Chandra Sourov, Beaune Grégory, Shirahata Naoto, Winnik Françoise M
WPI International Centre for Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan.
J Mater Chem B. 2017 Feb 21;5(7):1363-1370. doi: 10.1039/c6tb02813f. Epub 2016 Dec 22.
We report a one-pot synthesis of water dispersible fluorescent silica nanoparticles (NPs) functionalized with terminal amine groups, starting from silicon tetrabromide (SiBr) 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.
我们报道了一种从四溴化硅（SiBr）和氨丙基三乙氧基硅烷（APTES）出发，一锅法合成末端胺基功能化的水分散性荧光二氧化硅纳米颗粒（NPs）的方法。这些纳米颗粒直径在1到2纳米之间，在水中呈现强烈的蓝色发射，量子产率（QY）约为34%。使用X射线衍射（XRD）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）和傅里叶变换红外光谱（FTIR）对其进行结构分析表征。基于纳米颗粒低温光致发光（PL）、光致发光激发（PLE）光谱和时间相关单光子计数寿命衰减曲线的独特特征，提出了一种解释纳米颗粒在蓝色区域发射起源的初步机制。纳米颗粒出色的PL量子产率和光稳定性，以及它们的水分散性和生物相容性，构成了现有二氧化硅纳米颗粒中一组独特的性质，并使这些纳米颗粒能够应用于各个领域。
