Real-time monitoring of sub-ppb concentrations of aromatic volatiles with a MEMS-enabled miniaturized gas-chromatograph

Zampolli, S.; Elmi, I.; Mancarella, F.; Betti, Paolo; Dalcanale, Enrico; Cardinali, G.C.; Severi, M.

doi:10.1016/j.snb.2009.06.021

Cited by 204 publications

(144 citation statements)

References 31 publications

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“…5 State-of-the-art laboratory techniques such as conventional gas or liquid chromatography, mass spectrometry, and optical spectroscopic techniques are of limited applicability for in-field deployment or use by first responders. Two notable exceptions are microgas chromatography systems (μ-GC) 6,7 and fiber-based infrared (IR) sensors, 8 which are continuously evolving technologies. While both of these systems have the potential of being integrated into hand-held platforms, their potential cost and complexity may still limit widespread routine use.…”

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confidence: 99%

Liquid-Phase Chemical Sensing Using Lateral Mode Resonant Cantilevers

et al. 2010

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mentioning

confidence: 99%

Liquid-Phase Chemical Sensing Using Lateral Mode Resonant Cantilevers

et al. 2010

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“…This may be smaller than some advanced cryofocus-GC-MS but larger than miniaturized GC with the detector based on metal oxide gas sensors. 25 The availability of recent advanced gas analytical techniques is often limited due to their economical cost. For example, CRDS is rather expensive because it requires the laser system and high reflectivity mirrors.…”

Section: Comparison With Other Gas Analytical Techniquesmentioning

confidence: 99%

Temperature Programmed Desorption of Quench-condensed Krypton and Acetone in Air; Selective Concentration of Ultra-trace Gas Components

Suzuki

Sakaguchi

2016

ANAL. SCI.

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Selective concentration of ultra-trace components in air-like gases has an important application in analyzing volatile organic compounds in the gas. In the present study, we examined quench-condensation of the sample gas on a ZnO substrate below 50 K followed by temperature programmed desorption (TPD) (low temperature TPD) as a selective gas concentration technique. We studied two specific gases in the normal air; krypton as an inert gas and acetone as a reactive gas. We evaluated the relationship between the operating condition of low temperature TPD and the lowest detection limit. In the case of krypton, we observed the selective concentration by exposing at 6 K followed by thermal desorption at about 60 K. On the other hand, no selectivity appeared for acetone although trace acetone was successfully concentrated. This is likely due to the solvent effect by a major component in the air, which is suggested to be water. We suggest that pre-condensation to remove the water component may improve the selectivity in the trace acetone analysis by low temperature TPD.

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“…The limitations of this method include the temperature's non-uniformity and the process of heating the column is slow. Significant progress has been made by different research groups [4][5][6][7][8] to miniaturize the GC system to a portable low power, low cost GC system capable of separating and detecting all the volatile organic compounds (VOCs) in a short time; however, band broadening and slow temperature programming are shortcomings of these instruments.…”

Section: Introductionmentioning

confidence: 99%

All Silicon Micro-GC Column Temperature Programming Using Axial Heating

et al. 2015

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Abstract:In this work we present a high performance micro gas chromatograph column with a novel two dimensional axial heating technique for faster and more precise temperature programming, resulting in an improved separation performance. Three different axial resistive heater designs were simulated theoretically on a 3.0 m × 300 μm × 50 μm column for the highest temperature gradient on a 22 by 22 μm column. The best design was then micro-fabricated and evaluated experimentally. The simulation results showed that simultaneous temperature gradients in time and distance along the column are possible by geometric optimization of the heater when using forced convection. The gradients along the column continuously refocused eluting bands, offsetting part of the chromatographic band spreading. The utility of this method was further investigated for a test mixture of three hydrocarbons (hexane, octane, and decane).

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Real-time monitoring of sub-ppb concentrations of aromatic volatiles with a MEMS-enabled miniaturized gas-chromatograph

Cited by 204 publications

References 31 publications

Liquid-Phase Chemical Sensing Using Lateral Mode Resonant Cantilevers

Liquid-Phase Chemical Sensing Using Lateral Mode Resonant Cantilevers

Temperature Programmed Desorption of Quench-condensed Krypton and Acetone in Air; Selective Concentration of Ultra-trace Gas Components

All Silicon Micro-GC Column Temperature Programming Using Axial Heating

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