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Träfflista för sökning "L773:0028 0836 OR L773:1476 4687 srt2:(1990-1999);srt2:(1991)"

Sökning: L773:0028 0836 OR L773:1476 4687 > (1990-1999) > (1991)

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  • Lundström, Ingemar, et al. (författare)
  • Artificial 'olfactory' images from a chemical sensor using a light-pulse technique
  • 1991
  • Ingår i: Nature. - Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 352:6330, s. 47-50
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>THERE is much interest in the use of chemical sensor arrays, in conjunction with pattern-recognition routines, for developing artificial olfactory devices-electronic noses-which can characterize the chemical composition of gas mixtures 1-5. Here we describe a technique that uses a continuous sensing surface and a detection method involving a scanning pulsed light source, to generate images that represent a fingerprint of the gases detected. The detector is a large-area field-effect device with a number of different catalytic metals constituting the detecting surface (the devices active gate) 6,7. A pulsed light beam scanned across this surface generates a photocapacitive current that varies with the value of the surface potential 8,9. A continuous sensing surface of this type provides information that would require an array of hundreds of discrete sensors. The technique also provides a new means of studying the coupling between the electronic properties of catalytic metals and chemical reactions taking place on their surfaces.</p>
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