of organic−inorganic hybrid precursors such as tin acetates, alkoxides, or acetylacetonates. − In contrast to these precursors, however, spin-coating or drop-casting of nanoparticle suspensions is much more straightforward, aiming at low-cost, easy-to-fabricate sensors.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale SnO₂ Hollow Spheres and Their Application as a Gas-Sensing Material

et al. 2010

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The use of nanoscale SnO2 hollow spheres as a redox-active sensor is investigated. The underlying hollow spheres are prepared via a microemulsion approach and exhibit an outer diameter of about 15−25 nm, a highly crystalline shell with a thickness of 3−5 nm and an inner cavity of 10−20 nm in diameter. Subsequent to materials characterization based on SEM, STEM, TEM, IR, TG, BET, and XRD the applicability of as-prepared hollow spheres as highly porous layers in sensor operation is tested. Accordingly, SnO2 hollow spheres deposited on common sensor substrates show a good response to CO in a concentration range of 50 to 300 ppm. Moreover, the material turned out to be useful as a model system to study the conduction model of a porous layer with small grains.

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Section: Resultsmentioning

confidence: 99%