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Application of carbon nano-powders for a gas micro-preconcentrator

Abstract : This paper presents a feasibility study on the development of a gas preconcentrator based on micro-reactor technology on silicon. The objectives are to select a gas adsorbent material, to produce a silicon micro-reactor with an integrated heater, and finally to introduce the most suitableadsorbent into the micro-channels of the device. Preliminary results related to the characterization of a carbon adsorbent for the development of adevice for the preconcentration of benzene are reported. Carbon nano-powders have been tested as adsorbent material by the determination of the breakthrough time on a dedicated test bench consisting of gas sensors and a non-selective photoionization detector (micro-PID) analyzer. A fluidic deposition process allows filling up the silicon micro-channels with the carbon nano-powder. The interest in using porous silicon to enhance the binding of the carbon nano-particles in the micro-channels was also investigated. A silicon micromachined preconcentrator filled with 0.30 mg of commercial activated charcoal powder (Aldrich, 30-100 nm) was designed and built up. The total capacity of adsorption was determined by using the breakthrough time, which is of 2.2 min under a gas flow of 100 ppm of benzene at 1 l/h. Preliminary tests of preconcentration with 100 and 1.3 ppm benzene in dry air were performed.
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Submitted on : Thursday, November 12, 2009 - 2:42:08 PM
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Christophe Pijolat, El Hadji Malik Camara, J. Courbat, Jean-Paul Viricelle, Danick Briand, et al.. Application of carbon nano-powders for a gas micro-preconcentrator. Sensors and Actuators B: Chemical, Elsevier, 2007, 127 (1), pp.179-185. ⟨10.1016/j.snb.2007.07.029⟩. ⟨emse-00431516⟩



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