Facile preparation of Sb and oxide-coated Sb nanoparticles via cathodic dispersion of bulk Sb in different media

Facile preparation of Sb and oxide-coated Sb nanoparticles via cathodic dispersion of bulk Sb in different media
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通过将块状锑阴极分散在不同介质中,轻松制备锑和氧化物包覆的锑纳米粒子

DOI:
10.1007/s10008-011-1432-6
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发表时间:
2012-02
影响因子:
2.5
通讯作者:
Li, Zelin
Li, Zelin
中科院分区:
工程技术4区
文献类型:
--
作者:
Yang, Yingchang;Huang, Wei;Zheng, Jufang;Li, Zelin

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我们在这里报告了一个简单的电化学方法制备锑纳米粒子(NPs)的分散体锑电极在不同的介质中,在室温下,既不需要前体离子,也不需要有机封端剂的高度阴极极化。锑在四丁基溴化铵(TBAB)乙腈溶液中的分散涉及锑的不稳定Zintl化合物的形成和氧化,并且由于空气中的氧气对Sb NPs的表面氧化,所制备的Sb NPs在后处理和表征期间容易地转移到Sb-Sb 2 O3核-壳NPs。相比之下,通过将本体锑阴极分散在空白NaOH水溶液中制备的Sb NP在空气中是耐氧的,因为来自溶液的强吸附的氢氧根离子可以稳定Sb NP。钠的掺入、锑的聚阴离子(Zintl离子)的形成/氧化、以及不稳定的锑化物的形成/分解都可能对本体锑电极在NaOH溶液中的阴极分散起作用。采用透射电子显微镜、X射线衍射、X射线光电子能谱和拉曼光谱对纳米粒子进行了表征。
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–Sb2O3core–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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