基于蝶翅鳞片三维结构的Au/SnO_2纳米复合材料制备及其表面增强拉曼散射性能研究

Fabrication of Au/SnO_2 Nanocomposites Based on 3D Structures of Butterfly Wing Scales and Research on Its SERS Effects

利用巴黎翠凤蝶前翅翅鳞片作为模板,通过前驱体浸泡后烧结的方法制备出具有原始蝶翅鳞片准周期三维结构的SnO2(金红石相),并采用化学沉积的方法在已制备的SnO2上沉积Au纳米颗粒,合成出Au/SnO2纳米复合材料.通过SEM、XRD以及TEM等表征方法检测并分析该材料形貌结构和成分组成.采用罗丹明6G(R6G)作为分析物,测试该材料的表面增强拉曼散射光谱.通过材料形貌结构图及UV-Vis漫反射光谱谱图,分析该基底的表面增强拉曼散射机理.该基底所具有的三维结构为拉曼信号增强提供大量"热点",而基底材料中SnO2和Au纳米颗粒为拉曼增强效应提供协同作用.良好的拉曼性能以及较低的制备成本表明,该新型表面增强拉曼散射基底具有一定的应用前景.

Scales from fore wings of Papilio paris was used as templates, by ringing the original fore wings in the precursor and treatment by calcinations, SnO2 （rutile） which inherited the 3D quasi-periodic structures of original wing scale was fabricated. After that, Au nanoparticles were incorporated in the system of as-prepared SnOz to form the Au/SnO2 nanocomposites. XRD, SEM and TEM were carried out to investigate the morphologies, structures and elemental composition. For measuring Surface-enhanced Raman Scattering （SERS） effects of the Au/SnO2 substrate, R6G was used as analyte molecules. By analyzing morphologies of this nanocomposites and UV-Vis DRS spectra of different substrates, mechanisms of SERS effects for this Au/SnO2 nanocomposites substrate were analyzed. The three-dimensional nanostructures of the substrate provide large quantities of Raman ＇hot spots＇, meanwhile, the SnO2 and Au make synergetic contribution to the enhancement effects. The satisfying SERS properties combined with low synthesis costs show the prospective application possibilities of this novel SERS substrate.