Graphene nanoreactors : photoreduction of prussian blue in aqueous solution

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dc.citation.epage22233en_US
dc.citation.issueNumber40en_US
dc.citation.spage22225en_US
dc.citation.volumeNumber121en_US
dc.contributor.authorNappini, Silviaen_US
dc.contributor.authorMatruglio, Alessiaen_US
dc.contributor.authorNaumenko, Denysen_US
dc.contributor.authorDal Zilio, Simoneen_US
dc.contributor.authorLazzarino, Marcoen_US
dc.contributor.authorDe Groot, Frank M.F.en_US
dc.contributor.authorKocabaş, Coşkunen_US
dc.contributor.authorBalcı, Osmanen_US
dc.contributor.authorMagnano, Elenaen_US
dc.date.accessioned2018-04-12T11:09:02Z
dc.date.available2018-04-12T11:09:02Z
dc.date.issued2017en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractPrussian dyes are characterized by interesting photomagnetic properties due to the photoinduced electron transfer involved in the Fe oxidation and spin state changes. Ferromagnetic Prussian blue (PB) in contact with titanium dioxide (TiO2) can be reduced to paramagnetic Prussian white (PW) upon UV band gap excitation of TiO2. This process is promoted by the presence of a hole scavenger, such as water, fundamental to ensure the overall charge balance and the continuity of the process. In order to clarify the photoinduced reduction mechanism and the role of water, an innovative system of graphene nanobubbles (GNBs) filled with a PB aqueous solution was developed, enabling the application of electron spectroscopies to the liquid phase, up to now limited by the vacuum required to overcome the short electron inelastic mean free path in dense medium. In this work GNBs formed on the photocatalytic substrate are able to act as "nanoreactors", and they can control and take part in the reaction. The evolution of Fe L2,3 edge X-ray absorption spectra measured in total electron yield through the graphene membrane revealed the electron reduction from PB (FeIII-CN-FeII) to PW (FeII-CN-FeII) upon UV irradiation, shedding light on the photoinduced electron transfer mechanism in liquid phase. The results, confirmed also by Raman spectroscopy, unequivocally demonstrate that the reaction occurs preferentially in aqueous solution, where water acts as hole scavenger.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T11:09:02Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2017en
dc.identifier.doi10.1021/acs.jpcc.7b07898en_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/37295
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acs.jpcc.7b07898en_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.subjectRedox reactionsen_US
dc.subjectOxidesen_US
dc.subjectPhotoinduced electronsen_US
dc.subjectSolution chemistryen_US
dc.subjectIrradiationen_US
dc.titleGraphene nanoreactors : photoreduction of prussian blue in aqueous solutionen_US
dc.typeArticleen_US

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