Electrophoretic Deposition of Oxidized Multi-Walled Carbon Nanotubes on Stainless Steel for LPG Sensor
Date
2023
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Chemistry
Abstract
This dissertation research describes the feasibility study and investigation of
Electrophoretic Deposition of oxidized MWCNTs on stainless steel for LPG sensor.
Gas sensors are attracting tremendous interest because of their wide spread
application in industry, environmental monitoring, space exploration, biomedicine
and pharmaceuticals. Gas sensors with high sensitivity and selectivity are required for
leakage detection of explosive gases such as hydrogen, and for real time detection of
toxic and pathogenic gases in industries. There is also a strong demand for the ability
to monitor and control our ambient environment, especially with the increasing
concern of global warming. MWCNTs are used to obtain thin film by Electrophoretic
Deposition. Before deposition MWCNTs were purified and surface functionalized by
conc. HNO
3
. The oxidized MWCNTs were characterized by FTIR. FTIR shows the
presence of oxygenated functionalized groups as carboxylic acid and hydroxyl group
on the surface of MWCNTs. The uniform Electrophoretic deposition of MWCNTs are
confirmed by SEM. Raman spectroscopy confirmed the deposited material was
MWCNTs.
The EPD experiments were carried out by using oxidized MWCNTs on stainless steel
plate at 10V at a constant time of 10 min. and fix electrode distance of 1.5 cm.
Modification of carbon nanotubes with functional groups will greatly enhance the
selectivity of the carbon nanotubes-based gas sensors have proved to work well at
room temperature, which reduces power consumption of the device and enables the
safer detection of flammable gases. The resistance of Electrophoretic deposited
material was measured in closed glass chamber with digital multimeter. Then %
sensitivity was calculated. It was observed that the rate of sensitivity increases with
time and become constant after certain time.
Description
Keywords
LPG sensor, Carbon nanotubes, Electrophoretic deposition, Sensitivity, Oxygenated