物理化学学报 >> 2020, Vol. 36 >> Issue (10): 1908025.doi: 10.3866/PKU.WHXB201908025

所属专题: 胶体与界面化学前沿

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薄膜基荧光气体传感器中的涂层化学

刘太宏, 苗荣, 彭浩南, 刘静, 丁立平, 房喻()   

  • 收稿日期:2019-08-22 录用日期:2019-10-08 发布日期:2020-06-11
  • 通讯作者: 房喻 E-mail:yfang@snnu.edu.cn
  • 作者简介:房喻,英国Lancaster大学高分子物理化学专业哲学博士,现为陕西师范大学化学化工学院教授。主要致力于薄膜基荧光传感和分子凝胶研究工作
  • 基金资助:
    国家自然科学基金(21527802);国家自然科学基金(21673133);国家自然科学基金(201820102005);高等学校学科创新引智计划(B14041);长江学者与创新团队发展计划(IRT-14R33);陕西省自然科学基础研究计划(2019JM-404);中央高校基本科研业务费专项(GK201803024);陕西高校青年创新团队资助项目

Adlayer Chemistry on Film-based Fluorescent Gas Sensors

Taihong Liu, Rong Miao, Haonan Peng, Jing Liu, Liping Ding, Yu Fang()   

  • Received:2019-08-22 Accepted:2019-10-08 Published:2020-06-11
  • Contact: Yu Fang E-mail:yfang@snnu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21527802);the National Natural Science Foundation of China(21673133);the National Natural Science Foundation of China(201820102005);the 111 Project, China(B14041);the Program for Changjiang Scholars and Innovative Research Team in University, China(IRT-14R33);the Natural Science Basic Research Program of Shaanxi, China(2019JM-404);the Fundamental Research Funds for the Central Universities, China(GK201803024);the Youth Innovation Team of Shaanxi Universities, China

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。最后,文章展望了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, 薄膜基传感器, 荧光, 气体传感, 构效关系, 传感器阵列

Abstract:

Adlayer chemistry has been a significant subject of interest in physical chemistry over the past decades. Considerable attention has been paid to the development of high-performance film-based gas sensors, and tremendous progress has been achieved. Among the different analytical techniques, fluorescence provides a highly sensitive and selective method for detecting a wide variety of analytes. Film-based fluorescent sensors have emerged as one of the most promising candidates for chemical sensing and are being further developed into portable devices. Theoretically, relative signal changes including static and dynamic characteristics are significantly used to determine the sensing process; these characteristics are associated with surface absorption, the interaction between the analytes and sensing adlayer, as well as desorption kinetics in the absence and presence of the targeted gaseous analytes. As revealed earlier, there are a number of factors that determine the sensing behavior of a film, and the most important factors have been identified. Firstly, the suitability of the employed sensing fluorophore, which is important as it ultimately determines the effectiveness of a sensing process. Secondly, the structure of the fluorescent adlayer of the film; this is another important factor as it significantly determines the efficiency of mass transfer, which is necessary for efficient and reversible sensing. Finally, the chemical nature and surface structure of the substrate as these could affect the sensing performance of the film via the screening or enriching of analyte molecules. However, in situ, online, fast, and sensitive detection and discrimination of toxic and hazardous species via vapor sampling is a challenge that will persist for many years. By using the simultaneous interaction of multiple analytes with different sensing materials, the sensor array-based approach can recognize the overall change in the composition of complex mixtures, rather than just identifying their specific elements. The data-rich outputs of array-based sensing methods have recently been widely adopted by the analytical community due to their improved capabilities with statistical and cheminformatic approaches during analysis. Moreover, the community has recognized that numerous complex sensing challenges cannot be solved with conventional analytical tools.

In the past 20 years, our group has been committed to effectively research the formation of fluorescent sensitive films, optimization of sensing films, and fabrication of film-based fluorescent sensor arrays. A series of fluorescence sensitive thin-film materials have been developed, and high-performance fluorescence sensors have been successfully fabricated due to which a positive technological transformation has been achieved. Based on the recent progress in our group, this article briefly reviews the key points of the interactions between the gaseous analytes and adlayer. Moreover, their applications have also been addressed in the vapor phase detection of explosives, illicit drugs, and volatile organic contaminants based on the film-based fluorescent gas sensors. Further discrimination of the complex analytes was realized using a sensor array and pattern recognition strategy. It is strongly believed that our studies are the first to provide powerful fluorescent techniques for the efficient detection and discrimination of important or hazardous substances with remarkably different properties. Meanwhile, the large-scale production of our development demonstrates that interdisciplinary corporation and industry participation plays a vital role in converting laboratory techniques to a conceptual sensing system, which can manufacture commercial portable detectors. Furthermore, we offer insights on the future directions and challenges of film-based sensors in gas sensing.

Key words: Adlayer, Film-based sensor, Fluorescence, Gas sensing, Structure-property relationship, Sensor array

MSC2000: 

  • O647