Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 30, Issue 8, Pages 748-752Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2013.12.002
Keywords
TiO2 nanoparticles; Co-precipitation; Transport properties
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Rutile TiO2 nanoparticles were synthesized using co-precipitation method with an average diameter of similar to 30 nm TiO2 nanoparticle device was then fabricated on glass substrate. Aluminum electrodes were defined using photolithography and vacuum evaporation. A suspension of TiO2 nanoparticles was prepared in isopropanol using ultrasonic agitation. The nanoparticles were deposited between the electrodes. The device was tested by AC electrical measurements at 40%-90% relative humidity (RH). The impedance of the TiO2 nanoparticles decreases by about 80 times with the increase in RH from 40% to 90% at 100 Hz. The response time and the recovery time were 4 s and 5 s, respectively between 40% and 90% RH. At 100 Hz, the sensitivity of the aluminum electrode TiO2 nanoparticle device in the range of 40%-90% RH was 17 M Omega/% RH. Complex modulus analysis also confirms the increase in DC conductivity of TiO2 nanoparticles as RH increases.
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