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dc.contributor.authorKar, Prasenjit
dc.contributor.authorSardar, Samim
dc.contributor.authorAlarousu, Erkki
dc.contributor.authorSun, Jingya
dc.contributor.authorSeddigi, Zaki Shakir Abdullah
dc.contributor.authorAhmed, Saleh Abdel Mgeed
dc.contributor.authorDanish, Ekram Yousif
dc.contributor.authorMohammed, Omar F.
dc.contributor.authorPal, Samir Kumar
dc.date.accessioned2015-08-03T12:04:52Z
dc.date.available2015-08-03T12:04:52Z
dc.date.issued2014-07-10
dc.identifier.issn09476539
dc.identifier.doi10.1002/chem.201402632
dc.identifier.urihttp://hdl.handle.net/10754/563628
dc.description.abstractProtoporphyrinIX-zinc oxide (PP-ZnO) nanohybrids have been synthesized for applications in photocatalytic devices. High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and steady-state infrared, absorption, and emission spectroscopies have been used to analyze the structural details and optical properties of these nanohybrids. Time-resolved fluorescence and transient absorption techniques have been applied to study the ultrafast dynamic events that are key to photocatalytic activities. The photocatalytic efficiency under visible-light irradiation in the presence of naturally abundant iron(III) and copper(II) ions has been found to be significantly retarded in the former case, but enhanced in the latter case. More importantly, femtosecond (fs) transient absorption data have clearly demonstrated that the residence of photoexcited electrons from the sensitizer PP in the centrally located iron moiety hinders ground-state bleach recovery of the sensitizer, affecting the overall photocatalytic rate of the nanohybrid. The presence of copper(II) ions, on the other hand, offers additional stability against photobleaching and eventually enhances the efficiency of photocatalysis. In addition, we have also explored the role of UV light in the efficiency of photocatalysis and have rationalized our observations from femtosecond- to picosecond-resolved studies. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.description.sponsorshipThe authors would like to acknowledge partial financial support from Umm Al-Qura University. The work is partially supported by King Abdullah University of Science and Technology. P. K. thanks the Council of Scientific and Industrial Research (CSIR, India) for fellowships. S. K. P. thanks the Department of Science and Technology (DST, India) for financial grants.
dc.publisherWiley-Blackwell
dc.subjectfemtochemistry
dc.subjectfemtosecond transient absorption spectroscopy
dc.subjectnanohybrids
dc.subjectporphyrinoids
dc.subjectprotoporphyrinIX
dc.titleImpact of metal ions in porphyrin-based applied materials for visible-light photocatalysis: Key information from ultrafast electronic spectroscopy
dc.typeArticle
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentChemical Science Program
dc.identifier.journalChemistry - A European Journal
dc.contributor.institutionDepartment of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, SaltLake, Kolkata 700 098, India
dc.contributor.institutionDepartment of Environmental Health, Faculty of Public Health and Health Informatics, Umm Al-Qura University, 21955 Makkah, Saudi Arabia
dc.contributor.institutionChemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, 21955 Makkah, Saudi Arabia
dc.contributor.institutionChemistry Department, College of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
kaust.personAlarousu, Erkki
kaust.personMohammed, Omar F.
kaust.personSun, Jingya


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