Size-dependent oxidation of monodisperse silicon nanocrystals with allylphenylsulfide surfaces.
SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015;
11:335-340. [PMID:
25196798 DOI:
10.1002/smll.201401965]
[Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 08/08/2014] [Indexed: 06/03/2023]
Abstract
The synthesis and characterization of size-separated silicon nanocrystals functionalized with a heteroatom-substituted organic capping group, allylphenylsulfide, via photochemical hydrosilylation are described for the first time. These silicon nanocrystals form colloidally stable and highly photoluminescent dispersions in non-polar organic solvents with an absolute quantum yield as high as 52% which is 20% above that of the allylbenzene analogue. Solutions of the size-separated fractions are characterized over time to monitor the effect of aging in air by following the change of their photoluminescence and absolute quantum yields, supplemented by transmission electron microscopy.
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