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Influence of various chloride ion concentrations on silver nanoparticle transformations and effectiveness in surface enhanced Raman scattering for different excitation wavelengths

机译：各种氯离子浓度对不同激发波长的银纳米粒子转变和表面增强拉曼散射有效性的影响

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The effect of six various chloride ion concentrations (25, 50, 100, 200, 400, and 800 mM) on time-dependence and surface enhanced Raman scattering (SERS) signal intensity was investigated for silver nanoparticles (similar to 28 nm) with a high monodispersity and long time stability. The experiments were performed using three lasers with excitation wavelengths in the visible region (532 nm, 633 nm, 780 nm). Adenine was used as a model analyte. The treatment procedure, when the various sodium chloride solutions added to silver nanoparticles, led to an enhancement in the Raman signal at all studied concentration levels of sodium chloride. Nevertheless, low-concentration chloride ions differently influenced the time course of enhancement efficiency contrary to high-concentration chloride ions. The final concentration of chloride ions equal to 25 mM did not have any pronounced influence on the silver particle sizes and morphologies. The final concentration of chloride ions varying from 50 to 200 mM led to the etching and coalescence of silver nanoparticles. Higher concentrations of chlorides (400 mM) caused re-crystallization of primary silver nanoparticles to one order larger crystallites (400 nm). From the point of view of SERS, the time dependent profiles of Raman signal enhancement differ only slightly for all the used final concentrations of chloride ions when using excitation at 532 nm. On the contrary, for excitation wavelengths 633 nm and 780 nm, the time dependent profiles of Raman signal enhancement were very different when using above mentioned six various final concentrations of chloride ions.
机译：对于银纳米颗粒（类似于28 nm），研究了六种不同氯离子浓度（25、50、100、200、400和800 mM）对时间依赖性和表面增强拉曼散射（SERS）信号强度的影响。高单分散性和长时间稳定性。使用激发波长在可见光区域（532 nm，633 nm，780 nm）的三台激光器进行实验。腺嘌呤用作模型分析物。当将各种氯化钠溶液添加到银纳米颗粒中时，处理程序会导致在所有研究的氯化钠浓度水平下拉曼信号增强。然而，与高浓度氯离子相反，低浓度氯离子对提高效率的时间过程有不同的影响。氯离子的最终浓度等于25 mM，对银的粒径和形态没有任何明显的影响。氯离子的最终浓度从50到200 mM不等，导致了银纳米颗粒的蚀刻和聚结。较高浓度的氯化物（400 mM）导致初级银纳米颗粒重结晶为一个较大的微晶（400 nm）。从SERS的角度来看，当使用532 nm激发时，对于所有使用的最终氯离子浓度，拉曼信号增强的随时间变化的曲线仅略有不同。相反，对于激发波长为633 nm和780 nm，当使用上述六种最终浓度的氯离子时，拉曼信号增强的时间相关曲线非常不同。

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