期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 5, 期 7, 页码 1363-1370出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tb02813f
关键词
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资金
- WPI- Program and NIMS Molecule & Material Synthesis Platform in Nanotechnology Platform Project'' both operated by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- MEXT [26390024]
- Sumitomo Foundation
- Grants-in-Aid for Scientific Research [26390024] Funding Source: KAKEN
We report a one-pot synthesis of water dispersible fluorescent silica nanoparticles (NPs) functionalized with terminal amine groups, starting from silicon tetrabromide (SiBr4) and aminopropyltriethoxy silane (APTES). The NPs range from 1 to 2 nm in diameter, and exhibit an intense blue emission with a quantum yield (QY) of around 34% in water. They were characterized using XRD, XPS, TEM and FTIR spectroscopy for structural analysis. A tentative mechanism explaining the origin of the NPs emission in the blue region is presented based on the distinctive features of their low temperature photoluminescence (PL), photoluminescence excitation (PLE) spectrum and time correlated single photon counting lifetime decay profiles. The outstanding PL QY and photostability of the NPs, together with their water dispersibility and biocompatibility, constitute a unique set of properties among existing silica NPs and enable the application of the NPs in various fields.
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