Assessing the surface oxidation state of free-standing gold nanoparticles produced by laser ablation
De Anda Villa, Manuel; Gaudin, Jérôme; Amans, David; Boudjada, Fahima; Bozek, John; Evaristo Grisenti, Robert; Lamour, Emily; Laurens, Gaétan; Macé, Stéphane; Nicolas, Christophe; Papagiannouli, Irene; Patanen, Minna; Prigent, Christophe; Robert, Emmanuel; Steydli, Sébastien; Trassinelli, Martino; Vernhet, Dominique; Lévy, Anna (2019-08-27)
De Anda Villa, M., Gaudin, J., Amans, D., Boudjada, F., Bozek, J., Evaristo Grisenti, R., Lamour, E., Laurens, G., Macé, S., Nicolas, C., Papagiannouli, I., Patanen, M., Prigent, C., Robert, E., Steydli, S., Trassinelli, M., Vernhet, D., Lévy, A. (2019) Assessing the Surface Oxidation State of Free-Standing Gold Nanoparticles Produced by Laser Ablation. Langmuir, 35(36), 11859-11871. https://doi.org/10.1021/acs.langmuir.9b02159
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.langmuir.9b02159.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019092029101
Tiivistelmä
Abstract
The surface chemistry of gold nanoparticles produced by the pulsed laser ablation in liquids method is investigated by X-ray photoelectron spectroscopy (XPS). The presence of surface oxide expected on these systems is investigated using synchrotron radiation in conditions close to their original state in solvent but free from substrate or solvent effects which could affect the interpretation of spectroscopic observations. For that purpose we performed the experiment on a controlled free-standing nanoparticle beam produced by combination of an atomizer and an aerodynamic lens system. These results are compared with those obtained by the standard situation of deposited nanoparticles on silicon substrate. An accurate analysis based on Bayesian statistics concludes that the existence of oxide in the free-standing conditions cannot be solely confirmed by the recorded core-level 4f spectra. If present, our data indicate an upper limit of 2.15 ± 0.68% of oxide. However, a higher credence to the hypothesis of its existence is brought by the structureless valence profile of the free-standing beam. Moreover, the cross-comparison with the deposited nanoparticles case clearly evidences an important misleading substrate effect. Experiment with free-standing nanoparticles is then demonstrated to be the right way to further investigate oxidation states on Au nanoparticles.
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