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Electronic and structural properties of the natural dyes curcumin, bixin and indigo
An optical, electronic and structural characterisation of three natural dyes potentially interesting for application in organic solar cells, curcumin (C(21)H(20)O(6)), bixin (C(25)H(30)O(4)) and indigo (C(16)H(10)N(2)O(2)), was performed. X-Ray Diffraction (XRD) measurements, showed that curcumin ha...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8697756/ https://www.ncbi.nlm.nih.gov/pubmed/35423953 http://dx.doi.org/10.1039/d0ra08474c |
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author | Michels, Leander Richter, Annika Chellappan, Rajesh K. Røst, Håkon I. Behsen, Alenka Wells, Kristin H. Leal, Luciano Santana, Vilany Blawid, Rosana da Silva, Geraldo J. Cooil, Simon P. Wells, Justin W. Blawid, Stefan |
author_facet | Michels, Leander Richter, Annika Chellappan, Rajesh K. Røst, Håkon I. Behsen, Alenka Wells, Kristin H. Leal, Luciano Santana, Vilany Blawid, Rosana da Silva, Geraldo J. Cooil, Simon P. Wells, Justin W. Blawid, Stefan |
author_sort | Michels, Leander |
collection | PubMed |
description | An optical, electronic and structural characterisation of three natural dyes potentially interesting for application in organic solar cells, curcumin (C(21)H(20)O(6)), bixin (C(25)H(30)O(4)) and indigo (C(16)H(10)N(2)O(2)), was performed. X-Ray Diffraction (XRD) measurements, showed that curcumin has a higher degree of crystallinity compared to bixin and indigo. The results from the Pawley unit cell refinements for all dyes are reported. Optical absorption spectra measured by UV-Visible Spectroscopy (UV-Vis) on thermally evaporated films revealed that bixin undergoes chemical degradation upon evaporation, while curcumin and indigo appear to remain unaffected by this process. Combined Ultraviolet Photoemission Spectroscopy (UPS) and Inverse Photoemission Spectroscopy (IPES) spectra measured on the dyes revealed that all of them are hole-conducting materials and allowed for the determination of their electronic bandgaps, and Fermi level position within the gap. UV Photo-Emission Electron Microscopy (PEEM) revealed the workfunction of the dye materials and indicated that indigo has a negative electron affinity. PEEM was also used to study degradation by UV irradiation and showed that they are quite robust to UV exposure. |
format | Online Article Text |
id | pubmed-8697756 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-86977562022-04-13 Electronic and structural properties of the natural dyes curcumin, bixin and indigo Michels, Leander Richter, Annika Chellappan, Rajesh K. Røst, Håkon I. Behsen, Alenka Wells, Kristin H. Leal, Luciano Santana, Vilany Blawid, Rosana da Silva, Geraldo J. Cooil, Simon P. Wells, Justin W. Blawid, Stefan RSC Adv Chemistry An optical, electronic and structural characterisation of three natural dyes potentially interesting for application in organic solar cells, curcumin (C(21)H(20)O(6)), bixin (C(25)H(30)O(4)) and indigo (C(16)H(10)N(2)O(2)), was performed. X-Ray Diffraction (XRD) measurements, showed that curcumin has a higher degree of crystallinity compared to bixin and indigo. The results from the Pawley unit cell refinements for all dyes are reported. Optical absorption spectra measured by UV-Visible Spectroscopy (UV-Vis) on thermally evaporated films revealed that bixin undergoes chemical degradation upon evaporation, while curcumin and indigo appear to remain unaffected by this process. Combined Ultraviolet Photoemission Spectroscopy (UPS) and Inverse Photoemission Spectroscopy (IPES) spectra measured on the dyes revealed that all of them are hole-conducting materials and allowed for the determination of their electronic bandgaps, and Fermi level position within the gap. UV Photo-Emission Electron Microscopy (PEEM) revealed the workfunction of the dye materials and indicated that indigo has a negative electron affinity. PEEM was also used to study degradation by UV irradiation and showed that they are quite robust to UV exposure. The Royal Society of Chemistry 2021-04-19 /pmc/articles/PMC8697756/ /pubmed/35423953 http://dx.doi.org/10.1039/d0ra08474c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Michels, Leander Richter, Annika Chellappan, Rajesh K. Røst, Håkon I. Behsen, Alenka Wells, Kristin H. Leal, Luciano Santana, Vilany Blawid, Rosana da Silva, Geraldo J. Cooil, Simon P. Wells, Justin W. Blawid, Stefan Electronic and structural properties of the natural dyes curcumin, bixin and indigo |
title | Electronic and structural properties of the natural dyes curcumin, bixin and indigo |
title_full | Electronic and structural properties of the natural dyes curcumin, bixin and indigo |
title_fullStr | Electronic and structural properties of the natural dyes curcumin, bixin and indigo |
title_full_unstemmed | Electronic and structural properties of the natural dyes curcumin, bixin and indigo |
title_short | Electronic and structural properties of the natural dyes curcumin, bixin and indigo |
title_sort | electronic and structural properties of the natural dyes curcumin, bixin and indigo |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8697756/ https://www.ncbi.nlm.nih.gov/pubmed/35423953 http://dx.doi.org/10.1039/d0ra08474c |
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