Solid State Science and Technology, Vol. 17, No 1 (2009) 126-131

ISSN 0128-7389

 

 COMPARATIVE STUDIES ON MICROSTRUCTURAL AND GAS SENSING PERFORMANCE OF TiO2 AND TiO2-PANi NANOCOMPOSITE THIN FILMS.

Mohammad Hafizuddin Haji Jumali1, Izura Izzuddin1, Norhashimah Ramli1,

Muhamad Mat Salleh2 and Muhammad Yahaya1.

1School of Applied Physics, Faculty of Science and Technology,

2Institute of Microengineering and Nanoelectronic (IMEN),

Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, MALAYSIA

 

ABSTRACT

In recent years, the development of inorganic-organic hybrid materials has grown due to better properties and wide range of potential use. The aim of this research is to investigate the effect of PANi addition on VOC gas sensing properties and microstructures of TiO2 based thin films. TiO2 ceramics were prepared via sol-gel technique. PANi, in amount of 3wt% was added to TiO2 sol to produce TiO2-PANi solution. Then TiO2 and TiO2-PANi solutions were deposited onto SiO2 coated silicon substrate using spin coating technique for fabrication of gas sensing device. XRD investigation showed that the thin films were amorphous. TEM study of the TiO2 and TiO2-PANi powders revealed a significant reduction of TiO2 particles size from 10nm to 2nm with the addition of PANi. SEM micrographs showed that both films exhibit an open porous structure with TiO2 rich grain particles well distributed on the substrate. The gas sensing devices were exposed towards VOCs vapours. It was found that the device with addition 3wt% of PANi exhibit a systematic response towards ethanol and methanol vapour exposure at room temperature. In contrast TiO2 thin film did not show any response due to low operating temperature.

 

http://journal.masshp.net/wp-content/uploads/Journal/2009/Jilid%201/Mohammad%20Hafizuddin%20Haji%20Jumali%20126-131.pdf

 

 

REFERENCES

[1]. Dhawale, D.S., Salunkhe, R.R., Patil, U.m., Gurav, K.V., More, A.M., Lokhande, C.D. 2008. Room temperature liquefied petroleum gas (LPG) sensor based on p-polyaniline/n-TiO2 heterojunction. Journals of Sensors and Actuators.

[2]. Bai, H. & Shi, G. 2007. Review gas sensors based on conducting polymers.

Journal of Sensors. 7: 267-307

[3]. Tai, H., Jiang Y., Xie, G., Yu, J., Chen, X. & Yu, Z. 2007. Influence of polymerization temperature on NH3 response of Pani/TiO2 thin film gas sensor. Journal of Sensors and Actuators B. 129:319-326

[4]. Shi Jian, S. & Kuramoto, N. 2000. Processable polyaniline-titanium dioxide nanocomposites: effect of titanium dioxide on the conductivity. Journal of Synthetic Metals. 114: 147-153

[5]. Geng L., Zhao, Y., Huang, X., Wang, S., Zhang, S. & Wu, S. 2007. Characterization and gas sensitivity study of Polyaniline/SnO2 hybrid material prepared by hydrothermal route. Journal of Sensors and Actuators B. 120: 568-572

[6]. Arshad, S., Mat Salleh, M. & Yahaya, M. 2008. The performance of quartz crystal microbalance gas sensor using titanium dioxide nanoparticles coated with porphyrin thin films. Journal of Sensor Letter. 6: 1-5

[7]. Hieu, N. V., Duy, N. V., Huy, P. T. & Chien, N. D. 2008. Inclusion of SWCNTs in Nb/Pt co-doped TiO2 thin film sensor for ethanol vapour detection. Journal of Physica E. 40: 2950-2958

[8]. Tang, H., Prasad, K., Sanjines R. & Levy, F. 1995. TiO2 anatase thin films as gas sensors. Journal of Sensors and Actuators. 26-27: 71-75

[9]. Xu, J. C., Liu, W. M., & Li, H. L. 2005. Titanium Dioxide Doped Polyaniline. Journals of Materials Science & Engineering. 25 : 444-447

[10]. Zheng, J., Li, G., Ma, X., Wang, Y., Wu, G., & Cheng, Y. 2008. Polyaniline-TiO2 nano-composite-based trimethylamine QCM sensor and its thermal behavior studies. Journal of Sensors and Actuators B.

[11]. Ram, M. K., Yavuz, O., Lahsangah, V. & Aldissi, M. 2005. CO gas sensing ultrathin nanokomposit conducting polimer. Journal of Sensors and Actuators B. 106: 750-757

[12]. Teleki, A., Bjelobrk, N. & Pratsinis, S. E. 2008. Flame-made Nb- and Cu-doped TiO2 sensors for CO and ethanol. Journal of Sensors and Actuators B. 130: 449-457

[13]. Somani, P. R., Marimuthu, P. R., Mulik, U. P., Sankar, S. R. & Amalnerkar, D. P. 1999. High piezoresistivityand its origin in conducting polyaniline/TiO2 composites. Journal of Synthetic Metals. 106: 45-52

Corresponding Author: hafizhj@ukm.my

131