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Research Article | Open Access

Operando electrochemical SERS monitors nanoparticle reactions by capping agent fingerprints

Kevin Wonner1,§Steffen Murke2,§Serena R. Alfarano2Pouya Hosseini1Martina Havenith2( )Kristina Tschulik1( )
Chair of Analytical Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Bochum 44801, Germany
Chair of Physical Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Bochum 44801, Germany

§ Kevin Wonner and Steffen Murke contributed equally to this work.

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Graphical Abstract

Capping agent effects on the electrochemical oxidation of silver nanoparticles (NPs) are studied in halide electrolyte solutions by coupled electrochemical surface-enhanced Raman spectroscopy (SERS). The reaction is directly monitored by the current response and the simultaneous Raman signal.

Abstract

Nanomaterials are frequently employed in daily life goods, including health, textile, and food industry. A comprehensive picture is lacking on the role of the capping agents, added ligand molecules, in case of nanoparticle reactions and degradation in aqueous solutions, like surface waters or biofluids. Here, we aim to elucidate the capping agent influence on nanoparticle reactivity probing two commonly employed capping agents citrate and polyvinylpyrrolidone (PVP). Their influence on silver nanoparticle (AgNP) transformation is studied, which is particularly important due to its application as an antimicrobial agent. We induce oxidation and reduction processes of AgNPs in halide solutions and we monitor the associated transformations of particles and capping agents by spectro-electrochemical surface-enhanced Raman spectroscopy (SERS). Raman bands of the capping agents are used here to track chemical changes of the nanoparticles under operando conditions. The sparingly soluble and non-plasmon active silver salts (AgBr and AgCl) are formed under potential bias. In addition, we spectroscopically observe plasmon-mediated structural changes of citrate to cis- or trans-aconitate, while PVP is unaltered. The different behavior of the capping agents implies a change in the physical properties on the surface of AgNPs, in particular with respect to the surface accessibility. Moreover, we showcase that reactions of the capping agents induced by different external stimuli, such as applied bias or laser irradiation, can be assessed. Our results demonstrate how SERS of capping agents can be exploited to operando track nanoparticle conversions in liquid media. This approach is envisaged to provide a more comprehensive understanding of nanoparticle fates in complex liquid environments and varied redox conditions.

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Nano Research
Pages 4517-4524
Cite this article:
Wonner K, Murke S, Alfarano SR, et al. Operando electrochemical SERS monitors nanoparticle reactions by capping agent fingerprints. Nano Research, 2022, 15(5): 4517-4524. https://doi.org/10.1007/s12274-021-3999-2
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Received: 14 July 2021
Revised: 04 October 2021
Accepted: 24 October 2021
Published: 27 January 2022
© The Author(s) 2021

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