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Improvement in metrological performances of phthalocyanine-based QCM sensors for BTX detection in air through substituent’s effect
Sensors and Actuators B: Chemical ( IF 8.4 ) Pub Date : 2022-06-20 , DOI: 10.1016/j.snb.2022.132253
Abhishek Kumar , Christelle Varenne , Amadou L. Ndiaye , Alain Pauly , Marcel Bouvet , Jérôme Brunet

Molecular engineering in macrocyclic materials like metallophthalocyanines (MPc) is a powerful strategy to tune the thin film properties that can be relevant to develop high performance gas sensors. In this context, the present work reports the enhancement in BTX sensing properties of MPc-based quartz crystal microbalance (QCM) sensors through exploiting the large surface area of tertiary-butyl (ttb) substituent grafted at the periphery of CuPc. Thin films of CuPc and ttb-CuPc reveal distinct morphologies and microstructures, in which the former presents a locally organized columnar structure, while the latter has an amorphous structure, containing agglomeration of molecular clusters. Such structural variation of the MPc films has huge implications on benzene, toluene and xylenes (BTX) sensing properties of the QCM sensors, utilizing these materials as sensing layers. Responses of ttb-CuPc-based QCM sensor are amplified by ca. 4-times and response time is reduced, compared to CuPc-based sensor. Moreover, ttb-CuPc-based QCM sensor displays high repeatability, resolution better than 20 ppm, negligible hysteresis and high sensitivity with limit of detection to 2 ppm, 1 ppm and 0.7 ppm for benzene, toluene and xylenes, respectively. Such favorable metrological characteristics combined with negligible interference from other gases make this microsensors suitable for BTX detection in real environment at concentrations below the recommended guidelines.



中文翻译:

通过取代基效应提高基于酞菁的 QCM 传感器用于空气中 BTX 检测的计量性能

金属酞菁 (MPc) 等大环材料中的分子工程是调整与开发高性能气体传感器相关的薄膜特性的有力策略。在这种情况下,本工作报告了通过利用在 CuPc 外围接枝的叔丁基 (ttb) 取代基的大表面积,增强了基于 MPc 的石英晶体微天平 (QCM) 传感器的 BTX 传感特性。CuPc和ttb-CuPc薄膜显示出不同的形貌和微观结构,前者呈现局部组织的柱状结构,而后者具有无定形结构,包含分子簇的团聚。MPc 薄膜的这种结构变化对 QCM 传感器的苯、甲苯和二甲苯 (BTX) 传感特性具有巨大影响,利用这些材料作为传感层。基于 ttb-CuPc 的 QCM 传感器的响应被 ca 放大。与基于 CuPc 的传感器相比,响应时间缩短了 4 倍。此外,基于 ttb-CuPc 的 QCM 传感器具有高重复性、优于 20 ppm 的分辨率、可忽略的滞后和高灵敏度,苯、甲苯和二甲苯的检测限分别为 2 ppm、1 ppm 和 0.7 ppm。这种有利的计量特性与可忽略的其他气体干扰相结合,使该微型传感器适用于在实际环境中检测浓度低于推荐准则的 BTX。分辨率优于 20 ppm,滞后可忽略不计,灵敏度高,苯、甲苯和二甲苯的检测限分别为 2 ppm、1 ppm 和 0.7 ppm。这种有利的计量特性与可忽略的其他气体干扰相结合,使该微型传感器适用于在实际环境中检测浓度低于推荐准则的 BTX。分辨率优于 20 ppm,滞后可忽略不计,灵敏度高,苯、甲苯和二甲苯的检测限分别为 2 ppm、1 ppm 和 0.7 ppm。这种有利的计量特性与可忽略的其他气体干扰相结合,使该微型传感器适用于在实际环境中检测浓度低于推荐准则的 BTX。

更新日期:2022-06-22
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