Trace gas VOC Detection Using Metal-organic Frameworks as Pre-concentrators and Semiconductor Gas Sensors. (2015)

• Record Type: Journal Article
• Authors: Leidinger, M.; Rieger, M.; Weishaupt, D.; Sauerwald, T.; Nägele, M.; Hürttlen, J.; Schütze, A.
• Is Part Of: Procedia engineering. Volume 120(2015)
• Page Start: 1042
• Page End: 1045
• Publication Date: 2015
• Subjects: VOC detection -- benzene -- low concentration -- pre-concentrator -- indoor air quality; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.08.719
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: A 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 pre-concentrator 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.