Fabrication and charaterisation of the electrical and physical properties of the graphite paste electrodes for application in biochemistry sensing
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 p...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Thesis |
| Published: |
2012
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6903/ http://eprints.uthm.edu.my/6903/1/STG_0989.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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. |
|---|