Size and emission color tuning in the solution phase synthesis of highly luminescent germanium nanocrystals

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dc.contributor.author Carolan, Darragh
dc.contributor.author Doyle, Hugh
dc.date.accessioned 2016-05-05T12:20:54Z
dc.date.available 2016-05-05T12:20:54Z
dc.date.issued 2014-03-21
dc.identifier.citation CAROLAN, D. & DOYLE, H. 2014. Size and emission color tuning in the solution phase synthesis of highly luminescent germanium nanocrystals. Journal of Materials Chemistry C, 2, pp. 3562-3568. doi: 10.1039/C4TC00319E en
dc.identifier.volume 2 en
dc.identifier.startpage 3562 en
dc.identifier.endpage 3568 en
dc.identifier.issn 2050-7526
dc.identifier.uri http://hdl.handle.net/10468/2508
dc.identifier.doi 10.1039/C4TC00319E
dc.description.abstract Highly luminescent germanium nanocrystals (NCs) are synthesized at room temperature by hydride reduction of germanium tetrachloride (GeCl4) within inverse micelles. Regulation of the Ge NC size is achieved by varying the alkyl chain length of the cationic quaternary ammonium surfactants used to form the inverse micelles. The Ge NCs are chemically passivated with allylamine ligands using a Pt-catalyzed hydrogermylation reaction, minimizing surface oxidation while rendering the NCs dispersible in a range of polar solvents. Transmission electron microscopy shows that the NCs are highly crystalline with well-defined core diameters tuned from 3 to 5 nm. UV-Vis absorbance and photoluminescence (PL) spectroscopy show significant quantum confinement effects, with moderate absorption in the UV spectral range, and a strong, narrow luminescence in the visible with a marked dependency on excitation wavelength. A maximum quantum yield of 20% is shown for the nanocrystals, and a transition from primarily blue to green emission is observed as the NC diameter increases to 4.5 nm. en
dc.description.sponsorship European Commission (FP7 Projects: SNAPSUN, grant agreement no. 246310; CommonSense, grant agreement no. 261809); Higher Education Authority (PRTLI programs: Cycle 3 “Nanoscience” and Cycle 4 “INSPIRE”) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher The Royal Society of Chemistry en
dc.rights.uri © 2014, the Authors. en
dc.subject Solvents en
dc.subject Cationic surfactants en
dc.subject Luminescence en
dc.subject Micelles en
dc.subject Nanocrystals en
dc.subject Photoluminescence spectroscopy en
dc.subject Surface reactions en
dc.subject Transmission electron microscopy en
dc.title Size and emission color tuning in the solution phase synthesis of highly luminescent germanium nanocrystals en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Hugh Doyle, Micro-Nanoelectronics Centre, Tyndall National Institute, Cork, Ireland. +353-21-490-4310 Email: hugh.doyle@tyndall.ie en
dc.internal.availability Full text available en
dc.date.updated 2016-04-10T17:53:48Z
dc.description.version Accepted Version en
dc.internal.rssid 271354609
dc.internal.wokid 000334998900010
dc.contributor.funder Higher Education Authority en
dc.contributor.funder European Commission
dc.description.status Peer reviewed en
dc.identifier.journaltitle Journal of Materials Chemistry C en
dc.internal.copyrightchecked Yes. !!CORA!! AV permitted by the publisher: "Accepted manuscripts may be distributed via repositories after an embargo period of 12 months". Must include a link to the version of record. http://www.rsc.org/journals-books-databases/open-access/green-open-access/ en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress hugh.doyle@tyndall.ie en


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