Opt Lett. 2018 May 15;43(10):2244-2247. doi: 10.1364/OL.43.002244.
Surface-enhanced Raman scattering (SERS) of a single ZnO nanorod (NR) is demonstrated by coating with Ag nanoparticles (NPs). An enhancement factor of 1.2×10 and 4.4×10 has been obtained for E (high) mode (437 cm) and A (TO) mode (378 cm), respectively. Electron paramagnetic resonance measurements reveal an unintentional donor state in ZnO NRs. The enhancement of deep-level emission and micro-absorption mapping of a single ZnO NR further confirms the presence of the donor state. The SERS is believed to result from the charge transfer between ZnO NRs and Ag NPs, which can be enhanced by the empty donor state in ZnO. Finally, single ZnO NRs coated with Ag can be used as good SERS substrates for small molecule detection. This Letter highlights the interaction between point defects and the SERS effect down to a single semiconductor NR.
通过涂覆银纳米粒子（NPs），实现了单个 ZnO 纳米棒（NR）的表面增强拉曼散射（SERS）。分别获得了 E（高）模式（437 cm）和 A（TO）模式（378 cm）的增强因子 1.2×10 和 4.4×10。电子顺磁共振测量揭示了 ZnO NR 中存在非故意施主态。单个 ZnO NR 的深能级发射增强和微观吸收映射进一步证实了施主态的存在。SERS 被认为是由 ZnO NRs 和 Ag NPs 之间的电荷转移引起的，而 ZnO 中的空施主态可以增强这种电荷转移。最后，涂覆有 Ag 的单个 ZnO NR 可用作小分子检测的良好 SERS 基底。本信强调了点缺陷与 SERS 效应之间的相互作用，直至单个半导体 NR。
