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Correlation notice on the electrochemical dealloying and antibacterial properties of gold–silver alloy nanoparticles

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Abstract

Galvanic replacement reaction was used in the synthesis of bimetallic gold–silver alloy nanoparticles (Au–Ag NPs), where pre-synthesized Ag nanoparticles-polyvinylpyrrolidone (AgNPs-PVP) were used to reduce the aryldiazonium tetrachloroaurate(III) salt in water. TEM images and EDS elemental analysis showed the formation of spherical Au–Ag NPs with sizes of 12.8 ± 4.9 nm and 25.6 ± 14.4 nm for corresponding Au–Ag ratios and termed as Au0.91Ag0.09 and Au0.79Ag0.21, respectively, with different concentrations of the gold precursor. The hydrodynamic sizes measured using dynamic light scattering are 46.4 nm and 74.8 nm with corresponding zeta potentials of − 44.56 and − 25.09 mV in water, for Au0.91Ag0.09 and Au0.79Ag0.21 respectively. Oxidative leachability of Ag ion studies from the starting AgNPs-PVP in 1 M NaCl showed a significant decrease in the plasmon peak after 8 h, indicating the complete dissolution of Ag ions, however, there is enhanced oxidation resistivity of Ag from Au–Ag NPs even after 24 h. Electrochemical studies on glassy carbon electrodes displayed a low oxidation peak in aqueous solutions of 20 mM KCl at 0.16 V and KNO3 at 0.33 V vs. saturated calomel electrode (SCE). We studied the antibacterial activity of Au–Ag alloy nanoparticles against gram-positive Staphylococcus aureus, Staphylococcus epidermidis, Enterococcus faecalis, and gram-negative Escherichia coli, Salmonella typhimurium, and Pseudomonas aeruginosa. Our findings demonstrated superior antibacterial activity of Au–Ag NPs compared with AgNPs-PVP. Moreover, the nanoparticles inhibited the S. epidermidis biofilm formation.

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Acknowledgements

AAM acknowledges the University of Sharjah support of competitive grants 160-2142-029-P and 150-2142-017-P. CH acknowledges the support of the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2021R1A4A1032746) and (No. 2021R1A2C1093183).

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Authors and Affiliations

  1. Department of Chemistry, University of Sharjah, Sharjah, 27272, United Arab Emirates

    Javad B. M. Parambath, Seema Panicker & Ahmed A. Mohamed

  2. Department of Applied Biology, University of Sharjah, Sharjah, 27272, United Arab Emirates

    Islam M. Ahmady

  3. Program in Environmental & Polymer Engineering, Graduate School, INHA University, Incheon, 22212, Republic of Korea

    Aebin Sin & Changseok Han

  4. Department of Environmental Engineering, INHA University, Incheon, 22212, Republic of Korea

    Changseok Han

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  1. Javad B. M. Parambath
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Parambath, J.B.M., Ahmady, I.M., Panicker, S. et al. Correlation notice on the electrochemical dealloying and antibacterial properties of gold–silver alloy nanoparticles. Biometals 35, 1307–1323 (2022). https://doi.org/10.1007/s10534-022-00446-w

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