Artificial 'olfactory' images from a chemical sensor using a light-pulse technique
1991 (English)In: Nature, ISSN 0028-0836, Vol. 352, no 6330, 47-50 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Nature Publishing Group , 1991. Vol. 352, no 6330, 47-50 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-88155DOI: 10.1038/352047a0ISI: A1991FV17800064OAI: oai:DiVA.org:liu-88155DiVA: diva2:602814