期刊
MATERIALS & DESIGN
卷 177, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2019.107845
关键词
NIR photocatalysis; Antibacterial; Au nanoparticles; Upconversion; Carbon quantum dots
资金
- National Key Research and Development Program of China [2016YFC1100600, 2016YFC1100604]
- Natural Science Foundation of Hubei Province [2018CFA064]
- National Natural Science Foundation of China [51671081, 51871162, 51801056]
- Hong Kong Research Grants Council (RGC) General Research Funds (GRF) [11301215, 11205617, 17214516]
- RGC/NSFC [N_ HKU725-16]
- Hong Kong ITC [ITS/287/17, GHX/002/14SZ]
- Health and Medical Research Fund [03142446]
The excellent photocatalysis is quite important for coating materials on implants, which can be photoinspired to kill bacteria by locally producing the reactive oxygen species (ROS) within a very short time. Herein, we developed a novel photocatalytic system of Au nanoparticles and carbon quantum dots loaded TiO2 nanotube array (TNTs/Au/CDs) on the surface of titanium. This system can exhibit enhanced near-infrared (NIR) light photocatalysis and photothermy because CDs can convert NIR light into the light of 500-600 nm and transfer electrons, which can inspire nano Au-catalyzed TNTs to generate ROS and enhance the surface plasmon resonance (SPR) effect of Au nanoparticles to produce more local photothermy. The enhanced photocatalysis and local photothermy can exhibit a synergistic effect to kill the bacteria highly effectively within a very short time by damaging the membranes of the bacteria. The antibacterial efficiency of the modified surface is 96.19% and 99.89% against Staphylococcus aureus and Escherichia colt, respectively, under 808 nm NIR light irradiation for 15 min. (C) 2019 The Authors. Published by Elsevier Ltd.
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