Tunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles

Handle URI:
http://hdl.handle.net/10754/564019
Title:
Tunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticles
Authors:
Parida, Manas R.; Aly, Shawkat Mohammede ( 0000-0002-0455-1892 ) ; Alarousu, Erkki; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
We investigated the impact of the molecular structure of cationic porphyrins on the degree of electrostatic interactions with zinc oxide nanoparticles (ZnO NPs) using steady-state and time-resolved fluorescence and transient absorption spectroscopy. Our results demonstrate that the number of cationic pyridinium units has a crucial impact on the photophysics of the porphyrin macrocycle. Fluorescence enhancement, relative to initial free porphyrin fluorescence, was found to be tuned from 3.4 to 1.3 times higher by reducing the number of cationic substituents on the porphyrin from 4 to 2. The resulting enhancement of the intensity of the fluorescence is attributed to the decrease in the intramolecular charge transfer (ICT) character between the porphyrin cavity and its meso substituent. The novel findings reported in this work provide an understanding of the key variables involved in nanoassembly, paving the way toward optimizing the interfacial chemistry of porphyrin-ZnO NP assembly for photodynamic therapy and energy conversion.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC); Chemical Science Program
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry C
Issue Date:
23-Jan-2015
DOI:
10.1021/jp511740t
Type:
Article
ISSN:
19327447
Sponsors:
S.M.A. is grateful for the postdoctoral fellowship provided by Saudi Basic Industries Corp. (SABIC). The work reported here was supported by King Abdullah University of Science and Technology.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorParida, Manas R.en
dc.contributor.authorAly, Shawkat Mohammedeen
dc.contributor.authorAlarousu, Erkkien
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2015-08-03T12:28:40Zen
dc.date.available2015-08-03T12:28:40Zen
dc.date.issued2015-01-23en
dc.identifier.issn19327447en
dc.identifier.doi10.1021/jp511740ten
dc.identifier.urihttp://hdl.handle.net/10754/564019en
dc.description.abstractWe investigated the impact of the molecular structure of cationic porphyrins on the degree of electrostatic interactions with zinc oxide nanoparticles (ZnO NPs) using steady-state and time-resolved fluorescence and transient absorption spectroscopy. Our results demonstrate that the number of cationic pyridinium units has a crucial impact on the photophysics of the porphyrin macrocycle. Fluorescence enhancement, relative to initial free porphyrin fluorescence, was found to be tuned from 3.4 to 1.3 times higher by reducing the number of cationic substituents on the porphyrin from 4 to 2. The resulting enhancement of the intensity of the fluorescence is attributed to the decrease in the intramolecular charge transfer (ICT) character between the porphyrin cavity and its meso substituent. The novel findings reported in this work provide an understanding of the key variables involved in nanoassembly, paving the way toward optimizing the interfacial chemistry of porphyrin-ZnO NP assembly for photodynamic therapy and energy conversion.en
dc.description.sponsorshipS.M.A. is grateful for the postdoctoral fellowship provided by Saudi Basic Industries Corp. (SABIC). The work reported here was supported by King Abdullah University of Science and Technology.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleTunable photophysical processes of porphyrin macrocycles on the surface of ZnO nanoparticlesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentChemical Science Programen
dc.identifier.journalThe Journal of Physical Chemistry Cen
dc.contributor.institutionChemistry Department, Faculty of Science, Assiut University, Egypten
kaust.authorParida, Manas R.en
kaust.authorAly, Shawkat Mohammedeen
kaust.authorAlarousu, Erkkien
kaust.authorMohammed, Omar F.en
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