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| dc.description.abstract | Chemical sensor is an effective way to detect
pollutant, toxic and combustible gases. Therefore, a lot of
effort has been focused on this field. The conventional metal
oxide gas sensors are activated by heat, generally working at a
temperature between 200 and 400o
C, which limits their
applications to flammable gases and some special conditions
such as being as biosensors. Recently, many efforts aimed to
improve gas sensor performance. The research on
nanostructures, giving rise to an increased specific surface
area, has brought to significant improvement in sensitivity.
Additionally, theoretical models have been developed to
justify the size-dependent behaviour of the gas response of
nanocrystalline oxides. Moreover, addition of catalysts and/or
dopants has been used to obtain a better selectivity; however,
stable chemoresistive gas sensors can be obtained only by
preparing materials and sensing layers with well controlled
morphological, structural and electrical properties.Based on X-Ray diffraction (XRD) analysis on solgel
resulted
of stirring rate 600 rpm, 700 rpm and 800 rpm, it
shown that there are phase changed anatase phase (raw
material) into unstable phase orthorombic titanium oxide
sulfate (TiOSO
). After sintering at 700 ͦ C, there are phase
transformation from titanium oxide sulfat (TiOSO
4
into
anatase titanium dioxide (TiO
) again. However, the
combination of stiring rate 700 rpm and 800 rpm followed by sintering at 700 ͦ C hopefully can reduce titanium cation or
vacancy cation. Based on scanning electron microscope (SEM)
analysis, as-received powder titanium dioxide had circularshape
particle. After sol-gel method in titanium dioxide
ceramic material which dissolved with 98 % sulfat acid
(H
2
SO
) produce titanium dioxide microstructure capsul shape,
look like rice particle. Stiring rate on 700 rpm and 800 rpm
can reduce the size up to 120 nm. Stiring rate on 600 rpm
followed sintering at 700
4
o
C resulted large porosity up to 20
μm, stiring rate 700 rpm had resulted porosity size up to 5 μm
and 800 rpm had resulted homogeneity. It can conclude that
best product is stirring rate 800 rpm followed by sintering. | en_US |
