聚合物包覆的铁磁性纳米粒子的胶态聚合反应生成氧化钴纳米线。

Colloidal polymerization of polymer-coated ferromagnetic nanoparticles into cobalt oxide nanowires.

机构信息

Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA.

出版信息

ACS Nano. 2009 Oct 27;3(10):3143-57. doi: 10.1021/nn900483w.

PMID:19799415

Abstract

The preparation of polystyrene-coated cobalt oxide nanowires is reported via the colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles (PS-CoNPs). Using a combination of dipolar nanoparticle assembly and a solution oxidation of preorganized metallic colloids, interconnected nanoparticles of cobalt oxide spanning micrometers in length were prepared. The colloidal polymerization of PS-CoNPs into cobalt oxide (CoO and Co(3)O(4)) nanowires was achieved by bubbling O(2) into PS-CoNP dispersions in 1,2-dichlorobenzene at 175 degrees C. Calcination of thin films of PS-coated cobalt oxide nanowires afforded Co(3)O(4) metal oxide materials. Transmission electron microscopy (TEM) revealed the formation of interconnected nanoparticles of cobalt oxide with hollow inclusions, arising from a combination of dipolar assembly of PS-CoNPs and the nanoscale Kirkendall effect in the oxidation reaction. Using a wide range of spectroscopic and electrochemical characterization techniques, we demonstrate that cobalt oxide nanowires prepared via this novel methodology were electroactive with potential applications as nanostructured electrodes for energy storage.

摘要

报道了一种通过聚合物包覆的铁磁性钴纳米粒子（PS-CoNPs）的胶态聚合来制备聚苯乙烯包覆的氧化钴纳米线的方法。通过偶极子纳米粒子组装和预组织金属胶体的溶液氧化的组合，制备了长达数微米的相互连接的氧化钴纳米颗粒。通过在 175°C 的 1,2-二氯苯中将 O2 鼓泡到 PS-CoNP 分散体中，将 PS-CoNP 胶态聚合为氧化钴（CoO 和 Co(3)O(4)）纳米线。PS 包覆的氧化钴纳米线的薄膜的煅烧得到了 Co(3)O(4)金属氧化物材料。透射电子显微镜（TEM）显示了由 PS-CoNP 的偶极子组装和氧化反应中的纳米级 Kirkendall 效应的组合产生的具有空心夹杂物的相互连接的氧化钴纳米颗粒的形成。使用广泛的光谱和电化学特性技术，我们证明了通过这种新方法制备的氧化钴纳米线具有电活性，潜在应用于储能的纳米结构电极。