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Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application
Dissertation (MSc (Chemistry))--University of Pretoria, 2022.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2023
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| _version_ | 1867613586474401792 |
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| access_status_str | Open Access |
| author2 | Radhakrishnan, Shankara Gayathri |
| author_browse | Radhakrishnan, Shankara Gayathri |
| author_facet | Radhakrishnan, Shankara Gayathri |
| collection | Thesis |
| dc_rights_str_mv | © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Chemistry))--University of Pretoria, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/89619 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:29.922Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/89619 Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application Radhakrishnan, Shankara Gayathri u14245842@tuks.co.za Mosana, Mokgadi Josephine Refilwe UCTD Phthalocyanines Conjugated polymers UV vis spectroscopy Fluorescence Binding constants Dissertation (MSc (Chemistry))--University of Pretoria, 2022. Supramolecular complex formation using donor and acceptor macrocycles are important field of research in solar energy harvesting. In this study, multiwalled carbon nanotubes is used as an acceptor and its associative interactions with macrocyclic and polymeric donors such as phthalocyanines (free base H2 and Mn centred) and Poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) were studied using absorption and emission spectroscopy, electrochemical methods and transmission electron microscopy. The calculated molar extinction coefficients and fluorescence quantum yield values show that the selected donors not only strongly absorb at high wavelengths but also at lower concentrations they effectively release excited state charge at 600 nm (for phthalocyanines) and 624 nm (for polymeric donor). This is further corroborated by the binding constants obtained during this study. The binding constants as calculated from the spectroscopic methods (ranging from 103 to 106 for the macrocycles to polymer) with that of electrochemical methods indicated a similar trend. This was further validated by the low-resolution TEM studies which indicated the decoration of MWCNT with the donors used. Thus, MnPc and PCPDTBT were the most stable of the complexes showing a good promise to find application as active materials in organic photovoltaics. National Research Foundation (NRF) Chemistry MSc (Chemistry) Unrestricted 2023-02-16T08:53:12Z 2023-02-16T08:53:12Z 2023-04 2022-12 Dissertation * A2023 https://repository.up.ac.za/handle/2263/89619 https://doi.org/10.25403/UPresearchdata.22104812.v1 en © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Phthalocyanines Conjugated polymers UV vis spectroscopy Fluorescence Binding constants Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| title | Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| title_full | Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| title_fullStr | Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| title_full_unstemmed | Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| title_short | Optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| title_sort | optical and electrochemical study of discrete supramolecular complexes for organic photovoltaic application |
| topic | UCTD Phthalocyanines Conjugated polymers UV vis spectroscopy Fluorescence Binding constants |
| url | https://repository.up.ac.za/handle/2263/89619 https://doi.org/10.25403/UPresearchdata.22104812.v1 |