کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5788773 | 1414269 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tunable synthesis solid or hollow Au-Ag nanostructure, assembled with GO and comparative study of their catalytic properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, we demonstrated a simple and efficacious two-step method for the synthesis of Ag@Au core-shell nanoparticles (Ag@AuNPs) and the Ag/Au hollow nanocages (Ag/AuNCs) with Ag nanoparticles (AgNPs) as seeds by adjusting pH, and the preparation of hybrid Ag@AuNPs- or Ag/AuNCs-graphene oxide nanocomposites (Ag@AuNPs-GO or Ag/AuNCs-GO) based on the self-assembly. It was noticed from the electrostatic assembly experiment that the loading amount of Ag/AuNCs on GO nanosheet was more than that of Ag@AuNPs. The as-synthesized hybrid materials were characterized by transmission electron microscopy, atomic force microscopy, ζ-potential, high-angle annular dark-field scanning transmission electron microscopy, thermogravimetric analyzer and X-ray diffraction. Catalytic activities of Ag@AuNPs, Ag/AuNCs and Ag/AuNCs-GO nanostructures were investigated in the reduction of 4-, 3- or 2-nitrophenol to 4-, 3- or 2-aminophenol, and on the basis of comparative kinetic studies the following trend was obtained for the related catalytic activity: Ag/AuNCs-GO > Ag/AuNCs > Ag@AuNPs. These observations were attributed to the simultaneous effects of surface area available for catalytic reaction and composition of the hybrid nanostructures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science Bulletin - Volume 61, Issue 19, October 2016, Pages 1525-1535
Journal: Science Bulletin - Volume 61, Issue 19, October 2016, Pages 1525-1535
نویسندگان
Lidan Xu, Min Hong, Yongliang Wang, Ming Li, Haibo Li, Madhavan P.N. Nair, Chen-Zhong Li,