Holmes, Alexandra L., Huetges, Jeanette, Reckmann, Anna, Muthuswamy, Elayaraja, Meerholz, Klaus ORCID: 0000-0001-7450-4672 and Kauzlarich, Susan M. (2015). Probing Electronics as a Function of Size and Surface of Colloidal Germanium Nanocrystals. J. Phys. Chem. C, 119 (10). S. 5671 - 5679. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7447

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Abstract

Inorganic semiconductor nanoparticles are of significant interest for applications that benefit from their size-dependent properties. The work presented here focuses on the characterization of solution-based microwave synthesized Ge nanocrystals (NCs). Three differently capped Ge NCs were investigated: oleylamine (OAM), dodecanethiol (DDT), and a functionalized N4,N4,N4',N4'-tetraphenylbiphenyl-4,4'-diamine (TPD) ligand, which is commonly used as hole-transporting units. The optical gaps followed the expected trend for quantum confinement; however, the absolute value depended upon the ligand. We found that the DDT-capped Ge NCs feature consistently larger bandgaps than OAM-capped Ge NCs of a similar size. Cyclic voltammetry (CV) was used to determine the valence band energy for OAM-capped Ge NCs, and the conduction band energy was estimated from the optical gap. By contrast, DDT-capped Ge NCs and the OAM/DDT-capped Ge NCs did not exhibit an oxidative signal in the cyclic voltammetry. This was attributed to the removal of surface defects of OAM-capped Ge NCs through stronger Ge-S surface bonds. TPD-capped Ge NCs were investigated and showed a shift to slightly higher oxidation potential compared with the free ligand and bandgap values in between that of the OAM-capped and DDT-capped Ge NCs. The higher oxidation potential is attributed to TPD orientation, and the bandgap value reflects the lower number of Ge-S bonds on the surface due to ligand sterics.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Holmes, Alexandra L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huetges, JeanetteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reckmann, AnnaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muthuswamy, ElayarajaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meerholz, KlausUNSPECIFIEDorcid.org/0000-0001-7450-4672UNSPECIFIED
Kauzlarich, Susan M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-409874
DOI: 10.1021/jp511929v
Journal or Publication Title: J. Phys. Chem. C
Volume: 119
Number: 10
Page Range: S. 5671 - 5679
Date: 2015
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1932-7447
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
QUANTUM CONFINEMENT; CYCLIC VOLTAMMETRY; NANOPARTICLES; ELECTROCHEMISTRY; MONOLAYERS; CHEMISTRY; FILMS; DOTS; GAP; GEMultiple languages
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/40987

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