Gold Nanoparticles Decorated Titanium Oxide Nanotubes with Enhanced Antibacterial Activity Driven by Photocatalytic Memory Effect

Abstract

Titanium and its alloys have been widely used for orthopedic and dental implants. However, implant failures often occur due to the implant-related bacterial infections. Herein, titanium oxide nanotubes (TNTs) with an average diameter of 75 nm were formed by anodizing on the surface of titanium, and subsequently gold (Au) nanoparticles were deposited on TNTs by magnetron sputtering (Au@TNTs). The antibacterial study shows that TNTs surface decorated with Au nanoparticles exhibits the preferable effect in restricting the growth of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) even under dark conditions, and the antibacterial rates reached 84% and 75%, respectively. In addition, the constructed film showed no cytotoxicity. Such a selective bactericidal effect of Au@TNTs samples might be attributed to the photocatalytic memory effect, which provides a new insight in the designing of antibacterial surfaces for biomedical application.

Enhancing Photocatalytic Properties of TiO2 Photocatalyst and Heterojunctions: A Comprehensive Review of the Impact of Biphasic Systems in Aerogels and Xerogels Synthesis, Methods, and Mechanisms for Environmental Applications

“…Biphasic TiO 2 heterojunctions exhibit promising applications in the field of biology and biomedicine, particularly in the creation of active self-disinfecting antiviral surfaces [146]. The photocatalytic properties of TiO 2 are leveraged to develop surfaces that can harness light energy to generate reactive oxygen species, leading to the inactivation of viruses and other pathogens on contact [147]. This technology holds immense potential for mitigating the spread of infections in healthcare settings, public spaces, and everyday objects.…”

The Influence of SnO2 and Noble Metals on the Properties of TiO2 for Environmental Sustainability

“…Due to their surface plasmon resonance (SPR) effects, Au and Ag nanoparticles are chosen over many other plasmonic or semiconductor composite materials due to their stability, non-toxicity, and biocompatibility. The efficiency of the semiconductor surface can be improved by increasing the absorption of organic dyes, extending light absorption into the visible range, and maintaining efficient charge separation/carrier transport to the photocatalyst surface, as demonstrated for a variety of TiO 2 nanostructures loaded with Au/Ag NPs [13,14]. Dye pollution from the paper, tanning, cosmetic, textile, and paint industries represents a significant proportion of the overall water pollution.…”

Multi-Walled Carbon Nanotubes Modified NiCo2S4 for the Efficient Photocatalytic Reduction of Hexavalent Chromium

“…It has been extensively studied in environmental and energy fields [30][31][32][33]. More and more semiconductor photocatalysts [34] are being investigated and applied for Cr(VI) reduction, hydrogen production, carbon dioxide reduction, and the degradation of organic pollutants such as TiO 2 [35][36][37][38], g-C 3 N 4 [39][40][41], ZnIn 2 S 4 [42,43], NiCo 2 S 4 [43], CuS [44], and BiVO 4 [39,45]. Unmodified photocatalysts tend to have a short photogenerated carrier lifetime and low specific surface area, leading to inefficient photocatalysis, which limits their development and practical application [46].…”