以DDAB为模板的银纳米粒子多层膜制备及其表面增强拉曼效应

Fabrication of Silver Nanoparticle Multilayer Films by Using DDAB Films as a Template and Their Application to Surface-enhanced Raman Scattering

通过离子交换和静电相互作用,将银纳米粒子引入双十二烷基二甲基溴化铵(DDAB)模板中,获得了有序的银纳米粒子多层膜.用紫外-可见光谱(UV-V is)、循环伏安(CV)和原子力显微镜(AFM)对其进行了表征,并用小角X射线衍射(XRD)研究了DDAB模板和银纳米粒子多层膜的有序性结构.以4-巯基吡啶(4-MPY)为探针分子研究了银纳米粒子多层膜在表面增强拉曼(SERS)方面的应用,结果表明,4-MPY吸附在银纳米粒子多层膜上呈现很强的SERS信号,说明该多层膜可以用作高活性的SERS基底.

Highly ordered silver nanoparticle muhilayer films were achieved conveniently by using didodecyldimethylammonium bromide（DDAB） films as a template. The obtained thin films were characterized by UV-Vis spectroscopy, cyclic vohammerty （CV） and atomic force microscopy （AFM） in detail. The well-ordered superlattice structure of the DDAB template and the silver nanoparticle muhilayer films were also identified by X-ray diffraction（XRD）. The application of the as-prepared silver nanoparticle muhilayer films in surface-enhanced Raman spectroscopy （SERS） was investigated by using 4-mercaptopyridine （4-MPY） as the probe molecules. It was found that the silver nanoparticle muhilayer films exhibied a remarkable enhancement ability, and can be used as SERS substrates.