Cheng Huan, Wang Kun, Gao Renxian, Fu Shi-Ying, Wang Xiao-Ting, Lin Jia-Sheng, Liu Yingying, Sun Xuguang, Yang Zhilin, Duan Xidong, Zhang Yue-Jiao, Hu Jiawen, Li Jian-Feng
Hunan Key Laboratory of Two-Dimensional Materials, Advanced Catalytic Engineering Research Center of the Ministry of Education, and College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, College of Energy, College of Physical Science and Technology, and College of Materials, Xiamen University, Xiamen 361005, China.
Nano Lett. 2024 Dec 25;24(51):16374-16382. doi: 10.1021/acs.nanolett.4c04951. Epub 2024 Dec 13.
Hot spots can generate intense local electromagnetic (EM) fields, thereby boosting diverse innovative applications. However, these applications may face challenges due to their subtle structural changes that can significantly impact their EM field strength. Herein, we report a large-scale synthesis of monodisperse, highly spherical, single crystalline (SC) Au nanospheres (Au NSs) with tunable sizes ranging from 38 to 92 nm for constructing uniform and reproducible hot spots with a nanosphere-on-mirror (NSoM) configuration. Surface-enhanced Raman scattering tests reveal that single NSoM hot spots generate homogeneous EM fields with intensity variation of <4.0% due to their identical "point-to-mirror" configuration. Moreover, the SC nature of the Au NSs can further increase the EM field by 9% because of their higher quality factor, resulting in less energy dissipation in the plasmon. Therefore, these Au NSs may serve as ideal building blocks for the construction of hot spots with homogeneous EM fields.
热点能够产生强烈的局部电磁场，从而推动各种创新应用。然而，这些应用可能会面临挑战，因为其细微的结构变化会显著影响其电磁场强度。在此，我们报告了一种大规模合成单分散、高度球形、单晶（SC）金纳米球（Au NSs）的方法，其尺寸可在38至92纳米范围内调节，用于构建具有镜上纳米球（NSoM）构型的均匀且可重复的热点。表面增强拉曼散射测试表明，单个NSoM热点由于其相同的“点到镜”构型，产生强度变化<4.0%的均匀电磁场。此外，Au NSs的单晶性质因其更高的品质因数可使电磁场进一步增强9%，从而减少等离子体中的能量耗散。因此，这些Au NSs可作为构建具有均匀电磁场热点的理想构建单元。
