期刊
ACS NANO
卷 8, 期 9, 页码 9636-9648出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn504109a
关键词
silicon nanocrystals; photoluminescence; ligands; surface states; quantum dots; excited-state lifetimes
类别
资金
- National Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Alberta Science and Research Investment Program (ASRIP)
- Alberta Innovates Technology Futures (AITF)
- iCiNano (iCORE Centre for Interdisciplinary Nanoscience)
- AITF
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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