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Issue 10, 2005
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First-generation hybrid MEMS gas chromatograph

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Abstract

The fabrication, assembly, and initial testing of a hybrid microfabricated gas chromatograph (µGC) is described. The µGC incorporates capabilities for on-board calibration, sample preconcentration and focused thermal desorption, temperature-programmed separations, and “spectral” detection with an integrated array of microsensors, and is designed for rapid determinations of complex mixtures of environmental contaminants at trace concentrations. Ambient air is used as the carrier gas to avoid the need for on-board gas supplies. The microsystem is plumbed through an etched-Si/glass microfluidic interconnection substrate with fused silica capillaries and employs a miniature commercial pump and valve subsystem for directing sample flow. The latest performance data on each system component are presented followed by first analytical results from the working microsystem. Tradeoffs in system performance as a function of volumetric flow rate are explored. The determination of an 11-vapor mixture of typical indoor air contaminants in less than 90 s is demonstrated with projected detection limits in the low part-per-billion concentration range for a preconcentrated air-sample volume of 0.25 L.

Graphical abstract: First-generation hybrid MEMS gas chromatograph

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Article information


Submitted
16 Jun 2005
Accepted
20 Jul 2005
First published
10 Aug 2005

Lab Chip, 2005,5, 1123-1131
Article type
Paper

First-generation hybrid MEMS gas chromatograph

C. Lu, W. H. Steinecker, W. Tian, M. C. Oborny, J. M. Nichols, M. Agah, J. A. Potkay, H. K. L. Chan, J. Driscoll, R. D. Sacks, K. D. Wise, S. W. Pang and E. T. Zellers, Lab Chip, 2005, 5, 1123 DOI: 10.1039/B508596A

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