ALD-induced TiO2/Ag nanofilm for rapid surface photodynamic ion sterilization

Abstract

The daily life of people in the intelligent age is inseparable from electronic device, and a number of bacteria on touch screens are increasingly threatening the health of users. Herein, a photocatalytic TiO 2 /Ag thin film was synthesized on a glass by atomic layer deposition and subsequent in situ reduction. Ultraviolet–visible (UV-Vis) spectra showed that this film can harvest the simulated solar light more efficiently than that of pristine TiO 2 . The antibacterial tests in vitro showed that the antibacterial efficiency of the TiO 2 /Ag film against S. aureus and E. coli was 98.2% and 98.6%, under visible light irradiation for 5 min. The underlying mechanism was that the in-situ reduction of Ag on the surface of TiO 2 reduced the bandgap of TiO 2 from 3.44 to 2.61 eV due to the formation of Schottky heterojunction at the interface between TiO 2 and Ag. Thus, TiO 2 /Ag can generate more reactive oxygen species for bacterial inactivation on the surface of electronic screens. More importantly, the TiO 2 /Ag film had great biocompatibility with/without light irradiation. The platform not only provides a more convenient choice for the traditional antibacterial mode but also has limitless possibilities for application in the field of billions of touch screens. Graphical abstract

In-situ electrochemical fabrication of Ag@AgCl NW-PET film with superior photocatalytic bactericidal activity

“…The sterilization efficiency of Ag@AgCl-0.5 V film reached 99.99% under simulated Sunlight irradiation for 2 h. Compared with Ag-AgCl powder, the disinfection rate of Ag@AgCl-0.5 V film (99.99%, 120 min) is slightly slower than that of the powder sample (99.53%, 30 min) when the amount of catalyst (1.2 mg/1 mg) and bacteria-containing solution (10 6 CFU ml −1 , 20 ml/10 7 CFU ml −1 , 10 ml) are similar (table S1) [44]. The bacterial disinfection performance is comparable to that of many known semiconductor photocatalyst films [48][49][50][51][52][53]. Hence, Ag@AgCl-PET film is a promising photocatalyst for photo-disinfection.…”

Interfacial and Defect Polarization Enhanced Microwave Noninvasive Therapy for Staphylococcus aureus-Infected Chronic Osteomyelitis

“…ESR/EPR curves of MoS 2 , Ti 3 C 2 T x , U-MoS 2 /Ti 3 C 2 T x , and HU-MoS 2 /Ti 3 C 2 T x (1 mg/mL) were tested by electron spin paramagnetic resonance spectroscopy (ESR/EPR; JES-FA200, Japan). , Specifically, for ESR testing, 2 mL of the solution was microwaved for 3 min and TEMP was added to capture free radicals generated. It is worth mentioning that TEMP was added to the aqueous solution for the detection of singlet oxygen ( 1 O 2 ).…”

Antibacterial coatings on orthopedic implants

“…Cai et al. [ 318 ] prepared TiO 2 /Ag photocatalytic nanofilms by the atomic layer deposition technique and in situ photoreduction process, which broadened the light absorption range from the UV light to the visible light. Due to the contact potential difference between TiO 2 and AgNPs, their combination at the surface interface formed a Schottky heterojunction, which generated ROS while hindering the electron-hole recombination rate, greatly improving the photocatalytic effect.…”