State Key Laboratory of Optoelectronic Materials and Technology, Sun Yat-sen University, Guangzhou 510275, China.
School of Metallurgy Engineering, Central South University, Changsha 41008, China.
Nanoscale Res Lett. 2014 May 14;9(1):237. doi: 10.1186/1556-276X-9-237. eCollection 2014.
Au and Ag hybrid hexagonal nanodisks were synthesized on ZnO nanorods' (0002) surface via a new two-step deposition-annealing method. The structural, compositional, as well as optical investigations were carried out systematically to find out the nanodisks' formation mechanism and optical enhancement effect. It was shown that the core-shell Au/Ag nanodisk can be formed under rapid annealing temperature of 500°C, while Au/Ag alloy nanodisks are formed if higher temperatures (>550°C) are applied. The optical effect from these nanodisks was studied through photoluminescence and absorption spectroscopy. It was found that the carrier-plasmon coupling together and carrier transfer between metal and ZnO contribute to the emission enhancement. Furthermore, the results suggest that the composition of nanodisk on the vicinity of metal/ZnO interface plays an important role in terms of the enhancement factors.
通过一种新的两步沉积-退火法，在 ZnO 纳米棒的（0002）表面上合成了 Au 和 Ag 混合的六方纳米盘。系统地进行了结构、组成和光学研究，以找出纳米盘的形成机制和光学增强效应。结果表明，在快速退火温度为 500°C 下可以形成核壳 Au/Ag 纳米盘，而如果施加更高的温度（>550°C）则会形成 Au/Ag 合金纳米盘。通过光致发光和吸收光谱研究了这些纳米盘的光学效应。结果发现，载流子-等离子体耦合以及金属和 ZnO 之间的载流子转移有助于发射增强。此外，结果表明，金属/ZnO 界面附近纳米盘的组成在增强因子方面起着重要作用。
