【摘要】 采用一种结合化学组装和电化学沉积制备均匀而且具有强SERS基底的方法,研究了沉积电位对组装在ITO表面的金纳米粒子形貌的影响,发现在-0.04 V下沉积5 min可以得到形貌均匀的纳米粒子.利用现场电化学紫外-可见吸收光谱来监控电化学沉积过程,发现沉积一定时间后,紫外-可见吸收谱在600~700 nm区间出现新峰,表明粒子间发生了有效的电磁场耦合.对制备的基底进行拉曼成像,结果表明,基底的均匀性很好,最强点与最弱点的d信号差小于20%,符合商品化基底的要求.更多还原

【Abstract】 We reported a method to prepare SERS substrates with a high and uniform SERS activity by combining chemical assembly and electrochemical deposition methods.We systematically investigated the effect of the electrode potential on the surface morphology of the Au nanoparticles on the ITO surface.It is found that Au nanoparticles with very uniform structure and proper electromagnetic coupling can be obtained by electrodeposition at-0.04 V(vs.SCE) for 5 min.In situ electrochemical UV-Vis absorption spectroscopy was used to monitor the deposition process by measuring the absorption spectra.A new peak between 600 and 700 nm was observed in the UV spectra during the electrochemical deposition process,which can be used as a measurement of whether and how the electromagnetic field of nanoparticles couples.SERS mapping was performed to demonstrate that the substrate was very uniform with a signal deviation less than 20%,meeting the standard for commercial SERS substrates.更多还原