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Title: Microwave-assisted combustion synthesis of Ag/ZnO nanocomposites and their photocatalytic activities under ultraviolet and visible-light irradiation

Highlights: • Ag/ZnO nanocomposites were synthesized by a microwave-assisted combustion method. • Ag/ZnO nanocomposites exhibited improved photocatalytic activities under UV irradiation. • Poorer photocatalytic performances were obtained under visible-light irradiation. - Abstract: Ag/ZnO nanocomposites were synthesized by a rapid one-step microwave-assisted combustion method. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence and ultraviolet–visible spectrophotometry. XRD results showed that hexagonal ZnO and cubic Ag were obtained. Ag nanoparticles were chemically attached on the surface of ZnO. The decrease in the energy band gap of Ag/ZnO nanocomposites and the photoluminescence quenching were observed while the Ag content was increased. Furthermore, the introduction of Ag nanoparticles leads to significantly improved photocatalytic activities in the case of ultraviolet irradiation, but in the case of visible-light irradiation opposite results were obtained. The corresponding mechanism was discussed in detail.
Authors:
; ;  [1] ;  [2] ; ; ;  [3] ;  [3]
  1. School of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong 252000 (China)
  2. LED-Marin Convergence Technology R and BD Center, Pukyong National University, Busan 608-739 (Korea, Republic of)
  3. Department of Physics and Interdisciplinary Program of Biomedical, Mechanical and Electrical Engineering, Pukyong National University, Busan 608-737 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22420771
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 61; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRRADIATION; MICROWAVE RADIATION; NANOCOMPOSITES; NANOPARTICLES; OPTICAL PROPERTIES; PHOTOCATALYSIS; PHOTOLUMINESCENCE; SCANNING ELECTRON MICROSCOPY; SILVER; SPECTROPHOTOMETRY; SURFACES; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; VISIBLE RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC OXIDES