Fabrication and charaterisation of the electrical and physical properties of the graphite paste electrodes for application in biochemistry sensing

Soon, Chin Fhong and Samion, Norhafiza (2012) Fabrication and charaterisation of the electrical and physical properties of the graphite paste electrodes for application in biochemistry sensing. Other thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Biochemistry and heavy metal contamination in waste water are problems of paramount concern. Instant measurement of the degree of contamination is the long term aim of this work This project proposed the fabrication of mask printed graphite electrodes based on natural graphite, micronized graphite powder and carbon composite (HSF54) that have potential for sensing heavy metal in water. The graphite paste were * prepared by mixing silicone oil and graphite powder at certain ratios and they were coated via a mask on a paper substrate using squeegee method. A two-probe station, a field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS) and contact angle measurement system were applied to investigate the electrical and physical properties of the electrodes. Contact angle measurement device was developed and used in determining the wettability of the electrodes. The results show that natural and micronized graphite paste electrode has a mean resistivity of 1.69 x 10" am and 1.25 x 10" Rm, respectively for a thickness of approximately 100 pm. Comparatively, HSF54 has a lower resistivity in the range of x10-' Rm. The huge difference found in the conductivity of both type of electrodes was associated with the particle gap size (percolation), density, dimension of graphite electrodes and the presence of a binder. Based on the contact angle obtained, the critical surface tensions of the natural graphite planar electrode, micronized graphite planar electrode and HSF 54 electrodes are 38, 34 and 37 mN/m, respectively. The three types of graphite planar electrodes were found to be moderately hydrophobic relatively. The ability of the electrodes to be wetted by water shows that it is a good candidate to interact with the biochemistry or heavy metal contaminants in waste water.

Item Type:Thesis (Other)
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD169-171 Environmental protection. Environmental geotechnology
ID Code:6903
Deposited By:Normajihan Abd. Rahman
Deposited On:14 May 2015 14:44
Last Modified:14 May 2015 14:44

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