Bahru, Raihana
(2013)
Preparation, Characterization And Performance Of
Polyaniline-Titanium Oxide Composite Pellet For
Detection Of Acetone Vapor.
Masters thesis, Universiti Sains Malaysia.
Abstract
The present work focuses on the detection of the VOCs with particular
emphasis on acetone which is harmful to the environment and human health. The
semiconductor based sensor is one of the best VOC sensors which currently
available. However, the main drawback of this type of gas sensor is the utilization of
high optimum operating temperature (greater than 200oC). An interesting approach
for lowering the operating temperature is by incorporating an organic material as the
additional sensing material. A conducting polymer known as polyaniline (PANI) was
added to titanium oxide (TiO2) by in-situ chemical polymerization method to form
PANI-TiO2 composite pellet to be used for detection of acetone vapor. The
composite sensor was characterized using X-ray Diffraction (XRD), Scanning
Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) Spectroscopy,
Transmission Electron Microscopy (TEM), Fourier Transformation Infrared
Spectroscopy (FTIR), and Surface Analysis (N2 adsorption-desorption). The
performances of composite pellets were tested using sensing measurement unit at
temperature 27oC - 65oC by releasing the acetone vapor at various concentrations in
the range of 100 – 500 ppm. Response Surface Methodology (RSM) was used to
optimize the experimental data. A correlation of 3 parameters which are additive
loadings, operating temperature and acetone vapor concentration has been
considered. It was found that 30wt.% PANI-TiO2 was the best composite pellet
which gave the maximum sensitivity. The optimum performance was at 45oC with
sensitivity approximately at ~16.19% towards 300 ppm acetone vapor concentration.
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