摘要：近年来，高性能薄膜基气体传感器的研制备受关注，所涉及的涂层化学已经成为物理化学学科发展的一个热点。传感因分析物与敏感层（涂层）物质相互作用引起薄膜特定静态及动态物理量变化而实现，因此，薄膜传感性能势必受到敏感层物质种类和敏感层微纳结构等因素影响。就薄膜基荧光传感而言，荧光敏感物质的结构和性质对薄膜传感性能起着至关重要的作用。同时，因毛细凝结、色谱效应、尺寸效应、分子间相互作用等因素的存在，敏感层微观结构也极大地影响着薄膜的传感性能。本文结合课题组近期研究工作，简要讨论薄膜基荧光气体传感器研究中的涂层化学基本问题，以及相关薄膜基荧光传感器在隐藏爆炸物、毒品、挥发性有机污染物检测/监测等方面的应用探索。在此基础上，展望薄膜基荧光气体传感器的发展前景和所面临的主要挑战。

关键词：涂层；薄膜基荧光传感器；气体传感；构效关系

Abstract: The adlayer chemistry has been a hot topic in Physical Chemistry in the past few decades. Lots of attention has been paid to the development of high-performance film-based gas sensors, and tremendous progress has been achieved. Relative signal changes including static and dynamic characteristics related to the surface absorption, interaction between the analytes and the sensing adlayer, also the desorption kinetics in the absence and presence of the targeting gaseous analytes are largely used to determine the sensing process. As revealed earlier, there are a number of factors that determines the sensing behavior of a film, which include, at least, 1) the suitability of the employed sensing fluorophore, which is important as it ultimately determines the effectiveness of a sensing process, 2) the structure of the fluorescent adlayer of the film, another important factor as it highly determines the efficiency of mass transfer, which is a pre-requirement for efficient and reversible sensing, and 3) the chemical nature and the surface structure of the substrate as they could affect the sensing performance of the film via screening or enriching analyte molecules. Based on the recent progress in our group, this article briefly reviews the key points for the interactions between the gaseous analytes and the adlayer, also their applications in the vapor phase detection of explosives, illicit drugs, and volatile organic contaminates based on the film-based fluorescent gas sensors. Finally, we will offer some insights on future directions and challenges for the film-based sensors in gas sensing.

Key Words: adlayer; film-based fluorescent sensor; gas sensing; structure-property relationship