Leidinger, M.M.LeidingerRieger, M.M.RiegerWeishaupt, D.D.WeishauptSauerwald, T.T.SauerwaldNägele, MarcoMarcoNägeleHürttlen, JürgenJürgenHürttlenSchütze, A.A.Schütze2022-03-052022-03-052015https://publica.fraunhofer.de/handle/publica/24719210.1016/j.proeng.2015.08.719A method for the measurement of low gas concentrations is presented. The method was developed for detection of Volatile Organic Compounds (VOCs) in indoor air quality applications and tested with benzene, a carcinogenic VOC with no safe exposure limit value. Using metal organic framework materials, gas pre-concentration devices for benzene were prepared on ceramic micro hotplates and characterized. Two MOF materials (HKUST-1 and MIL-53) were tested. Both showed good preconcentrator performance concerning adsorption and desorption of the target gas. A significant temporary decrease of the benzene concentration in the sampling phase and a corresponding increase in the desorption phase were detected using a mass spectrometer. The MOF pre-concentrators were also tested in combination with a semiconductor gas sensor resulting in a significant increase in the sensor response in the desorption phase.enjournal article