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Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods
A Thesis submitted to the Department Of Physics, Kwame Nkrumah University of Science and Technology, in partial fulfillment of the requirement for the degree of MASTER OF PHILOSOPHY (MATERIALS SCIENCE) College of Science
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| Format: | Thesis |
| Language: | English |
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KNUST
2026
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| _version_ | 1867613139032342528 |
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| access_status_str | Open Access |
| author | AWUAH, Joseph Asare |
| author_browse | AWUAH, Joseph Asare |
| author_facet | AWUAH, Joseph Asare |
| author_sort | AWUAH, Joseph Asare |
| collection | Thesis |
| description | A Thesis submitted to the Department Of Physics, Kwame Nkrumah University of
Science and Technology, in partial fulfillment of the requirement for the degree of
MASTER OF PHILOSOPHY (MATERIALS SCIENCE)
College of Science |
| format | Thesis |
| id | oai:ir.knust.edu.gh:123456789/17704 |
| institution | KNUST (Ghana) |
| language | English |
| last_indexed | 2026-06-10T12:31:23.640Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from KNUSTSpace — Kwame Nkrumah University of Science & Technology (Ghana) |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| publisher | KNUST |
| publisherStr | KNUST |
| record_format | dspace |
| source_str | KNUSTSpace — Kwame Nkrumah University of Science & Technology (Ghana) |
| spelling | oai:ir.knust.edu.gh:123456789/17704 Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods AWUAH, Joseph Asare A Thesis submitted to the Department Of Physics, Kwame Nkrumah University of Science and Technology, in partial fulfillment of the requirement for the degree of MASTER OF PHILOSOPHY (MATERIALS SCIENCE) College of Science Polyaniline salts (PANI-ES) were synthesized by chemical and electrochemical oxidation using primary dopants such as HCL, HNO3, H2SO4 and CH3COOH and the aniline as the monomer. All the synthesized PANI have resulted in emeraldine salts form as indicated by dark green colour of the salts. Various characterization techniques employed were UV-Visible spectroscopy, FT-IR and Cyclic voltammetery studies. All these techniques confirm the various properties of PANI. The characteristic bands in UV-Visible spectra of the samples indicate that effective doping has occurred in the synthesized polymer. Quinoid and benzenoid peaks at 1553-1596 cm- 1 and 1437 – 1496 cm-1 respectively were observed in all the samples. The band gaps for all the samples, both bulk and thin film, were obtained using the absorption spectra and Stern relation. PANI-H2SO4 had the least band gap for both bulk and thin film samples whereas PANI CH3COOH had the highest band gap. The voltammogram showed the various oxidation states during the electrochemical deposition at potential of 0.8 V. Four probe method was used to study the conductivity of both thin and bulk samples. The conductivity values for PANI-H2SO4 were found to be highest i.e. 1.183 S.cm−1 and 3.424 S.cm−1 for bulk and thin film respectively KNUST 2026-06-03T15:23:35Z 2026-06-03T15:23:35Z 2019-08-25 Thesis https://ir.knust.edu.gh/handle/123456789/17704 en application/pdf KNUST |
| spellingShingle | AWUAH, Joseph Asare Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods |
| title | Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods |
| title_full | Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods |
| title_fullStr | Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods |
| title_full_unstemmed | Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods |
| title_short | Effects of dopants on the conductivity of polyaniline Synthesized by chemical oxidation and electrochemical methods |
| title_sort | effects of dopants on the conductivity of polyaniline synthesized by chemical oxidation and electrochemical methods |
| url | https://ir.knust.edu.gh/handle/123456789/17704 |
| work_keys_str_mv | AT awuahjosephasare effectsofdopantsontheconductivityofpolyanilinesynthesizedbychemicaloxidationandelectrochemicalmethods |