Templated growth of oxcba: PFO-DBT nanostructures for humidity sensing application / Muhamad Saipul Fakir
In recent years, research on the production of electronic devices has been emphasized to produce the electronic devices that have a simple production process are more cost effective and have better adaptation to the environment. In order to produce such devices, a variety of organic materials suc...
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| Format: | Thesis |
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2018
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| Online Access: | http://studentsrepo.um.edu.my/8428/1/All.pdf http://studentsrepo.um.edu.my/8428/6/saipul.pdf http://studentsrepo.um.edu.my/8428/ |
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| Summary: | In recent years, research on the production of electronic devices has been emphasized to
produce the electronic devices that have a simple production process are more cost
effective and have better adaptation to the environment. In order to produce such devices,
a variety of organic materials such as polymers and small molecules have been
introduced. Therefore, one of the thiophene-based material, poly[2,7-(9,9-
dioctylfluorene)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PFO-DBT) is used
as the p-type semiconductor material while the fullerene-based material, o-xylenyl-C60-
bisadduct (OXCBA) is used as n-type semiconductor material. Both of them have good
optical properties and are suitable to be used as the active layer for the light-based device.
However, its performance has been limited by the light absorption ability due to the
structural nanoscale constraint. Introducing a nanostructure at the thin film enhanced the
light absorption intensity and can solve the low absorption issue at the thin film. To
overcome these limitations, fabrication of nanostructures such as nanotubes, nanorods
and other novel nanostructures formation are rather essential and pragmatic. Therefore,
the production of nanostructures has been carried out in this study. It was realized by the
assistance of the anodic aluminium oxide (AAO) template. The resulting nanostructures
were varied depending on the deposition technique. The first part of the research is to
deposit the p-type material with different techniques. Solution deposition was done by
the spin coating, immersing and vortex mixing methods. For the spin coating method, the
type and size of nanostructure were varied by varying the solution concentration and spin
rate, while for immersion method, parameters such as solution concentration, immersion
time and type of solvent were varied. In the deposition by vortex mixer, the speed setting
of the instrument was varied in order to get the different vibration strength, besides varying the solution concentration in order to achieve the same objective. Nanorods and
nanotubes were successfully produced by the proposed methods. OXCBA was then
deposited by spin coating method into the preformed PFO-DBT nanotubes. Infiltration of
OXCBA into the hollow space of PFO-DBT nanotube was successfully done and led to
the formation of core-shell OXCBA: PFO-DBT nanocomposite. The second part of this
research has focused on the fabrication of the organic humidity sensor. The presence of a
highly porous surface structure is one of the contributing factors for a better humidity
sensor, which is the novelty of this research. With the high surface area of the structure,
the performance of the sensors in term of their sensitivity, hysteresis value and response
and recovery time for over a wide range of relative humidity level can be enhanced. |
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