Voltammetric Study of the Influence of Various Phosphate Anions on Silver Nanoparticle Oxidation

ChemistryOpen

Dr. Daria V. Navolotskaya¹  Her Shuang Toh²  Dr. Christopher Batchelor&ndashMcAuley² 

[1] Saint Petersburg State University, Saint Petersburg, Russia;Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, UK

关键词: electrochemistry;    ion–silver interactions;    nanoparticles;    phosphate;    silver;   

DOI  :  10.1002/open.201500100

来源: Wiley

【 摘 要 】

Abstract

The antibacterial properties of silver are strongly controlled by the redox couple of silver/silver(I). This work reports the influence of phosphate anions on silver nanoparticle oxidation, which is important given the abundance of phosphate species in biological systems. The three different species of anions were found to have a varying degree of influence on silver oxidation with the order PO₄³⁻>HPO₄²⁻>H₂PO₄⁻. It was found that in the presence of phosphate anions, the silver oxidation potential shifts to a less positive value, which indicated the increasing ease of the oxidation reaction of silver. Given that the interplay between silver and its cation is crucial to its antibacterial properties and significant concentrations of the HPO₄²⁻ anion are present at biological pH (near neutral), it is essential that the influence of the dibasic anion (HPO₄²⁻) on silver oxidation dynamics be considered for biological systems.

【 授权许可】

CC BY-NC-ND   
© 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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