Journal
BIOSENSORS & BIOELECTRONICS
Volume 20, Issue 1, Pages 41-51Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2004.01.027
Keywords
ethanol; sensor; sputtered Ni/Pt/Ti/Al2O3; amperometry; selectivity; reproducibility
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A novel thin film ethanol sensor using sputtered Ni/Pt/Ti on an Al2O3 substrate as the working electrode in an alkaline solution was developed. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to characterize the nanostructure of nickel films. Sputtering deposition conditions for maximum catalytic efficiency, electrode selectivity, and reproducibility were discussed. The results showed that ethanol oxidation was more efficient on the sputtered Ni/Pt/Ti on an Al2O3 substrate electrode than that on the conventional nickel electrode. The optimal operating conditions to generate the sputtered Ni/Pt/Ti on the Al2O3 substrate electrode were: 45 min of Ni sputtering deposition time, and 50 W of Ni sputtering power. The results also indicated that the response time of the prepared ethanol sensor is 27 s and the best sensitivity is 3.08 muA muM(-1) cm(-2). (C) 2004 Elsevier B.V. All rights reserved.
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