Toward quantitatively fluorescent carbon-based "quantum'' dots
Toward quantitatively fluorescent carbon-based "quantum'' dots
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DOI：
10.1039/c0nr00962h
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发表时间：
2011-01-01
期刊：
影响因子：
6.7
通讯作者：
Sun, Ya-Ping
中科院分区：
文献类型：
--
作者：
Anilkumar, Parambath;Wang, Xin;Sun, Ya-Ping
碳基“量子”点（或“碳点”）通常被定义为具有明亮荧光的表面钝化的小碳纳米颗粒。显然，碳点中的碳颗粒表面钝化对其荧光性能至关重要。改善表面钝化的有效方法是用无机盐掺杂碳纳米粒子前体的表面，然后用有机分子进行典型的功能化。在这项工作中，我们通过纳米级半导体表面掺杂和有机功能化相结合，钝化小碳纳米粒子，再加上凝胶柱分级分离，以收获最具荧光性的碳点，其荧光发射量子产率高达 78%。讨论了与进一步提高碳点定量荧光性能相关的实验和机械问题。
Carbon-based "quantum'' dots (or "carbon dots'') are generally defined as surface-passivated small carbon nanoparticles that are brightly fluorescent. Apparently, the carbon particle surface passivation in carbon dots is critical to their fluorescence performance. An effective way to improve the surface passivation is to dope the surface of the precursor carbon nanoparticles with an inorganic salt, followed by the typical functionalization with organic molecules. In this work we passivated small carbon nanoparticles by a combination of the surface-doping with nanoscale semiconductors and the organic functionalization, coupled with gel column fractionation to harvest the most fluorescent carbon dots, which exhibited fluorescence emission quantum yields of up to 78%. Experimental and mechanistic issues relevant to potentially further improve the performance of carbon dots toward their being quantitatively fluorescent are discussed.