Department of Physics, Southeast University, Nanjing 211189, People's Republic of China.
Nanotechnology. 2013 Jan 18;24(2):025201. doi: 10.1088/0957-4484/24/2/025201. Epub 2012 Dec 13.
We report giant fluorescence enhancement in SiC nanocrystals (NCs) embedded in a sodium dodecyl sulfonate dielectric medium by proximately contacted Ag nanoparticles. The enhancement in integrated fluorescence intensity reaches an astonishing 176-fold under 360 nm excitation (53.3-fold enhancement in emission maximum intensity). Finite-element simulation indicates that the strong resonant coupling between the excited SiC NCs and localized surface plasmons of the Ag nanoparticles plays a dominant role in determining fluorescence enhancement. In contrast, the absorption enhancement caused by light concentration around the Ag nanoparticles makes only a slight contribution to the overall enhancement. Our result opens the possibility of applications of these highly enhanced fluorescent SiC NCs in diverse areas such as sensing, optoelectronics and life sciences.
我们报告了在十二烷基磺酸钠介电介质中嵌入的 SiC 纳米晶体 (NCs) 通过近接触 Ag 纳米粒子实现的巨大荧光增强。在 360nm 激发下，集成荧光强度增强达到惊人的 176 倍（发射最大值强度增强 53.3 倍）。有限元模拟表明，激发的 SiC NCs 与 Ag 纳米粒子的局域表面等离激元之间的强共振耦合在确定荧光增强方面起着主导作用。相比之下，Ag 纳米粒子周围光的浓度引起的吸收增强对整体增强的贡献很小。我们的结果为这些高度增强的荧光 SiC NCs 在传感、光电和生命科学等多个领域的应用开辟了可能性。
