Plasma-Assisted and Solvent-Free Ultra-Fast Synthesis of Gold and Gold Oxide Ultra-Small Nanoparticles and its use as Multi-Sensing Platforms.
Por:
Sans J, Colombi S, Arnau M, Fontana-Escartín A, Resina L, García-Torres JM and Alemán C
Publicada:
1 dic 2025
Ahead of Print:
28 oct 2025
Resumen:
In this work, a plasma-assisted and solvent-free synthesis of gold (Au) and gold oxide (Au(2)O(3)) nanoparticles (NPs) is explored. Accordingly, only the precursor (i.e., HAuCl(4) powder) is exposed to the N(2):O(2) plasma gas mixtures, selected to promote its reduction to Au (HAuCl(4)-to-Au(0)) and/or favor its further oxidation to Au(2)O(3). As a result, the production of highly crystalline spherical Au ultra-small NPs (USNPs) of 2.7 ± 0.7 nm and Au(2)O(3) edged pyramidal-like NPs of 18 ± 5 nm is obtained in very short times (i.e., 10 s(-1) min), showing excellent stability without the need to add any ligands. To investigate the potential features of the synthesized particles, they are loaded into alginate hydrogels and tested as multi-detection sensor platforms of H(2)O(2) and NADH in front of several interferents. Although both samples present excellent electrochemical sensing activity (as compared to Au NPs synthesized through the Turkevich method), Au(2)O(3) NPs stand out for its high analytical sensibility toward H(2)O(2) (153.1 and 16.8 µA mm(-1) cm(-2) for single and multiplexing detection, simultaneously); and capacity to measure NADH in real human urine and low detection limits produced by Escherichia coli (7.5 × 10(3) CFU mL(-1)). Herein, a green, easy, and fast method is proposed to produce stable Au USNPs and Au(2)O(3) NPs, showing great potential for the catalytic and biomedical fields.
Filiaciones:
Sans J:
Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, Barcelona, 08019, Spain
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, Barcelona, 08028, Spain
Colombi S:
Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, Barcelona, 08019, Spain
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
Arnau M:
Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, Barcelona, 08019, Spain
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
Fontana-Escartín A:
Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, Barcelona, 08019, Spain
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
Resina L:
Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, Barcelona, 08019, Spain
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
García-Torres JM:
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
Biomaterials, Biomechanics and Tissue Engineering Group, Department of Materials Science and Engineering, Escola d'Enginyeria Barcelona Est (EEBE) and Institute for Research and Innovation in Health (IRIS), Universitat Politècnica de Catalunya (UPC), Barcelona, 08019, Spain
CIBER en Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, Zaragoza, 50018, Spain
Alemán C:
Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Ed. I2, Barcelona, 08019, Spain
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/ Eduard Maristany, 10-14, Barcelona, 08019, Spain
Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Baldiri Reixac 10-12, Barcelona, 08028, Spain
Open Access
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