Microfabricated gas chromatograph for Sub-ppb determinations of TCE in vapor intrusion investigations

Chang, Hsin-Yi; Kim, Sun Kyu; Sukaew, Thitiporn; Bohrer, Forest I.; Zellers, Edward T.

doi:10.1016/j.proeng.2010.09.271

Cited by 14 publications

(9 citation statements)

References 8 publications

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“…Early applications of such chip-based GC systems were only reported in analyses of hydrocarbons 3 and gas samples. 80 However, as shown in Table 2, the development of these systems has been extended across a wide variety of application areas such as health service, 45,51,57,81,111,134,139,140 industry pollution monitoring, 56,57,111 environmental analysis, 32,54,56,57,82,88,111,134,141 homeland security, 50,142,143 petrochemical industries, 143 and as the second dimension of comprehensive two-dimensional gas chromatography (GC × GC). 80,97,98,111,137 Nowadays chipbased gas chromatograph instruments are commercially available from companies such as Dolomite, 144 C2V 145 , etc.…”

Section: Applicationsmentioning

confidence: 99%

Through the years with on-a-chip gas chromatography: a review

2015

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In recent years, the need for measurement and detection of samples in situ or with very small volume and low concentration (low and sub-parts per billion) is a cause for miniaturizing systems via microelectromechanical system (MEMS) technology. Gas chromatography (GC) is a common technique that is widely used for separating and measuring semi-volatile and volatile compounds. Conventional GCs are bulky and cannot be used for in situ analysis, hence in the past decades many studies have been reported with the aim of designing and developing chip-based GC. The focus of this review is to follow and investigate the development and the achievements in the field of chip-based GC and its components from the beginning up to the present.

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Section: Applicationsmentioning

confidence: 99%

Through the years with on-a-chip gas chromatography: a review

2015

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“…14 This should lead to commensurate reductions in detector dead times and associated band broadening, which are currently limiting factors in microsensor-based μGC detectors. 14, 35 On-going work is directed at integrating multi-MPN arrays with EBIX-patterned films into complete μGC prototypes such as those we have reported on recently. 35 ' ASSOCIATED CONTENT b S Supporting Information.…”

Section: ' Conclusionmentioning

confidence: 99%

“…14, 35 On-going work is directed at integrating multi-MPN arrays with EBIX-patterned films into complete μGC prototypes such as those we have reported on recently. 35 ' ASSOCIATED CONTENT b S Supporting Information. Recognition matrices for individual-vapor discriminations as well as the RR values for all binary mixtures using the unpatterned and patterned CR arrays.…”

Section: ' Conclusionmentioning

confidence: 99%

Characterization of Dense Arrays of Chemiresistor Vapor Sensors with Submicrometer Features and Patterned Nanoparticle Interface Layers

et al. 2011

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The performance of arrays of small, densely integrated chemiresistor (CR) vapor sensors with electron-beam patterned interface layers of thiolate-monolayer-protected gold nanoparticles (MPNs) is explored. Each CR in the array consists of a 100-μm(2) interdigital electrode separated from adjacent devices by 4 μm. Initial studies involved four separate arrays, each containing four CRs coated with one of four different MPNs, which were calibrated with five vapors before and after MPN-film patterning. MPNs derived from n-octanethiol (C8), 4-(phenylethynyl)-benzenethiol (DPA), 6-phenoxyhexane-1-thiol (OPH), and methyl-6-mercaptohexanoate (HME) were tested. Parallel calibrations of MPN-coated thickness-shear-mode resonators (TSMR) were used to derive partition coefficients of unpatterned films and to assess transducer-dependent factors affecting responses. A 600-μm(2) 4-CR array with four different patterned MPN interface layers, in which the MPN derived from 7-hydroxy-7,7-bis(trifluoro-methyl)heptane-1-thiol (HFA) was substituted for HME, was then characterized. This is the smallest multi-MPN array yet reported. Reductions in the diversity of the collective response patterns are observed with the patterned films, but projected vapor discrimination rates remain high. The use of such arrays as ultralow-dead-volume detectors in microscale gas chromatographic analyzers is discussed.

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“…The commonly used chemical detection methods are gas chromatography (GC), detection tubes, and gas sensitivity sensors, as listed in Table 1. [14][15][16][17][18][19][20] GC with high sensitivity is costly, time-consuming, and suitable for laboratory-based analysis rather than continuous on-line monitoring or portable detection. A detection tube can be used to detect major decomposition products, such as SO 2 or HF, at parts per million (ppm) levels.…”

Section: Introductionmentioning

confidence: 99%

Optical technology for detecting the decomposition products of SF6: a review

Zhang

Tang

et al. 2018

Opt. Eng.

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Studies have demonstrated that partial discharge in SF 6-insulated electrical equipment can cause SF 6 decomposition, resulting in the generation of various products. Quantitative detection of these decomposition products can be used to evaluate the state of the equipment's insulation. The use of optical methods for detecting the products has many advantages, such as high precision, fast response, and sample reusability. Thus far, optical detection methods have been applied for detection of SF 6 decomposition products, and a few promising results have been obtained. We review the various optical technologies for detection of SF 6 decomposition products, introduce their principles and applications, and summarize some recent research progress. In addition, we propose two optical detection technologies that can be applied in this field.

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Microfabricated gas chromatograph for Sub-ppb determinations of TCE in vapor intrusion investigations

Cited by 14 publications

References 8 publications

Through the years with on-a-chip gas chromatography: a review

Through the years with on-a-chip gas chromatography: a review

Characterization of Dense Arrays of Chemiresistor Vapor Sensors with Submicrometer Features and Patterned Nanoparticle Interface Layers

Optical technology for detecting the decomposition products of SF6: a review

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