Title: Mesoporous silica films for sensing volatile organic compounds using attenuated total reflection spectroscopy
Language: English
Authors: Baumgartner, Bettina  
Hayden, Jakob 
Lendl, Bernhard  
Keywords: Mid-IR spectroscopy; Mesoporous materials; Sensing; Volatile organic compounds; Functional coating
Issue Date: 2020
Journal: Sensors and Actuators B: Chemical
Sensitivity of evanescent wave sensing of gaseous species can be vastly increased by enrichment materials that locally concentrate the analyte on the sensor. Here, we investigate functionalized mesoporous silica films as versatile enrichment layer for sensing volatile organic compounds (VOCs) from gas-phase. Attenuated total reflection (ATR) crystals were coated with silica films of different pore sizes and their capability to enrich three different aromatic hydrocarbons from a vapor stream was studied by means of Fourier Transform infrared (FTIR) spectroscopy. Thereby, single-digit ppmv limits of detection (LOD) were achieved with an effective path length of only 6.3 μm. The selectivity introduced by the functionalization of the silica films effectively minimized interferences of water vapor, which gave access to the spectral fingerprint region between 1550 and 1450 cm−1. This allowed to discriminate and quantify toluene, p-xylene and 1,2,4-trimethylbenzene in multicomponent mixtures at high humidity. Fast response and regeneration times and enrichment factors up to 32 000 showcase the high potential of this material for evanescent wave sensing.
DOI: 10.1016/j.snb.2019.127194
Library ID: AC15543799
URN: urn:nbn:at:at-ubtuw:3-8137
ISSN: 0925-4005
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
Appears in Collections:Artikel | Article

Files in this item:

File Description SizeFormat Existing users please Login
Mesoporous silica films for sensing volatile organic compounds using attenuated total reflection spectroscopy.pdf1.45 MBAdobe PDFEmbargoed until January 31, 2022    Request a copy
Show full item record

Page view(s)

checked on Jul 2, 2020

Google ScholarTM


This item is licensed under a Creative Commons License Creative Commons