Development of high performance holographic gas-sensoring system and its application to the environmental monitoring.

目前的研究项目是通过理论和实验两种方法，旨在开发一种高性能全息气体传感系统及其在环境监测中的应用。本文研究的主要问题和结果如下：1)全息气体传感器发展的基础研究为了建立一种耐用、高性能的全息传感器，通过在金属和半导体衬底上制作全息图，期望对选定的样品气体表现出特定的亲和力，研究了理论和实验方法。2)金属氧化物基全息图表面过程的原位观察采用全息光栅的方法研究了干涉紫外线照射下TiO2薄膜光催化剂和MoO3光致变色薄膜的光致表面过程。本文认为，光催化作用下的反应物和/或反应中间体的微观分布可以通过相应的表面折射率的空间调制来探测。根据实验结果，提出了对亚单层吸附剂的表面过程特征参数如动力学和表面传质系数的估计。3)混合衬底上全息传感器对样品气体的选择性检测。在混合衬底（如金膜和二氧化二氮膜）上安装全息气体传感系统的光子计数系统，对样品气体进行了检测。结果表明，混合系统对气体传感具有一定的选择性。

The present research project was, by both theoretical and experimental approaches, aimed at the development of a high performance holografic gas-sensoring system and its application to the environmental monitoring. The major issues studied and the results obtained are as follows :1) Basic study for the development of holographic gas sensorsIn order to establish a durable and high performance holographic sensor, theoretical and experimental approachs were studied by using those holograms fabricated on the metal and semiconducting substrates which were expected to show specific affinity to selected sample gases.2) In situ observation of the surface processes at a metal oxide based hologramHolographic grating method was undertaken in order to study the photoinduced surface processes as modeled at TiO2 thin-film photocatalyst and at MoO3 photochromic thin films under the interfering uv-illumination. It was suggested that the microscopic distribution of reactants and/or reaction intermediates upon photocatalysis can be probed in terms of the corresponding spacial modulation of the surface refractive index. Based on the experimental results those characteristic parameters for the surface processes such as kinetics and the surface mass transfer coefficient were suggested to be estimated even for the submonolayer adsorbates.3) Selective detection of a sample gas with a holographic sensor on a hybrid substrateA photon-counting system equipped with the holographic gas-sensoring system based on a hybridized substrate such as gold and tinoxide films were demonstrated to detect sample gases. The result suggested that the hybrid system has possible selectivity for the gas sensoring.