Hydrophilic Cu2-xSe/reduced graphene oxide nanocomposites with tunable plasmonic properties and their applications in cellular dark-field microscopic imaging
Hydrophilic Cu2-xSe/reduced graphene oxide nanocomposites with tunable plasmonic properties and their applications in cellular dark-field microscopic imaging
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具有可调等离子体特性的亲水性 Cu2-xSe/还原氧化石墨烯纳米复合材料及其在细胞暗场显微成像中的应用
DOI：
10.1039/c4tb01099j
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发表时间：
2014
影响因子：
7
通讯作者：
Huang Cheng Zhi
中科院分区：
文献类型：
--
作者：
Li Wen Long;Lie Shao Qing;Du Yu Qing;Wan Xiao Yan;Wang Ting Ting;Wang Jian;Huang Cheng Zhi
开发了一种简便的水相化学方法，用于在室温下一锅合成重掺杂半导体纳米颗粒（Cu 2 −xSe NPs）和还原氧化石墨烯（rGO）的纳米复合材料，其中GO的还原和Cu 2 −xSe NPs在rGO片上的原位生长同时发生。所制备的Cu 2 −xSe/rGO纳米复合材料表现出定义明确的近红外（NIR）局域表面等离子体共振（LSPR），这是由自由载流子（空穴）引起的，并且可以通过改变反应时间从1360 nm调谐到1050 nm，这是由于Cu 2 −xSe NPs价带中自由载流子密度的增加。这种方法不仅提供了一种有效的策略来合成具有强且可调的近红外吸收的自掺杂Cu 2 −xSe/rGO纳米复合材料，而且还开发了具有良好生物相容性的新型光散射纳米探针以及用于体外细胞暗场显微成像（iDFM）的独特光学特性。
A facile aqueous chemical approach is developed for one-pot synthesis of the nanocomposites of heavily doped semiconductor nanoparticles (Cu2−xSe NPs) and reduced graphene oxide (rGO) at room temperature, wherein the reduction of GO and the in situ growth of Cu2−xSe NPs on rGO sheets occur simultaneously. The as-prepared Cu2−xSe/rGO nanocomposites exhibit a well-defined near-infrared (NIR) localized surface plasmon resonance (LSPR), which arises from free carriers (holes) and could be tuned from 1360 to 1050 nm by varying the reaction time, owing to the increase of the free carrier density in the valence band of Cu2−xSe NPs. This approach not only offers an efficient strategy to synthesize the self-doped Cu2−xSe/rGO nanocomposites with strong and tunable NIR absorption, but also develops new light scattering nanoprobes with good biocompatibility as well as unique optical properties for in vitro cellular dark-field microscopic imaging (iDFM).