Colloidal Polymerization of Polymer-Coated Ferromagnetic Cobalt Nanoparticles into Pt-Co3O4 Nanowires

被引：49

作者：

Keng, Pei Yuin ^{[1
]}

Bull, Mathew M. ^{[1
]}

Shim, In-Bo ^{[2
]}

Nebesny, Kenneth G. ^{[1
]}

Armstrong, Neal R. ^{[1
]}

Sung, Younghun ^{[3
]}

Char, Kookheon ^{[3
]}

Pyun, Jeffrey ^{[1
,3
]}

机构：

[1] Univ Arizona, Dept Chem, Tucson, AZ 85721 USA

[2] Kookmin Univ, Dept Nano & Elect Phys, Seoul 136702, South Korea

[3] Seoul Natl Univ, Dept Chem & Biol Engn, World Class Univ Program Chem Convergence Energy, Seoul 151744, South Korea

来源：

CHEMISTRY OF MATERIALS | 2011年 / 23卷 / 05期

关键词：

colloids; hybrid inorganic/organic materials; magnetic materials; ONE-POT SYNTHESIS; SELECTIVE GROWTH; SOLAR-ENERGY; QUANTUM-DOT; CONTROLLABLE SYNTHESIS; METAL NANOSTRUCTURES; HOLLOW NANOCRYSTALS; ENHANCED ACTIVITY; MESOPOROUS CO3O4; SPINEL CO3O4;

D O I：

10.1021/cm102319d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this report, functional one-dimensional (1-D) Pt-Co3O4 heterostructures with enhanced electrochemical properties were synthesized via colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles (PS-CoNPs). Colloidal polymerization of dipolar nanopartides into hollow metal semiconductor nanowires was achieved via a consecutive galvanic replacement reaction between Co-0 and Pt2+ precursors, followed by a nanoscale Kirkendall oxidation reaction and a calcination treatment. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-angle annular dark field scanning TEM (HAADF-STEM), and field-emission scanning electron microscopy (FESEM) revealed the structural and morphological evolution of the hollow cobalt oxide nanowires (D = 40 nm) with platinum nanopartides (PtNPs; D similar to 2 nm) entrapped within the growing oxide shell. Various calcination conditions were investigated via X-ray photoelectron spectroscopy (XPS) to obtain the optimal surface composition of the metallic Pt and semiconducting Co3O4 phases. Cyclic voltammetry of the 1-D Pt-Co3O4 heterostructures demonstrated a sevenfold enhancement in specific capacitance in comparison to the pristine Co3O4 nanowires. Preliminary results also showed that the calcined 1-D Pt-Co3O4 heterostructures catalytically hydrogenate methyl orange, and the rates of the hydrogenation were dependent on sin-face composition.

引用

页码：1120 / 1129

页数：10

共 106 条

[1] Highly Sensitive Amperometric Cholesterol Biosensor Based on Pt-Incorporated Fullerene-like ZnO Nanospheres [J].