Preparation and characterization of Ag colloid monolayers
Preparation and characterization of Ag colloid monolayers
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DOI：
10.1021/la980138j
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发表时间：
1998-09-29
期刊：
影响因子：
3.9
通讯作者：
Natan, MJ
中科院分区：
文献类型：
--
作者：
Bright, RM;Musick, MD;Natan, MJ
采用紫外可见分光光度法、石英晶体微重力法和原子力显微镜研究了Ag胶体在有机硅烷功能化玻璃、碳和Au表面的自组装过程。银胶体制备柠檬酸盐还原和乙二胺四乙酸还原Ag+产生不同的沉积动力学，主要是由于颗粒浓度和单分散性的差异。测定了每种胶体的粘附概率和平衡常数。银胶体单层的表面增强拉曼散射（Sers）和电化学性能进行了比较，散装银。银胶体沉积在碳电极上提高了电子转移到[Ru（NH3）（6）]（3+）的非均相速率常数，但修饰电极仍低于体Ag获得的值。同样地，Ag胶体单层的SERS活性低于粗糙的块状Ag。讨论了颗粒多分散性对这些现象的影响。
The process of Ag colloid self-assembly onto organosilane-functionalized glass, carbon, and Au surfaces has been studied using W-visible spectrophotometry, quartz crystal microgravimetry, and atomic force microscopy. Ag colloids prepared by citrate reduction and by ethylenediaminetetraacetic acid reduction of Ag+ yield different deposition kinetics, primarily a result of differences in particle concentration and monodispersity. The sticking probabilities and equilibrium constants for each type of colloid were measured. Surface-enhanced Raman scattering (SERS) and electrochemical properties of Ag colloid monolayers were compared to bulk Ag. Deposition of Ag colloid onto carbon electrodes improves the heterogeneous rate constant for electron transfer to [Ru(NH3)(6)](3+), but the modified electrodes still fall short of values obtained for bulk Ag. Likewise, Ag colloid monolayers are less SERS-active than roughened bulk Ag. The effects of particles polydispersity on these phenomena are discussed.