Effect of hydrothermal temperature on the antibacterial and photocatalytic activity of WO 3 decorated with silver nanopa
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ORIGINAL PAPER: NANO-STRUCTURED MATERIALS (PARTICLES, FIBERS, COLLOIDS, COMPOSITES, ETC.)
Effect of hydrothermal temperature on the antibacterial and photocatalytic activity of WO3 decorated with silver nanoparticles R. A. Capeli1 T. Belmonte2 J. Caierão3 C. J. Dalmaschio4 S. R. Teixeira5 V. R. Mastelaro6 A. J. Chiquito7 M. D. Teodoro8 J. F. M. Domenegueti8 E. Longo9 L. G. Trindade1 F. M. Pontes1 ●
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Received: 18 May 2020 / Accepted: 21 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We studied the catalytic and antimicrobial properties of hierarchical architecture of WO3.Ag synthesized at 100, 150, and 200 °C by a very simple and reliable hydrothermal technique. The investigation carried out by XRD showed the amorphous nature of sample grown at 100 °C, while those at 150 and 200 °C crystalline nature of 3D WO3.Ag was confirmed. From FESEM and HRTEM results, it was evident that the silver nanoparticles grew in a 3D WO3.Ag host matrix. The average diameter of Ag nanoparticles by HRTEM was around 5–15 nm. Photocatalytic activities of as-prepared samples were evaluated by the degradation of rhodamine B (RhB). Samples prepared at 150 and 200 °C showed higher activity in comparison to sample prepared at 100 °C. This can be mainly attributed to the suppression of traps states and electron/hole pairs recombination as highlighted by the photoluminescence results. The as-synthetized samples showed promising antimicrobial features against various bacterial strains. The 100 °C WO3.Ag nanospheres exhibited the highest antibacterial activity, with very low minimum inibitory concentration (MIC) values (4.0–8.0 μg/ml) when compared with 150 and 200 °C samples.
Supplementary information The online version of this article (https:// doi.org/10.1007/s10971-020-05433-6) contains supplementary material, which is available to authorized users. * F. M. Pontes [email protected] 1
Department of Chemistry, Universidade Estadual Paulista— Unesp, P.O. Box 473, 17033-360 Bauru, São Paulo, Brazil
2
Pharmaceutical Science Post-Graduation Program, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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Faculty of Pharmacy, Department of Analysis, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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Department of Chemistry, Universidade Federal do Espírito Santo—UFES, 29075-910 Vitória, Espírito Santo, Brazil
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Faculdade de Ciências e Tecnologia—FCT, Departament of
physics, Universidade Estadual Paulista, Rua Roberto Simonsen, 305, 19060-900 Presidente Prudente, São Paulo, Brasil 6
Physics Institute of São Carlos (IFSC), University of São Paulo, São Carlos, São Paulo, Brazil
7
Department of Physics, NanO LaB, Universidade Federal de São Carlos, Via Washington Luiz, Km 235, P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
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Grupo de Nanoestruturas Semicondutoras—Department of Physics, Universidade Federal de São Carlos, Via Washington Luiz, Km 235, P.O. Box 676
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