Abstract
CuOx, CoOy, and bimetallic CoCuOz nanoparticles with diameter between 54.6 and 111.4 nm were synthesized by sol-gel and eroded with Ar ions to identify and quantify the oxide structures formed in the particles. Oxidation was estimated by XPS calculating the respective atomic ratios, x=O/Cu, y=O/Co, and z=O/(CuCo). Five Cu oxides were identified in CuOx, in which x varied from 0.14 to 2.4 with an average of 1. In CoOy, 4 Co oxides were found, in which y varied from 1.6 to 3.8 with an average of 2.8. In CoCuOz, up to 6 Cu and Co oxides were identified, in which x varied from 0.87 to 1.67, y varied between 0.25 and 3.7, and z varied between 2.15 and 1.73. The atomic ratios indicated that oxidation reduced from the surface to the interior in CuOx and CoCuOz and slightly increased in CoOy. The ratios were compared with those indirectly obtained by XRD, finding that they were similar in CuOx with x≈1, but different in CoOy where y was smaller than that calculated with XPS. The method to identify and quantify oxidation applied here can also be used in other processes.
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Acknowledgements
Acknowledgment is given to CONACyT for the partial support to this work with the FC-152 project and for the doctor scholarship given to M.R. Mejía-Cuero and to PROMEP for the post-doctoral fellowships given to L.M. Gómez and M. González-Torres.
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Cruz, G.J., Colín-Orozco, E., Mejía-Cuero, R. et al. Oxidation profiles in Cu and Co oxide nanoparticles. J Nanopart Res 23, 257 (2021). https://doi.org/10.1007/s11051-021-05374-3
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DOI: https://doi.org/10.1007/s11051-021-05374-3