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

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dc.contributor.authorCarolan, Darragh
dc.contributor.authorDoyle, Hugh
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderEuropean Commission
dc.date.accessioned2016-05-05T12:20:54Z
dc.date.available2016-05-05T12:20:54Z
dc.date.issued2014-03-21
dc.date.updated2016-04-10T17:53:48Z
dc.description.abstractHighly 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.sponsorshipEuropean 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.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationCAROLAN, 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/C4TC00319Een
dc.identifier.doi10.1039/C4TC00319E
dc.identifier.endpage3568en
dc.identifier.issn2050-7526
dc.identifier.journaltitleJournal of Materials Chemistry Cen
dc.identifier.startpage3562en
dc.identifier.urihttps://hdl.handle.net/10468/2508
dc.identifier.volume2en
dc.language.isoenen
dc.publisherThe Royal Society of Chemistryen
dc.rights.uri© 2014, the Authors.en
dc.subjectSolventsen
dc.subjectCationic surfactantsen
dc.subjectLuminescenceen
dc.subjectMicellesen
dc.subjectNanocrystalsen
dc.subjectPhotoluminescence spectroscopyen
dc.subjectSurface reactionsen
dc.subjectTransmission electron microscopyen
dc.titleSize and emission color tuning in the solution phase synthesis of highly luminescent germanium nanocrystalsen
dc.typeArticle (peer-reviewed)en
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