Sains Malaysiana 41(8)(2012): 1017–1021

New Hybridization Approach of Titanium Organometallic:

PANiThin Films as Room Temperature Gas Sensors

(Pendekatan Baru Penghibridan Filem Nipis Organologam Titanium:PANi Sebagai

Pengesan Gas Suhu Bilik)

Izura Izzuddin, Mohammad Hafizuddin Haji Jumali* & Muhammad Yahaya

School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,

43000 Bangi, Selangor D.E., Malaysia

Muhamad Mat Salleh

Institute of Microengineering and Nanotechnology, Universiti Kebangsaan Malaysia,

43000 Bangi, Selangor D.E., Malaysia

Received: 25 January 2010 / Accepted: 25 March 2011

ABSTRACT

The aim of this research was to investigate the ability of organometallic titanium-PANi hybrid materials as gas sensor at room temperature. To form the hybrid materials, commercially available polyaniline (PANi) powder were directly added into organometallic titanium sols which was synthesized using the sol gel method. The composite films were prepared via spin coating technique followed by electrode deposition for sensors fabrication. Five different organometallic titanium:PANi ratios namely 1 wt% to 5 wt% of PANi were prepared for this experiment. For gas sensing test, all samples were exposed to ethanol vapour. The sensing mode is based on the variation in the electrical conductivity due to the interaction between the gas molecules and the film. It was observed that the composite sensors required appropriate ratio to exhibit optimum sensing properties. This finding proved that the hybridization process is successful and offered much cheaper and easier method for fabrication of room temperature gas sensor.

Keywords: Ethanol; nanocomposite; PANi; thin film; TiO₂

ABSTRAK

Kajian ini dijalankan untuk mengkaji keupayaan bahan hibrid organologam titanium-PANi sebagai pengesan gas pada suhu bilik. Untuk penghasilan bahan hibrid, serbuk polianilina (PANi) komersial dicampurkan secara terus ke dalam sol organologam titanium yang disintesis menggunakan teknik sol-gel. Filem komposit telah disediakan menggunakan kaedah salutan berputar diikuti dengan pemendapan elektrod untuk fabrikasi sensor. Lima nisbah organologam titanium: PANi yang berbeza iaitu 1 wt% sehingga 5 wt% kandungan PANi telah disediakan untuk kajian ini. Bagi tujuan pengujian gas, kesemua sampel telah didedahkan kepada wap etanol. Mod pengesanan yang digunakan adalah berdasarkan variasi kekoduksian elektrik akibat interaksi antara molekul gas dan filem. Didapati, pengesan komposit memerlukan nisbah-nisbah tertentu untuk menunjukkan sifat pengesanan yang optimum. Hasil kajian membuktikan proses hibrid yang dilakukan dalam kajian ini berjaya menghasilkan pengesan gas pada suhu bilik dengan kos yang lebih murah dan kaedah penyediaan yang mudah.

Kata kunci: Etanol; filem nipis; nanokomposit; PANi; TiO₂

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*Corresponding author; email: hafizhj@ukm.my