Schoenmaker, Job (H.T.) (2023) pH Sensitivity of Electrically Conductive Polypyrrole via Oxidative Chemical Vapor Deposition. Master's Thesis / Essay, Chemical Engineering.
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Abstract
Electrically conductive polypyrrole is synthesized through oxidative chemical vapor deposition (oCVD). oCVD processability is demonstrated by the fabrication of an electrospun fiber mat deposited with polypyrrole. It is shown that polypyrrole is sensitive to pH. oCVD parameters and substrates are tested for pH sensing performance and oCVD is additionally investigated for substrate independence. The limit of detection (LOD) of polypyrrole-based material for pH sensing was found to be competitive with glass-electrode pH sensors at 0.007 pH unit. The chemical changes of polypyrrole as a result of pH exposure are analyzed and correlated to the electrical conductive changes observed. The deprotonation due to pH exposure is followed by various analyzation techniques where the influence of the polaron units, bipolaron units and dopant level in the polymer chains related to electrical conductivity is showcased. XPS analysis indicates deprotonation of polypyrrole by pH exposure occurs through the removal of bipolaron and polaron units from the polypyrrole chain. Infrared spectra of oCVD polypyrrole show a particularly distinctive polaron and bipolaron band splitting with deprotonation. This effect suggests a relation of the ratio of polaron and bipolaron band absorption to the deprotonation and is displayed by an effective polaron contribution parameter.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Bose, R.K. and Kottapalli, A.G.P. |
| Degree programme: | Chemical Engineering |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 08 May 2023 09:48 |
| Last Modified: | 08 May 2023 09:48 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/29633 |
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