Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals

Yixuan Yu; Clare E. Rowland; Richard D. Schaller; Brian A. Korgel

doi:10.1021/acs.langmuir.5b01246

Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals

Yixuan Yu, Clare E. Rowland, Richard D. Schaller, Brian A. Korgel^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Hydride-terminated silicon (Si) nanocrystals were capped with dodecanethiol by a thermally promoted thiolation reaction. Under an inert atmosphere, the thiol-capped nanocrystals exhibit photoluminescence (PL) properties similar to those of alkene-capped Si nanocrystals, including size-tunable emission wavelength, relatively high quantum yields (>10%), and long radiative lifetimes (26-280 μs). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed that the ligands attach to the nanocrystal surface via covalent Si-S bonds. The thiol-capping layer, however, readily undergoes hydrolysis and severe degradation in the presence of moisture. Dodecanethiol could be exchanged with dodecene by hydrosilylation for enhanced stability.

Original language	English (US)
Pages (from-to)	6886-6893
Number of pages	8
Journal	Langmuir
Volume	31
Issue number	24
DOIs	https://doi.org/10.1021/acs.langmuir.5b01246
State	Published - Jun 23 2015

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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title = "Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals",

abstract = "Hydride-terminated silicon (Si) nanocrystals were capped with dodecanethiol by a thermally promoted thiolation reaction. Under an inert atmosphere, the thiol-capped nanocrystals exhibit photoluminescence (PL) properties similar to those of alkene-capped Si nanocrystals, including size-tunable emission wavelength, relatively high quantum yields (>10%), and long radiative lifetimes (26-280 μs). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed that the ligands attach to the nanocrystal surface via covalent Si-S bonds. The thiol-capping layer, however, readily undergoes hydrolysis and severe degradation in the presence of moisture. Dodecanethiol could be exchanged with dodecene by hydrosilylation for enhanced stability.",

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AU - Yu, Yixuan

AU - Rowland, Clare E.

AU - Schaller, Richard D.

AU - Korgel, Brian A.

PY - 2015/6/23

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AB - Hydride-terminated silicon (Si) nanocrystals were capped with dodecanethiol by a thermally promoted thiolation reaction. Under an inert atmosphere, the thiol-capped nanocrystals exhibit photoluminescence (PL) properties similar to those of alkene-capped Si nanocrystals, including size-tunable emission wavelength, relatively high quantum yields (>10%), and long radiative lifetimes (26-280 μs). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed that the ligands attach to the nanocrystal surface via covalent Si-S bonds. The thiol-capping layer, however, readily undergoes hydrolysis and severe degradation in the presence of moisture. Dodecanethiol could be exchanged with dodecene by hydrosilylation for enhanced stability.

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