Annealing-Induced Antibacterial Activity in TiO2 under
Ambient Light
Version 2 2017-10-20, 15:49
Version 1 2017-10-20, 15:48
Posted on 2017-10-20 - 15:49
We demonstrate that annealing at
850 °C in the presence of
Cu universally results in robust antibacterial activity under ambient
illumination for TiO2 nanoparticles, different from those
annealed in a quartz crucible without metal or in the presence of
Ti. Resulting robust antibacterial activity occurred after annealing
regardless of the initial properties and crystal structure of the
starting samples (two anatase, one rutile, and P25). A clear difference
in the powder color from white to gray and a pure rutile crystal structure
is observed after annealing in all of the samples. ESR measurements,
however, reveal obvious differences in the defects present in the
samples annealed under different conditions. Strong antibacterial
activity is observed under ambient illumination for samples annealed
in the presence of Cu, despite the lower activity for photocatalytic
degradation of common dyes such as methylene blue after annealing.
Antibacterial activity could not be attributed to the presence of
Cu (no activity in the dark) or to the ROS production (none detected
under ambient illumination). This indicates that other mechanisms,
such as direct charge transfer involving defect levels induced by
annealing in the presence of copper, may play a role in the observed
antibacterial activity.
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Guo, Mu Yao; Liu, Fangzhou; Leung, Yu Hang; He, Yanling; Ng, Alan Man Ching; Djurišić, Aleksandra B.; et al. (2017). Annealing-Induced Antibacterial Activity in TiO2 under
Ambient Light. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.7b07325
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AUTHORS (9)
MG
Mu Yao Guo
FL
Fangzhou Liu
YL
Yu Hang Leung
YH
Yanling He
AN
Alan Man Ching Ng
AD
Aleksandra B. Djurišić
HL
Hangkong Li
KS
Kaimin Shih
WC
Wai Kin Chan