Efficient one-pot synthesis of monodisperse alkyl-terminated colloidal germanium nanocrystals

dc.contributor.authorCarolan, Darragh
dc.contributor.authorDoyle, Hugh
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderEuropean Commission
dc.date.accessioned2016-05-06T09:26:37Z
dc.date.available2016-05-06T09:26:37Z
dc.date.issued2014-12-04
dc.date.updated2016-04-10T17:57:00Z
dc.description.abstractAn efficient one-pot method for fabricating alkyl-capped germanium nanocrystals (Ge NCs) is reported. Ge NCs with a size of 3.9 ± 0.5 nm, are formed by co-reduction of germanium tetrachloride in the presence of n-butyltrichlorogermane, producing NCs with butyl-terminated surfaces. The advantage of this method is that it allows rapid synthesis and functionalisation of NCs with minimal post-synthetic purification requirements. TEM imaging showed that the Ge NCs are monodisperse and highly crystalline, while EDX and SAED confirmed the chemical identity and crystal phase of the NCs. FTIR and XPS confirmed that the Ge NCs were well passivated, with some oxidation of the nanocrystal surface. Optical spectroscopy of the NCs showed a strong absorbance in the UV region and an excitation wavelength dependent photoluminescence in the UV/violet. Time resolved photoluminescence measurements showed the presence of two nanosecond lifetime components, consistent with recombination of photogenerated excitons at low lying energy states present at the nanocrystal surface. Photoluminescence quantum yields were determined to be 37 %, one of the highest values reported for organically terminated Ge NCs.en
dc.description.sponsorshipEuropean Commission (FP7 Projects: HYSENS, grant agreement no. 263091; CommonSense, grant agreement no. 261809); Higher Education Authority (PRTLI program: 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. Efficient one-pot synthesis of monodisperse alkyl-terminated colloidal germanium nanocrystals. Journal of Nanoparticle Research, 16, pp. 1-8. doi: 10.1007/s11051-014-2721-7en
dc.identifier.doi10.1007/s11051-014-2721-7
dc.identifier.endpage8en
dc.identifier.issn1572-896X
dc.identifier.journaltitleJournal of Nanoparticle Researchen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/2513
dc.identifier.volume16en
dc.language.isoenen
dc.publisherSpringer Science+Business Media B.V.en
dc.rights© 2014, Springer Science+Business Media B.V. The final publication is available at Springer via http://dx.doi.org/10.1007/s11051-014-2721-7en
dc.subjectGermaniumen
dc.subjectPhotoluminescenceen
dc.subjectQuantum yielden
dc.subjectSemiconductorsen
dc.subjectNanoelectronicsen
dc.subjectNanocrystalsen
dc.subjectSynthesisen
dc.titleEfficient one-pot synthesis of monodisperse alkyl-terminated colloidal germanium nanocrystalsen
dc.typeArticle (peer-reviewed)en
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