Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces

Handle URI:
http://hdl.handle.net/10754/575910
Title:
Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces
Authors:
Masih, Dilshad ( 0000-0001-5322-9771 ) ; Aly, Shawkat Mohammede ( 0000-0002-0455-1892 ) ; Usman, Anwar; Alarousu, Erkki; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
We report on the ultrafast interfacial electron transfer ( ET) between zinc( II) porphyrin ( ZnTMPyP) and negatively charged graphene carboxylate ( GC) using state- of- the- art femtosecond laser spectroscopy with broadband capabilities. The steady- state interaction between GC and ZnTMPyP results in a red- shifted absorption spectrum, providing a clear indication for the binding affinity between ZnTMPyP and GC via electrostatic and p- p stacking interactions. Ultrafast transient absorption ( TA) spectra in the absence and presence of three different GC concentrations reveal ( i) the ultrafast formation of singlet excited ZnTMPyP*, which partially relaxes into a long- lived triplet state, and ( ii) ET from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP + and GC , as indicated by a spectral feature at 650- 750 nm, which is attributed to a ZnTMPyP radical cation resulting from the ET process.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Phys. Chem. Chem. Phys.
Issue Date:
25-Feb-2015
DOI:
10.1039/c4cp06050d
Type:
Article
ISSN:
1463-9076; 1463-9084
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorMasih, Dilshaden
dc.contributor.authorAly, Shawkat Mohammedeen
dc.contributor.authorUsman, Anwaren
dc.contributor.authorAlarousu, Erkkien
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2015-08-25T06:19:11Zen
dc.date.available2015-08-25T06:19:11Zen
dc.date.issued2015-02-25en
dc.identifier.issn1463-9076en
dc.identifier.issn1463-9084en
dc.identifier.doi10.1039/c4cp06050den
dc.identifier.urihttp://hdl.handle.net/10754/575910en
dc.description.abstractWe report on the ultrafast interfacial electron transfer ( ET) between zinc( II) porphyrin ( ZnTMPyP) and negatively charged graphene carboxylate ( GC) using state- of- the- art femtosecond laser spectroscopy with broadband capabilities. The steady- state interaction between GC and ZnTMPyP results in a red- shifted absorption spectrum, providing a clear indication for the binding affinity between ZnTMPyP and GC via electrostatic and p- p stacking interactions. Ultrafast transient absorption ( TA) spectra in the absence and presence of three different GC concentrations reveal ( i) the ultrafast formation of singlet excited ZnTMPyP*, which partially relaxes into a long- lived triplet state, and ( ii) ET from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP + and GC , as indicated by a spectral feature at 650- 750 nm, which is attributed to a ZnTMPyP radical cation resulting from the ET process.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleReal-time observation of ultrafast electron injection at graphene–Zn porphyrin interfacesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.identifier.journalPhys. Chem. Chem. Phys.en
kaust.authorMasih, Dilshaden
kaust.authorUsman, Anwaren
kaust.authorAly, Shawkat Mohammedeen
kaust.authorAlarousu, Erkkien
kaust.authorMohammed, Omar F.en
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