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
Diserahkan: 25 Januari 2010 / Diterima: 25 Mac 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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*Pengarang
surat-menyurat; email: hafizhj@ukm.my
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