Plasmon-enhanced photoluminescence of carbon dots–silica hybrid mesoporous spheres
Plasmon-enhanced photoluminescence of carbon dots–silica hybrid mesoporous spheres
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DOI：
10.1039/c4tc02599g
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发表时间：
2015-03
影响因子：
6.4
通讯作者：
Yun Liu;Chun‐yan Liu;Zhi‐ying Zhang;Wendong Yang;Shi-dong Nie
中科院分区：
文献类型：
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作者：
Yun Liu;Chun‐yan Liu;Zhi‐ying Zhang;Wendong Yang;Shi-dong Nie
银增强的荧光碳点-二氧化硅杂化介孔球（Ag-CDSiMs）具有高表面积（>300 m2 g-1），已经通过一种简单的方法制备。掺入浓度为0.34原子%的银纳米颗粒（NPs）显著改善了这些球体的光致发光（PL）。增强因子（EF）对激发波长非常敏感，当激发波长为370 nm时，EF最大（约3.4倍）。XPS测量结果表明，掺入银纳米粒子导致O结合能的增加，表明它们选择性地连接到SiO2域使用Ag-O键。在这种情况下，碳量子点和银纳米颗粒之间的电子转移变得不可能，这诱导了局部电磁场的增强以及银纳米颗粒的SPR吸收和Ag-CDSiMs的发射之间的等离子体激元耦合效应，沿着共价键合到介孔SiO2的碳量子点的发光的增强。
Ag-enhanced fluorescent carbon dot–silica hybrid mesoporous spheres (Ag-CDSiMs) with high surface areas (>300 m2 g−1) have been prepared by a facile process. The incorporation of the silver nanoparticles (NPs) at a concentration of 0.34 at% considerably improved the photoluminescence (PL) of these spheres. The enhancement factor (EF) was very sensitive to the excitation wavelength, and the largest EF (∼3.4-fold) appeared when applying an excitation wavelength of 370 nm. XPS measurements revealed that the incorporation of silver NPs led to an increase of the O binding energy, indicating that they selectively linked to the SiO2 domain using Ag–O bonds. In this case, the electron transfer between carbon dots and the Ag NPs became impossible, which induced an enhancement of the local electromagnetic field and a plasmon coupling effect between the SPR absorption of Ag NPs and emission of Ag-CDSiMs, along with enhancement of the luminescence of the carbon dots covalently bonded to the mesoporous SiO2.