Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges

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dc.contributor.author Perera, Dimuthu
dc.contributor.author Lorek, Ryan
dc.contributor.author Khnayzer, Rony S.
dc.contributor.author Moroz, Pavel
dc.contributor.author O'Connor, Timothy
dc.contributor.author Khon, Dimitry
dc.contributor.author Diedrich, Geoffrey
dc.contributor.author Kinder, Erich
dc.date.accessioned 2017-11-03T10:33:06Z
dc.date.available 2017-11-03T10:33:06Z
dc.date.copyright 2012 en_US
dc.date.issued 2017-11-03
dc.identifier.issn 1932-7455 en_US
dc.identifier.uri http://hdl.handle.net/10725/6497
dc.description.abstract The present study investigates the photocatalytic activity of ZnSe/CdS core/shell semiconductor nanocrystals. These nanoparticles exhibit a spatial separation of photoinduced charges between the core and the shell domains, which makes them potentially viable for photocatalytic applications. Unfortunately, one of the excited charges remains inside the core semiconductor and thus cannot efficiently react with the external environment. Here, we explore this issue by investigating the mechanisms of hole extraction from the ZnSe core to the surface of the CdS shell. In particular, the effect of shell thickness in ZnSe/CdS core/shell nanocrystals on the ability of core-localized charges to perform oxidative reactions was determined. By using a combination of time-resolved spectroscopy and electrochemical techniques, we demonstrate that the use of hole-scavenging surfactants facilitates an efficient transfer of core-localized holes to the surface even in the case of shells exceeding 7 nm in thickness. These measurements further demonstrate that photoinduced holes can be extracted from the core faster than they recombine with shell-localized electrons, indicating that most of the absorbed energy in ZnSe/CdS nanocrystals can be used to drive catalytic reactions. en_US
dc.language.iso en en_US
dc.title Photocatalytic activity of core/shell semiconductor nanocrystals beaturing spatial separation of charges en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SAS en_US
dc.author.idnumber 200501196 en_US
dc.author.department Natural Sciences en_US
dc.description.embargo N/A en_US
dc.relation.journal Journal of Physical Chemistry C en_US
dc.journal.volume 116 en_US
dc.journal.issue 43 en_US
dc.article.pages 22786-22793 en_US
dc.identifier.doi http://dx.doi.org/10.1021/jp308921s en_US
dc.identifier.ctation Perera, D., Lorek, R., Khnayzer, R. S., Moroz, P., O’Connor, T., Khon, D., ... & Zamkov, M. (2012). Photocatalytic activity of core/shell semiconductor nanocrystals featuring spatial separation of charges. The Journal of Physical Chemistry C, 116(43), 22786-22793. en_US
dc.author.email rony.khnayzer@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url http://pubs.acs.org/doi/abs/10.1021/jp308921s en_US
dc.orcid.id https://orcid.org/0000-0001-7775-0027 en_US
dc.author.affiliation Lebanese American University en_US

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