Abstract

The interaction of Ag⁺ ions existing on the surface of silver nanoparticles with complexing agents, such as ammonia, ammonium thiocyanate, and sodium thiosulfate, has been studied. Both the presence of complexing agents in the initial reaction mixture and their introduction into preliminarily synthesized sols of silver nanoparticles lead to a small shift of the absorption maximum toward long wavelengths and its considerable broadening. In both cases, there is a correlation of the absorption band width with the logarithm of formation constants of corresponding silver complexes. This can be evidence of analogous chemical processes that occur on the surface of nanoparticles. The surface complexation is of interest both for a fundamental understanding of the interaction nature and in the applied aspect for the determination of complexing agents in aqueous systems.

中文翻译：

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纳米粒子表面上的络合作用引起的银水溶胶的光谱性质变化

摘要

Ag ⁺的相互作用已经研究了具有络合剂（例如氨，硫氰酸铵和硫代硫酸钠）存在于银纳米颗粒表面的离子。初始反应混合物中络合剂的存在以及将其引入到银纳米颗粒的初步合成溶胶中均会导致最大吸收向长波长的微小移动，并导致相当大的展宽。在这两种情况下，吸收带宽与相应的银络合物的形成常数的对数相关。这可以证明在纳米颗粒表面上发生类似的化学过程。表面络合不仅对于相互作用性质的基本理解而且在确定水性体系中络合剂的应用方面都令人感兴趣。