Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 6, Pages 3285-3292Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am300642m
Keywords
cellular imaging; semiconductor nanoparticles; surface capping; photoelectron spectroscopy; FTIR; NMR
Funding
- Tyndall studentship
- ORS award
- EPSRC [EP/G01664X/1]
- Engineering and Physical Sciences Research Council [EP/G01664X/1] Funding Source: researchfish
- EPSRC [EP/G01664X/1] Funding Source: UKRI
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Stable and brightly luminescent amine-terminated Si nanoparticles (SiNPs) have been synthesized from electrochemically etched porous silicon (PSi). The surface amine termination was confirmed by FTIR, NMR, and XPS studies. The mean diameter of the crystal core of 4.6 nm was measured by transmission electron microscopy (TEM), which is in a good agreement with the size obtained by dynamic light scattering (DLS). The dry, amine-terminated product can be obtained from bulk silicon wafers in less than 4 h. This represents a significant improvement over similar routines using PSi where times of >10 h are common. The emission quantum yield was found to be about 22% and the nanoparticles exhibited an exceptional stability over a wide pH range (4-14). They are resistant to aging over several weeks. The amine-terminated SiNPs showed no significant cytotoxic effects toward HepG2 cells, as assessed with MTT assays.
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