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Lab Chip

Title:		Fabry-Perot cavity sensor-based optofluidic gas chromatography using a microfabricated passive preconcentrator/injector
Author(s):		Seo JH; Liu J; Fan X; Kurabayashi K;
Address:		"Engineering Research Center for Wireless Integrated Microsensing and Systems (WIMS2), University of Michigan, Ann Arbor, MI 48109, USA"
Journal Title:		Lab Chip
Year:		2013
Volume:		20130107
Issue:		5
Page Number:		851 - 859
DOI:		10.1039/c2lc41119a
ISSN/ISBN:		1473-0189 (Electronic) 1473-0189 (Linking)
Abstract:		"This study reports on dual on-column Fabry-Perot (FP) cavity sensor-based gas chromatography (GC) of mixtures of volatile organic compounds (VOCs) utilizing an on-chip device, the so called 'microfabricated passive preconcentrator/injector (muPPI)'. Comprehensive analysis of the sampling, desorption/injection, and compound separation performance of the muPPI-based optofluidic GC system is described. Here, the combined use of the muPPI and on-column FP cavity sensors in a common GC platform enabled diffusion-based passive sampling, rapid (<7 min) chromatographic separation, and optical detection for the quaternary VOC mixtures of benzene, TCE, toluene, and m-xylene at sub-ppm concentrations with a simpler fluidic setup than conventional GC systems. The FP cavity sensor arrangement provided the means to study the dynamics of the thermal desorption/injection of VOCs by the muPPI and its effect on the GC separation resolution. Our analysis of obtained chromatograms revealed a presence of the competitive adsorptions of VOC mixtures onto the adsorption sites of trapping materials in the muPPI, which decreased the effective sampling rate by ~50% for compounds with high volatility. The validated performance of the optofluidic GC system promises future development of a field deployable GC microsystem incorporating the muPPI and the FP cavity sensors"
Keywords:		"Calibration Chromatography, Gas/instrumentation/*methods/standards Gases/chemistry Microfluidic Analytical Techniques/instrumentation/*methods/standards Optical Phenomena Temperature Volatile Organic Compounds/*analysis/isolation & purification/standards;"
Notes:		"MedlineSeo, Jung Hwan Liu, Jing Fan, Xudong Kurabayashi, Katsuo eng Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. England 2013/01/09 Lab Chip. 2013 Mar 7; 13(5):851-9. doi: 10.1039/c2lc41119a. Epub 2013 Jan 7"