Journal
APPLIED SURFACE SCIENCE
Volume 412, Issue -, Pages 58-68Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.03.207
Keywords
ZnO/rGO composite; Chemical etching method; Optical property; Size- and composition-dependent photocatalytic property
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Funding
- National Natural Science Foundation of China [51672252, 51102215]
- Public Utility Items of Zhejiang Province [2015C31022]
- Natural Scientific Foundation of Zhejiang Province [LY14B010001]
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ZnO with various morphologies and contents was used to decorate reduced graphene oxide (rGO) sheets via an easy one-step low-temperature chemical etching route to improve photocatalytic properties. The ZnO shape and content in ZnO/rGO composites were adjusted by changing aging time, heating mode, and rGO mass added. Shape and content-dependent optical and photocatalytic properties are observed in ZnO/rGO composites. A moderate amount of ZnO nanorings (NRs) decorated with rGO can significantly improve the light absorption and photo-luminescence emission because of plasmonic resonant absorption and plasmonic nanoantenna radiation, respectively. ZnO NR/rGO composites with a moderate ZnO content of 29.54 wt.% exhibit the optimum photocatalytic activity with a 0.025 min(-1) apparent rate constant, which is significantly higher than those of pure rGO (0.0085 min(-1)) and ZnO NRs (0.018 min(-1)). The improved performance is ascribed to the synergistic effect of enhanced adsorption capacity, plasmonic light absorption, plasmonic nanoantenna radiation, and the prolonged lifetime of photogenerated electron-hole pairs. Our findings not only offer insights into the plasmon enhanced optical and photocatalytic properties of ZnO NR/rGO composites but also suggest the possibility of fabricating ZnO NR/rGO photocatalyst with enhanced performance. (C) 2017 Elsevier B.V. All rights reserved.
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