Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties
Electrochemical modification of the Ti surface to obtain TiO₂ nanotubes (NT-Ti) has been proposed to enhance osseointegration in medical applications. However, susceptibility to microbial adhesion, linked to biomaterial-associated infections, and the high TiO₂ band gap energy, which allows light abs...
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2024
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/167279 |
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I19-R120-10915-1672792024-06-15T04:07:26Z http://sedici.unlp.edu.ar/handle/10915/167279 Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties Cajiao Checchin, Valentina Chiara Cacciari, Rodolfo Rubert, Aldo Alberto Lieblich, Marcela Caregnato, Paula Fagali, Natalia Fernández Lorenzo de Mele, Mónica Alicia 2024 2024-06-14T16:09:06Z en Química Irradiation Metal nanoparticles Nanotubes Oxides X-ray photoelectron spectroscopy Electrochemical modification of the Ti surface to obtain TiO₂ nanotubes (NT-Ti) has been proposed to enhance osseointegration in medical applications. However, susceptibility to microbial adhesion, linked to biomaterial-associated infections, and the high TiO₂ band gap energy, which allows light absorption almost exclusively in the ultraviolet (UV) region, limit its applications. Modifying the TiO₂ semiconductor with metals such as Ag has been suggested both for antimicrobial purposes and for absorbing light in the visible region. The formation of NT-Ti with Ag micropatches (Ag-NT-Ti) is pursued with the objective of enhancing the stability of the deposits and preventing cytotoxic levels of Ag cellular uptake. The innovative process proposed here involves immersing NT-Ti in a AgNO₃ solution as the initial step. Diverging from previously reported electrochemical methods, this process incorporates anodization within the TiO₂ oxide formation region instead of cathodic reduction generally employed by other researchers. The final step encompasses an annealing treatment. The treatments result in the in situ Ag¹⁺ reduction and formation of stable and active micropatches of metallic Ag on the NT-Ti surface. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman, diffuse reflectance spectroscopy (DRS), wettability assessment, and electrochemical characterizations were conducted to evaluate the modified surfaces. The well-known properties of NT-Ti surfaces were enhanced, leading to improved photocatalytic activity across both visible and UV regions, significant stability against detachment, and controlled release of Ag¹⁺ for promising antimicrobial effects. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) application/pdf 9644−9654 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Química Irradiation Metal nanoparticles Nanotubes Oxides X-ray photoelectron spectroscopy |
| spellingShingle |
Química Irradiation Metal nanoparticles Nanotubes Oxides X-ray photoelectron spectroscopy Cajiao Checchin, Valentina Chiara Cacciari, Rodolfo Rubert, Aldo Alberto Lieblich, Marcela Caregnato, Paula Fagali, Natalia Fernández Lorenzo de Mele, Mónica Alicia Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties |
| topic_facet |
Química Irradiation Metal nanoparticles Nanotubes Oxides X-ray photoelectron spectroscopy |
| description |
Electrochemical modification of the Ti surface to obtain TiO₂ nanotubes (NT-Ti) has been proposed to enhance osseointegration in medical applications. However, susceptibility to microbial adhesion, linked to biomaterial-associated infections, and the high TiO₂ band gap energy, which allows light absorption almost exclusively in the ultraviolet (UV) region, limit its applications. Modifying the TiO₂ semiconductor with metals such as Ag has been suggested both for antimicrobial purposes and for absorbing light in the visible region. The formation of NT-Ti with Ag micropatches (Ag-NT-Ti) is pursued with the objective of enhancing the stability of the deposits and preventing cytotoxic levels of Ag cellular uptake. The innovative process proposed here involves immersing NT-Ti in a AgNO₃ solution as the initial step.
Diverging from previously reported electrochemical methods, this process incorporates anodization within the TiO₂ oxide formation region instead of cathodic reduction generally employed by other researchers. The final step encompasses an annealing treatment.
The treatments result in the in situ Ag¹⁺ reduction and formation of stable and active micropatches of metallic Ag on the NT-Ti surface. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman, diffuse reflectance spectroscopy (DRS), wettability assessment, and electrochemical characterizations were conducted to evaluate the modified surfaces. The well-known properties of NT-Ti surfaces were enhanced, leading to improved photocatalytic activity across both visible and UV regions, significant stability against detachment, and controlled release of Ag¹⁺ for promising antimicrobial effects. |
| format |
Articulo Articulo |
| author |
Cajiao Checchin, Valentina Chiara Cacciari, Rodolfo Rubert, Aldo Alberto Lieblich, Marcela Caregnato, Paula Fagali, Natalia Fernández Lorenzo de Mele, Mónica Alicia |
| author_facet |
Cajiao Checchin, Valentina Chiara Cacciari, Rodolfo Rubert, Aldo Alberto Lieblich, Marcela Caregnato, Paula Fagali, Natalia Fernández Lorenzo de Mele, Mónica Alicia |
| author_sort |
Cajiao Checchin, Valentina Chiara |
| title |
Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties |
| title_short |
Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties |
| title_full |
Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties |
| title_fullStr |
Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties |
| title_full_unstemmed |
Innovative anodic treatment to obtain stable metallic silver micropatches on TiO₂ nanotubes: structural, electrochemical, and photochemical properties |
| title_sort |
innovative anodic treatment to obtain stable metallic silver micropatches on tio₂ nanotubes: structural, electrochemical, and photochemical properties |
| publishDate |
2024 |
| url |
http://sedici.unlp.edu.ar/handle/10915/167279 |
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