(廣東工業(yè)大學(xué) 輕工化工學(xué)院，廣州 510006)
摘 要: 采用電子掃描顯微鏡(SEM)表征過(guò)氧化氫(H2O2)蝕刻的銀納米線表面形貌，采用紫外-可見(jiàn)(UV-vis)吸收光譜、熒光光譜以及拉曼光譜研究蝕刻后銀納米線的表面等離激元特性。結(jié)果表明：H2O2可有效蝕刻銀納米線表面形貌，與未蝕刻的銀納米線相比，蝕刻后的銀納米線平均直徑減小，表面形成納米凹槽以及立方狀的銀納米粒子，銀納米線表面等離激元共振吸收峰強(qiáng)度增大，并呈現(xiàn)寬化。由于蝕刻后的銀納米線光電耦合增強(qiáng)，導(dǎo)致表面的電磁場(chǎng)強(qiáng)度增大，對(duì)羅丹明B(RB)探針?lè)肿拥臒晒廨椛湓鰪?qiáng)16.8倍，對(duì)RB探針?lè)肿拥睦⑸湫盘?hào)增強(qiáng)約6.2×105倍。這對(duì)于納米金屬表面增強(qiáng)光譜具有積極的應(yīng)用意義。
關(guān)鍵字: 銀納米線；蝕刻；表面等離激元；電磁場(chǎng)；表面增強(qiáng)光譜
（Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China）
Abstract:Using H2O2 acid, the surface of silver nanowires (AgNWs) was etched after being prepared by chemical method, and the morphologies of smooth AgNWs and etched AgNWs were both characterized by scanning electron microscopy (SEM). Employing UV-vis spectrum, Fluorescent spectrum and Raman spectrum, the surface plasmons of smooth AgNWs and etched AgNWs were both analyzed. The SEM results show that the mean diameters of AgNWs are significantly reduced after being etched, and more nanogaps and nanocubes form on the surfaces of AgNWs that are etched. The UV-vis spectrum shows that the surface-plasmon resonance(SPR) peak of AgNWs is broaden after the nanowires are etched, which result is due to the stronger coupling of surface plasmon, and Fluorescent spectrum and Raman spectrum of RB are both enhanced since the stronger electromagnetic field effect around etched AgNWs. These results may be significant for the application of surface enhanced spectrum.
Key words: silver nanowire; etching; surface plasmon; electromagnetic field; surface enhanced spectrum
