Nano Archive

Gas sensing properties of ZnO thin films prepared by microcontact printing

Lim, Hey-Jin and Lee, Deuk Yong and Oh, Young-Jei (2006) Gas sensing properties of ZnO thin films prepared by microcontact printing. Sensors and Actuators A: Physical, 125 (2). 405 - 410.

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In situ patterned zinc oxide (ZnO) thin films were prepared by precipitation of Zn(NO3)2/urea aqueous solution and by microcontact printing of self-assembled monolayers (SAMs) on Al/SiO2/Si substrates. The visible precipitation of Zn(OH)2 from the urea containing Zn(NO3)2 solution was enhanced by increasing the reaction temperature and the amount of urea. The optimized condition for the ZnO thin films was found to be the Zn(NO3)2/urea ratio of 1/8, the precipitation temperature of 80 °C, the precipitation time of 1 h and the annealing temperature of 600 °C, respectively. SAMs are formed by exposing Al/SiO2/Si to solutions comprising of hydrophobic octadecylphosphonic acid (OPA) in tetrahydrofuran and hydrophilic 2-carboxylethylphosphonic acid (CPA) in ethanol. The ZnO thin film was then patterned with the heat treatment of Zn(OH)2 precipitated on the surface of hydrophilic CPA. The ZnO gas sensor was exposed to different concentrations of C3H8 (5000 ppm), CO (250 ppm) and NO (1000 ppm) at elevated temperatures to evaluate the gas sensitivity of ZnO sensors. The optimum operating temperatures of C3H8, CO and NO gases showing the highest gas sensitivity were determined to be 350, 400 and 200 °C, respectively.

Item Type:Article
Uncontrolled Keywords:ZnO gas sensor; Self-assembled monolayers; Microcontact printing; C3H8; CO; NO; Sensitivity
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Engineering > Nanotechnology applications in ICT
ID Code:4665
Deposited By:SPI
Deposited On:08 Apr 2009 17:16
Last Modified:08 Apr 2009 17:16

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