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Size vs Surface: Tuning the Photoluminescence of Freestanding Silicon Nanocrystals Across the Visible Spectrum via Surface Groups
Open accessAbstract
The syntheses of colloidal silicon nanocrystals (Si-NCs) with dimensions in the 3-4 nm size regime as well as effective methodologies for their functionalization with alkyl, amine, phosphine, and acetal functional groups are reported. Through rational variation in the surface moieties we demonstrate that the photoluminescence of Si-NCs can be effectively tuned across the entire visible spectral region without changing particle size. The surface-state dependent emission exhibited short-lived excited-states and higher relative photoluminescence quantum yields compared to Si-NCs of equivalent size exhibiting emission originating from the band gap transition. The Si-NCs were exhaustively characterized using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transformed infrared spectroscopy (FTIR), and their optical properties were thoroughly investigated using fluorescence spectroscopy, excited-state lifetime measurements, photobleaching experiments, and solvatochromism studies.
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Metadata
- Authors
- Dasog, M., De los Reyes, G. B., Titova, L. V., Hegmann, F. A., & Veinot, J. G. C.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-09-08
- Volume
- 8
- Issue
- 9
- Pages
- 9636-9648
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2320479047
- Cited by
- 334
- References
- 34
- FWCI
- 16.83
- Type
- journal article
- Language
- en
- Open access
- hybrid
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