Journal
NANO ENERGY
Volume 46, Issue -, Pages 29-38Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.01.033
Keywords
Bacteria killing; Wound healing; Photodynamic therapy; Piezophototronic effect; Localized surface plasmon resonance (LSPR)
Categories
Funding
- National Natural Science Foundation of China [81471784]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2015023]
- Nature Science Foundation of Beijing [2172058]
- Thousands Talents program for pioneer researcher and his innovation team, China
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Bacteria induced infectious diseases have threated the lives and health of millions people each year. Nanosized titanium dioxide (TiO2) have been developed for photodynamic bacterial killing with minimal drug resistance, but the efficiency was restricted by their large band gap, limited light-absorption region, and rapid electron-hole recombination. In this work, we rationally fabricated a TiO2/BTO/Au multilayered coaxial heterostructured nanorod array by inserting a ferroelectric semiconductor barium titanate (BaTiO3) nanolayer between TiO2 nanorod and gold nanoparticles (AuNPs). The TiO2/BTO/Au heterostructure showed greatly enhanced reactive oxygen species (ROS) (superoxide (O-2 center dot(-)) and hydroxyl radicals (center dot OH)) generation, and incident photo-electron conversion efficiency (IPCE) in UV/visible light region. On the basis of experimental observations, the detailed photodynamic mechanism of the enhanced ROS generation was proposed, mainly ascribed to the piezo-phototronic effect and plasmonic property of the nanorod array. The nanorod array was used as an antibacterial coating to kill gram-negative bacterium E. coli and gram-positive bacterium S. Aureus with an antibacterial efficiency up to 99.9% under simulated sunlight. It also showed an efficient promotion of infectious wound regeneration in mice with S. aureus infected dermal wounds.
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