Volatile organic compounds (VOCs) are being considered for a wide range of applications, since they provide information on specific processes (e.g., metabolic processes in humans and plants). To date, environmental VOCs detection can be accomplished with low selectivity using both portable photoionization techniques or using gold standard laboratory techniques (e.g., gas and liquid chromatography, mass spectrometry), getting higher performances and limitations in terms of portability, availability of equipment and of consumption of time. Hereafter, a modified photoionization technique based on a thin zeolite layer for the selective adsorption of VOCs was investigated, exploiting the processes of thermal adsorption and desorption. Zeolite through the inherent nanoporous structure possesses specific electrical characteristics, strongly influenced by the adsorption of the molecules within the framework. Experimental analysis of its electrical and adsorption/desorption properties of propionic and succinic acids was performed. Results demonstrated how the use of a thin nanoporous layer allows to increase the selectivity of commercial photoionization detector during VOC detection, evidencing the potentiality of this technique for the development of low-cost and high-performance sensors in various applications.

挥发性有机化合物（VOC）被认为具有广泛的应用，因为它们提供了特定过程的信息（例如，人类和植物的代谢过程）。迄今为止，使用便携式光电离技术或使用金标准实验室技术（例如气相色谱和液相色谱、质谱）可以以低选择性完成环境挥发性有机化合物的检测，在便携性、设备可用性和技术方面获得更高的性能和局限性。时间的消耗。此后，研究了一种基于薄沸石层的改进光电离技术，利用热吸附和解吸过程选择性吸附 VOC。沸石通过固有的纳米孔结构具有特定的电特性，受到框架内分子吸附的强烈影响。对丙酸和琥珀酸的电学和吸附/解吸性能进行了实验分析。结果证明了薄纳米多孔层的使用如何提高商用光电离检测器在 VOC 检测过程中的选择性，证明了该技术在各种应用中开发低成本和高性能传感器的潜力。