The Effect of the Type of Polycation Used in Mica Nanocomposite Thin Films Prepared by Layer-by-Layer Technique on Low-Humidity Sensing

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题名:	The Effect of the Type of Polycation Used in Mica Nanocomposite Thin Films Prepared by Layer-by-Layer Technique on Low-Humidity Sensing
作者:	Su, PG (Su, Pi-Guey) Shie, WC (Shie, Wei-Chen)
贡献者:	化材系
关键词:	FIELD-EFFECT TRANSISTORS ULTRATHIN MULTILAYER MONTMORILLONITE SENSOR
日期:	2010-12
上传时间:	2011-12-08 14:52:58 (UTC+8)
摘要:	In the current work, layer-by-layer self-assembled mica and cationic polyelectrolyte (poly(allylamine hydrochloride)) (PAH) or poly(diallyldimethylammonium chloride) (PDDA) were synthesized on a quartz-crystal microbalance (QCM) for low-humidity sensing applications. The surface characteristics of the thin films were studied for various assembly conditions. The thin films were characterized using QCM and by atomic force microscopy (AFM). The surface roughness and thickness of the mica/PDDA thin film both exceeded that of the mica/PAH thin film. The effects of the polycations type, polycations concentration and the number of layers on the low-humidity sensing properties (sensitivity) of the sensors were investigated. Additionally, other low-humidity sensing properties such as sensing linearity, response and recovery times and reproducibility were studied. The mica/PDDA multilayered thin film had the highest sensitivity (0.930-Delta Hz/Delta ppm(v) at 42.9 ppm(v)) and linearity and a short response time (12 s at 92.2 ppm(v)).
显示于类别:	[化學工程與材料工程學系暨碩士班] 期刊論文

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