Catalytic membrane sensors.: A thin film modified H2 resistive sensor for multi-molecular detection
Catalytic membrane sensors.: A thin film modified H2 resistive sensor for multi-molecular detection
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DOI：
10.1080/02603599908021444
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发表时间：
1999-01-01
影响因子：
5.4
通讯作者：
Hughes, RC
中科院分区：
文献类型：
--
作者：
Boyle, TJ;Brinker, CJ;Hughes, RC
一种所谓的“催化膜传感器”（CMS）正在开发中，通过用一系列薄膜对其进行改性来赋予现有传感器的表面选择性和反应性。所提出的“双金属型”改性涉及在Pd/Ni电阻H-2传感器上的两个尺寸选择性溶胶-凝胶层之间沉积催化剂层。催化剂的作用是通过脱氢机制将有机材料转化为H-2和有机副产物。膜的作用是通过分析物和转化的产物流的分子筛来赋予化学特异性，以及控制对底层Pd/Ni传感器的访问。“三明治”修饰将介导传感器响应并避免潜在的中毒效应。最终，包含不同催化剂和膜的这些CMS元件的阵列将通过模式识别方法进一步提高选择性和特异性。本报告详细介绍了各种薄膜溶液的合成（即，催化剂前体、溶胶-凝胶溶液）、通过离子交换生成催化剂、双醇盐与标准催化剂前体的比较以及生成CMS所需的处理。本文还详细介绍了新的和令人惊讶的实验数据有关增加的选择性和耐久性观察溶胶-凝胶改性的H-2气敏电阻。CMS组件作为多分子检测器的实用性将在稍后报告。
A so-called "catalytic membrane sensor" (CMS) is being developed to impart selectivity and reactivity to the surface of an existing sensor by modifying it with a series of thin films. The proposed "sandwich-type" modification involves deposition of a catalyst layer between two size selective sol-gel layers on a Pd/Ni resistive H-2 sensor. The role of the catalyst is to convert organic materials to H-2 and organic by-products by a dehydrogenation mechanism. The roles of the membranes are to impart chemical specificity by molecular sieving of the analyte and the converted product streams as well as to control access to the underlying Pd/Ni sensor. The "sandwich" modification will mediate the sensor response and avoid potential poisoning effects. Ultimately, an array of these CMS elements encompassing different catalysts and membranes will further enable improvements in selectivity and specificity via pattern recognition methodologies. This report details the synthesis of the various thin film solutions (i.e., catalyst precursors, sol-gel solution), the generation of the catalyst through ion-exchange, a comparison of the double alkoxide versus standard catalyst precursors, and the processing required to generate a CMS. This paper also details the novel and surprising experimental data concerning the increased selectivity and durability observed for the sol-gel modified H-2 gas sensing resistors. The utility of the CMS component as a multi-molecular detector will be reported later.