期刊
APPLIED SURFACE SCIENCE
卷 427, 期 -, 页码 771-778出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.08.112
关键词
Block copolymers; Au nanoparticles; CeO2 nanoparticles; Janus-like nanoparticles
类别
资金
- National Natural Science Foundation of China [51173069, 51473068]
A simple approach towards the fabrication of Au-CeO2 Janus-like nanoparticles is presented. Composite micelles of polystyrene-block-poly (ethylene oxide) (PS-b-PEO)/Ce(NO3)(3)/HAuCl4 with HAuCl4 and Ce(NO3)(3) precursors incorporated in the PEO domains are prepared first. By manipulating the pH value of the composite micelles solution, a redox reaction between Au(III) with Ce(III) in the PEO domains occurs and Au-CeO2 Janus-like nanoparticles composed of a porous CeO2 and an Au nanoparticle are generated. X-ray diffraction (XRD), UV-vis spectrum (UV), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) measurements are employed to characterize the Janus-like nanoparticles. The catalytic degradation of methyl orange dye (MO) under ultrasonic irradiation is chosen as the test reaction to examine the catalytic activity of the Au-CeO2 Janus-like nanoparticles. It is found that Au-CeO2 Janus-like nanoparticles show higher activity than that of CeO2 nanoparticles or Au-CeO2 composite nanoparticles. The increased catalytic activity of Au-CeO2 Janus-like nanoparticles is attributed to the exposed Au core on one side of the Janus nanoparticles and the Au-CeO2 heterointerfaces. (C) 2017 Elsevier B.V. All rights reserved.
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