纳米金汞核-壳粒子的电化学制备及其光谱性质

Electrochemical Preparation and Spectral Properties of Au-Hg Core-shell Nanoparticles

在聚乙烯吡啶修饰导电玻璃电极表面进行了金纳米粒子的二维单层结构组装,通过电沉积方法在金粒子表面制备了纳米汞壳层.研究结果表明,汞壳层的形成导致了内部金粒子表面等离子体共振的谱峰红移和强度衰减.吸附于汞壳表面的结晶紫分子因可承受被金核增强的电磁场,而使其拉曼散射得到极大的增强.

Gold nanopartieles were assembled on the polyvinylpyridine modified ITO electrode to form a particle monolayer. Mercury nanoshell on the surface of the gold nanoparticles was obtained by electrochemical deposition. The formation of the mercury nanoshell resulted in a red shift and damping of the surface plasmon resonance of the inner gold nanoparticles. Molecules adsorbed on the mercury nanoshell can still experience the enhanced electric field from the gold core, as a result, the Raman scattering of the adsorbed molecules can be greatly enhanced.