期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 115, 期 1, 页码 198-204出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2005.09.001
关键词
nanowires; Nafion humidity; impedance
Homogeneous TiO2 nanowires were fabricated by hydrothermal method. SEM pictures proved the yield of nanowires to be more than 90%. Composite humidity sensing films were made by using TiO2 nanowires, TEOS and Nafion. FTIR absorption spectroscopy was used as a semiquantitative method to get information about the protonation. The sensing films were prepared by a dip-coating method. The composite films coated on a pair of gold electrodes were tested for humidity sensors of resistance type. The measurement was carried out at five fixed humidity points in the range of 12-97% relative humidity, which were controlled by employing five different salt solutions. Resistance changes were about three orders of magnitude. The nanowires-based humidity sensors showed moderate sensitivity, short response and recovery time (< 2 min) at relative humidity less than 76%, and good long-term stability. (c) 2005 Elsevier B.V. All rights reserved.
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