Humidity Effect on Transport Properties of Titanium Dioxide Nanoparticles
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第8期
论文作者：Muhammad Usman Kamran Rasool S. S. Batool Z. Imran Mushtaq Ahmad Hira Jamil M. A. Rafiq M. M. Hasan
文章页码：748 - 752
摘 要：Rutile TiO2 nanoparticles were synthesized using co-precipitation method with an average diameter of 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 TiO2nanoparticles 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 was17 MΩ/%RH.Complex modulus analysis also confirms the increase in DC conductivity of TiO2 nanoparticles as RH increases.
Muhammad Usman，Kamran Rasool，S. S. Batool，Z. Imran，Mushtaq Ahmad，Hira Jamil，M. A. Rafiq，M. M. Hasan
Micro and Nano Devices Group,Department of Metallurgy and Materials Engineering(DMME),Pakistan Institute of Engineering and Applied Sciences(PIEAS),P. O. Nilore,Islamabad 45650,Pakistan
摘 要：Rutile TiO2 nanoparticles were synthesized using co-precipitation method with an average diameter of 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 TiO2nanoparticles 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 was17 MΩ/%RH.Complex modulus analysis also confirms the increase in DC conductivity of TiO2 nanoparticles as RH increases.
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