Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, P. R. China.
The Institute for Advanced Studies, Wuhan University, Wuhan 430072, P. R. China.
Sci Rep. 2017 Mar 21;7:44806. doi: 10.1038/srep44806.
We report a plasmon-assisted growth of metal and semiconductor onto the tips of Ag nanotriangles (AgNTs) under light irradiation. The site-selective growth of Ag onto AgNTs are firstly demonstrated on the copper grids and amine-coated glass slides. As the irradiation time increases, microscopic images indicate that AgNTs gradually touch with each other and finally "weld" tip-to-tip together into the branched chains. Meanwhile, the redshift of plasmon band is observed in the extinction spectra, which agrees well the growth at the tips of AgNTs and the decrease of the gaps between the adjacent nanotriangles. We also synthesize AgNT-CuO nanocomposites by using a photochemical method and find that the CuO nanoparticles preferably grow on the tips of AgNTs. The site-selective growth of Ag and CuO is interpreted by the local field concentration at the tips of AgNTs induced by surface plasmon resonance under light excitation.
我们报告了在光照射下，金属和半导体在 Ag 纳米三角体（AgNTs）的尖端上的等离子体辅助生长。AgNTs 上的 Ag 的选择性生长首先在铜网上和胺涂覆的载玻片上得到了证明。随着辐照时间的增加，微观图像表明 AgNTs 逐渐相互接触，最终“焊接”在一起，形成了分支链。同时，在消光谱中观察到等离子体带的红移，这与 AgNTs 尖端的生长以及相邻纳米三角体之间的间隙减小相符。我们还通过光化学方法合成了 AgNT-CuO 纳米复合材料，并发现 CuO 纳米颗粒优先在 AgNTs 的尖端生长。光激发下表面等离激元共振诱导的 AgNTs 尖端的局域场浓度解释了 Ag 和 CuO 的选择性生长。
