Sains Malaysiana 37(3):  271-275(2008)

 

Performance of Quartz Crystal Microbalance Gas Sensors Using

Thin Films of Titanium Dioxide, Porphyrin and Titanium

Dioxide Coated with Dye Porphyrin

(Prestasi Penderia Gas Mikroneraca Hablur Kuartza Menggunakan

Film Nipis Titanium Dioksida dengan Porfirin dan Titanium Dioksida

disalut dengan Pencelup Porfirin)

 

Syariena Arshad & M.M. Salleh

Institute of Microengineering and Nanoelectronics (IMEN)

Universiti Kebangsaan Malaysia, 43600 Bangi,

Selangor, Malaysia

 

M. Yahaya

School of Applied Physics

Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi,

Selangor, Malaysia

 

Received: 12 June 2007 / Accepted: 15 October 2007

 

ABSTRACT

 

Titanium dioxide (TiO2), porphyrin and TiO2 coated with dye porphyrin thin films were prepared on Quartz Crystal Microbalance (QCM) using sol-gel dip coating method and were tested for sensing of volatile organic compounds (VOCs). The porphyrin used was 5,10,15,20-tetraphenyl-21H,23H-porphine manganese (III) chloride (MnTPPCl). The sensing sensitivity was based on the change in the fundamental frequency of the QCM upon exposure towards six vapor samples, namely ethanol, acetone, cyclohexane, toluene, o-xylene and 2-propanol. It was found that all the thin films were sensitive towards all the vapors. However, the TiO2 coated MnTPPCl thin film exhibit the most sensitive and has good selectivity property.

 

Keywords: Titanium dioxide (TiO2); dye porphyrins; Quartz Crystal Microbalance; sol-gel dip coating method; volatile organic compounds (VOCs)

 

 

ABSTRAK

 

Filem nipis titanium dioksida (TiO2), porfirin dan TiO2 bersalut porfirin disediakan di atas mikroneraca hablur kuartza (QCM) menggunakan teknik swa-lekatan sol-gel dan diuji untuk pengesanan gas sebatian meruap. Porfirin yang digunakan adalah 5,10,15,20-tetrafenil-21H,23H-porfin mangan (III) klorida (MnTPPCl). Kepekaan pengesanan adalah berdasarkan perubahan pada frekuensi asal QCM apabila didedahkan kepada enam sampel sebatian organik meruap iaitu etanol, aseton, sikloheksana, toluena dan o-xilena. Didapati semua filem nipis peka terhadap semua gas. Filem nipis TiO2 bersalut porfirin menunjukkan kepekaan tertinggi dan mempunyai sifat kebolehpilihan yang baik.

 

Kata kunci: Titanium dioksida (TiO2); pencelup porfirin; mikroneraca hablur kuartza (QCM); kaedah salutan dalam sol-gel; sebatian organik meruap

 

 

REFERENCES/RUJUKAN

 

Bonini,    N.,     Carotta,    M.C.,     Chiorino,    A., Guidi,   V.,   Malagł,   C., Martinelli, G., Paglialonga,   L.  and Sacerdoti, M.  2000.  Doping   of a nanostructured titania thick film: Structural and electrical investigations. Sensors and Actuators B, 68: 274-280.

Carotta, M.C., Ferroni, M., Gnani, D., Guidi, V., Merli, M., Martinelli, G., Casale, M.C., Notaro,   M.   2000.   Nb-doped    TiO2    as    thick    film gas sensors   for   environmental monitoring. Sensor Actuators B 58: 310-317.

Faia, P.M., Furtado, C.S. and Ferreira, A.J. 2004. Humidity sensing properties of a thick-film titania prepared   by as low spinning process.  Sensor and Actuators B: 101: 183-190.

Gao, L., Li, Q., Song, Z., Wang, J.  2000. Preparation of nano-scale titania thick film and its oxygen sensitivity. Sensors and Actuators B 71: 179-183.

Karunagaran,  B.,  Uthirakumar, P., Chung, S.J., Velumani, S., Suh, E.K. 2007. TiO2 thin film gas sensor for monitoring ammonia. Materials Characterization 58: 680-684.

Kikuchi, M. Shiratori, S.  Quartz   crystal microbalance (QCM) sensor for CH3SH gas by using polyelectrolyte-coated sol–gel film. 2005 Sensors and Actuators B, 108: 564–571.

Teleki, A., Pratsinis, S.E., Kalyanasundaram, K., Gouma, P.I.   2006.   Sensing of organic vapors by flame-made TiO2 nanoparticles. Sensors and Actuators B 119: 683-690.

 

 

 

previous