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Title:Sol-gel-based optical sensor for the detection of aqueous amines
Authors:Korent Urek, Špela (Author)
Lobnik, Aleksandra (Author)
Mohr, Gerhard J. (Author)
Files:URL http://dx.doi.org/10.1007/s00216-007-1146-x
 
Language:English
Work type:Unknown ()
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:We present an optical sensor for the detection of aqueous amines obtained by incorporating chromoionophore XV (ETHT 4001) into sol-gel thin films. Acid- and base-catalyzed sol-gel processes were studied to prepare stable ormosil layers using various amounts of organically modified sol-gel precursor such asmethyltriethoxysilane (MTriEOS). The sensor layers were coated with a protective layer of microporous white polytetrafluoroethylene (PTFE) in order to prevent interference from ions and ambient light. The measurements were carried out in a flow-through cell in the reflection mode. Acid-catalyzed ormosil layers (pH 1) based on the copolymerization of tetraethoxysilane (TEOS) and MTriEOS did not show any change in signal upon exposure to aqueous amine solutions, while base-catalyzed sensor layers (pH 3 and 13) showed significant changes in signal. The response time (t100) for the base-catalyzedsensor layer L3 (pH 13) upon exposure to different solutions containing 0-608 mmol L-1 aqueous propylamine was 20-30 s, the regeneration time was 70 s and the detection limit was 0.1 mmol L-1. The sensor response was reproducible and reversible. The porous ormosil layers permit dry sensor storage conditions.
Keywords:analytical chemistry, optical sensors, sol-gel technology, determination of amines, fluorimetry
Year of publishing:2007
UDC:543.4
ISSN on article:1618-2642
COBISS_ID:11135254 Link is opened in a new window
Views:1291
Downloads:13
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Categories:Misc.
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Record is a part of a journal

Title:Analytical and bioanalytical chemistry
Shortened title:Anal. bioanal. chem.
Publisher:Springer
ISSN:1618-2642
COBISS.SI-ID:6966294 New window

Secondary language

Language:English
Keywords:analizna kemija, optični senzorji, sol-gel tehnologija, določevanje aminov, fluorometrija


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