Ion mobility spectrometry (IMS) is an attractive material analysis technology for developing a miniaturized volatile
organic compounds (VOCs) on-site monitoring sensor. Having simple instrumentation, IMS is especially suitable when
portability and sensitivity are required. In this work, we designed an ion mobility spectrometer with UV ionization. The
geometric parameters of the UV-IMS were optimized based on a numerical simulation. The simulation results
demonstrated that the drift electric field in the drift region was approximately homogenous and in the reaction region had
an ion focusing effect, which could improve the sensitivity and resolving power of the IMS. The UV-IMS has been
constructed and used to detect VOCs, such as acetone, benzene, toluene and m-xylene (BTX). The resolution of these
substance measured from the UV-IMS in the atmospheric conditions are about 30 and the limit of detection (LOD) is low to
ppmv. The ion mobility module and electric circuit are integrated in a main PCB, which can facilitate mass production and
miniaturization. The present UV-IMS is expected to become a tool of choice for the on-site monitoring for VOCs.
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