Quartz crystal microbalance (QCM) sensor for CH3SH gas by using polyelectrolyte-coated sol-gel film
Quartz crystal microbalance (QCM) sensor for CH3SH gas by using polyelectrolyte-coated sol-gel film
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DOI：
10.1016/j.snb.2004.12.122
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发表时间：
2005-07-22
影响因子：
8.4
通讯作者：
Shiratori, S
中科院分区：
文献类型：
--
作者：
Kikuchi, M;Shiratori, S
研究了一种用于QCM传感器电极的新型传感膜结构。有毒气体气敏装置要求传感器灵敏度高，响应速度快。增加传感膜的表面积可以有效地提高QCM传感器的灵敏度和响应速度，但增加聚合物薄膜的表面积是困难的。本文采用溶胶-凝胶法在QCM衬底上，在QCM电极与聚合物层之间涂覆Al2O3多孔膜，以增加聚合物层的表面积。通过这种方法，可以制备高孔隙度的聚合物传感膜，而无需高温处理。以聚乙烯亚胺（PEI）为聚合物层，对该传感器检测甲基硫醇（CH3SH）的性能进行了评价。有Al2O3多孔层的传感器比无无机层的传感器灵敏度高，响应速度快。Al2O3层增加了聚电解质层的表面积，从而提高了传感器的灵敏度。(c) 2005 Elsevier B.V.版权所有
A new structure of sensing film for QCM sensor electrode was investigated. Gas-sensing device for toxic gases requires high sensor sensitivity and quick response. Increasing the surface area of sensing film was effective to improve the sensor sensitivity and response speed of QCM sensors, however it is difficult to increase the surface area of polymeric film. In this paper, Al2O3 porous film was coated on QCM substrate by sol-gel method between the QCM electrode and polymeric layer in order to increase the surface area of polymeric layer. By using this manner, polymeric sensing films with high porosity can be fabricated without high-temperature treatment. The sensor was evaluated for the detection of methyl mercaptan (CH3SH) by using poly(ethylene imine) (PEI) as polymeric layer. The sensor with Al2O3 porous layer showed high sensitivity and quick response rather than the sensor without the inorganic layer. The Al2O3 layer worked for increasing the surface area of polyelectrolyte layer which resulted in the increasing of the sensor sensitivity. (c) 2005 Elsevier B.V. All rights reserved.