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Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold
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Pei Feng, Haifeng Tian, Feng Yang, Shuping Peng, Hao Pan4,Cijun Shuai. Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold[J]. Journal of Zhejiang University Science D, 2016, -1(-1): .
@article{title="Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold",
author="Pei Feng, Haifeng Tian, Feng Yang, Shuping Peng, Hao Pan4,Cijun Shuai",
journal="Journal of Zhejiang University Science D",
volume="-1",
number="-1",
pages="",
year="2016",
publisher="Zhejiang University Press & Springer",
doi="10.1007/s42242-BDMJ-D-23-00372"
}
%0 Journal Article
%T Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold
%A Pei Feng
%A Haifeng Tian
%A Feng Yang
%A Shuping Peng
%A Hao Pan4
%A Cijun Shuai
%J Journal of Zhejiang University SCIENCE D
%V -1
%N -1
%P
%@ 1673-1581
%D 2016
%I Zhejiang University Press & Springer
%DOI 10.1007/s42242-BDMJ-D-23-00372
TY - JOUR
T1 - Reduced graphene oxide-mediated electron-hole separation in titanium dioxide for boosting photocatalytic antibacterial activity of bone scaffold
A1 - Pei Feng
A1 - Haifeng Tian
A1 - Feng Yang
A1 - Shuping Peng
A1 - Hao Pan4
A1 - Cijun Shuai
J0 - Journal of Zhejiang University Science D
VL - -1
IS - -1
SP -
EP -
%@ 1673-1581
Y1 - 2016
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1007/s42242-BDMJ-D-23-00372
Abstract: Fast electron-hole recombination in the photocatalysis process of titanium dioxide (TiO2)
limits its application in preventing bacterial infection for bone defect repair. In this study,
TiO2@reduced graphene oxide (rGO) composites were synthesized through a hydrothermal
method, in which rGO with superior electrical conductivity promoted the separation of
photoelectron-hole pairs of TiO2, thus improving the efficiency of photocatalytic production of
reactive oxygen species (ROS). Subsequently, the TiO2@rGO composites were introduced into
poly-l-lactic acid (PLLA) to prepare bone scaffold with photocatalytic antibacterial function
via selective laser sintering. It showed that TiO2 grew on the surface of rGO and formed a
covalent bond connection (Ti-O-C) with rGO. The electrochemical impedance of TiO2@rGO
composites was decreased, and the transient photocurrent intensity was increased from 0.05
μA/cm2
to 0.5 μA/cm2
. The electron spin resonance resulted that the photocatalytic products of
TiO2 were •OH and •O2
−
, which were two kinds of ROS that could kill bacteria via destroying
Preprint of Bio-Design and Manufacturing (unedited)
the bacterial membrane structure in vitro antibacterial experiment. The antibacterial rates of
PLLA/TiO2@rGO scaffold against E. coli and S. aureus were 60% and 71%, respectively.
Additionally, the scaffold exhibited enhanced mechanical properties due to the addition of
TiO2@rGO as reinforcement phase and good biocompatibility for cell activity and proliferation.
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