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標題: Composite of TiO2 nanowires and Nafion as humidity sensor material
作者: Wu, R.J.
Sun, Y.L.
Lin, C.C.
Chen, H.W.
Chavali, M.
關鍵字: nanowires;Nafion humidity;impedance;thin-films;sensing properties
Project: Sensors and Actuators B-Chemical
期刊/報告no:: Sensors and Actuators B-Chemical, Volume 115, Issue 1, Page(s) 198-204.
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.
ISSN: 0925-4005
DOI: 10.1016/j.snb.2005.09.001
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