Facile preparation of Sb and oxide-coated Sb nanoparticles via cathodic dispersion of bulk Sb in different media |
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Authors: | Yingchang Yang Wei Huang Jufang Zheng Zelin Li |
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Institution: | (1) Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081, China;(2) Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China; |
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Abstract: | We report here a facile electrochemical method on the preparation of antimony nanoparticles (NPs) by dispersing a bulk antimony
electrode under highly cathodic polarization in different media at room temperature, requiring neither precursor ions nor
organic capping agents. The dispersion of bulk antimony in a tetrabutyl ammonium bromide (TBAB) acetonitrile solution involved
the formation and oxidation of an unstable Zintl compound of antimony, and the as-prepared Sb NPs were readily transferred
into Sb–Sb2O3 core–shell NPs during the post treatment and characterization because of the surface oxidation of Sb NPs by oxygen in the
air. In contrast, Sb NPs prepared by dispersing the bulk antimony cathode in a blank aqueous NaOH solution were oxygen-resistant
in the air because the strongly adsorbed hydroxide ions from the solution could stabilize the Sb NPs. The incorporation of
sodium, the formation/oxidation of polyanions of antimony (Zintl ions), and the formation/decomposition of unstable antimony
hydrides may all take effect for the cathodic dispersion of bulk antimony electrodes in the NaOH solution. Transmission electron
microscope, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy were used to characterize these NPs. |
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