Systematic studies on responses of metal-oxide sensor surfaces to straightchain alkanes, alcohols, aldehydes, ketones, acids and esters using the SOMMSA approach

Citation
D. Kohl et al., Systematic studies on responses of metal-oxide sensor surfaces to straightchain alkanes, alcohols, aldehydes, ketones, acids and esters using the SOMMSA approach, SENS ACTU-B, 70(1-3), 2000, pp. 43-50
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
SENSORS AND ACTUATORS B-CHEMICAL
ISSN journal
0925-4005 → ACNP
Volume
70
Issue
1-3
Year of publication
2000
Pages
43 - 50
Database
ISI
SICI code
0925-4005(20001101)70:1-3<43:SSOROM>2.0.ZU;2-6
Abstract
Metal oxide sensors are widely used in the so-called "electronic noses", an d it is proposed that these equipment can be used to objectify food aromas. Due to the fact that, up to now, systematic approaches to correlate the int ensity of sensor responses with the structure of a given volatile have scar cely been performed [K. Suzuki, T. Takada, Highly sensitive odour sensors u sing various SnO2 thick films, Sans. Actuators, B 24-25 (1995) 773-776; B. Lalauze et ai., High sensitivity materials for gas detection, Sens. Actuato rs, B 8 (1992) 237-243; K. Fukui, Detection and measurement of odor by sint ered tin oxide gas sensor, Sens. Actuators; B 5 (1991) 27-32; J.W. Gardner, A. Pike et al., Integrated array sensor for detecting organic solvents, Se ns. Actuators, B 13-14 (1993) 355-357.], it is as yet not possible to predi ct the sensitivity and the specivity of metal oxide preparations vs. a give n chemical structure. Using the SOMMSA approach [T. Hofmann et al., High resolution gas chromatog raphy/selective odorant measurement by multisensor array (HRGC/SOMSA): a us eful approach to standardize multisensor arrays for the use in the detectio n of key food odorants, Sens. Actuators, B 41 (1997) 81-87.], mixtures of a lkanes, alcohols, aldehydes tall with chain length of 8-14 carbon atoms) an d acids (chain length of 2-10 carbon atoms) were applied to different self- prepared metal oxide mixtures and the signal intensities were monitored. In addition, quantitative experiments were performed to determine the detecti on threshold of sensors. E.g. (E,E)-2,4-non-adienal, one of the most import ant odorants in fresh cucumbers, could be clearly detected at a level below 4.0 ng/ml (He) by a sensor containing a mixture of ZnO and SnO2. (C) 2000 Elsevier Science B.V. All rights reserved.