Quartz crystal ammonia gas sensor using a layer-by-layer self assembly thin film
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概要
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Nanoporous and hetero structure thin film consisted of weak polyelectrolytes and TiO_2 nanoparticles was fabricated by immersing the thin film assembled via layer-by-layer self assembly (LBL-SA) method in acidic water (pH 1.8) for 2min and neutral water for 10s subsequently. Thin films were deposited on a quartz crystal microbalance (QCM), silicon wafer and polystyrene substrates at room temperature. Ionic bonds of weak polyelectrolytes between poly (allylamine hydrochloride) and poly (acrylic acid) were broken in acidic water, which contributed to separate the agglomerated TiO_2 nanoparticles deposited on the surface of thin film. In order to evaluate the gas sensitivity of hetero structure thin film with a high surface area, the frequency shifts of a QCM were measured as functions of the concentration of ammonia gas and relative humidity. This film showed a very fast response and recovery to ammonia gas. As the concentration of gas and relative humidity were increased, the frequency shifts of a QCM were also increased gradually.
- 社団法人電子情報通信学会の論文
- 2003-08-22
著者
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Kim Jin
Department Of Anatomy And Cell Biology College Of Veterinary Medicine And Bk21 Program For Veterinar
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Kim Jin
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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SHIRATORI Seimei
Department of Applied Physics and Physico-informatics, Keio University
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Shiratori Seimei
Department Of Applied Physics & Physico-informatics Faculty Of Science & Technology Keio Uni
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Shiratori Seimei
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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