Colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles into Pt-Co3O4 nanowires

Pei Yuin Keng, Mathew M. Bull, In Bo Shim, Kenneth G. Nebesny, Neal R Armstrong, Younghun Sung, Kookheon Char, Dong-Chul Pyun

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

In this report, functional one-dimensional (1-D) Pt-Co3O 4 heterostruc-tures with enhanced electrochemical properties were synthesized via colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles (PS-CoNPs). Colloidal polymerization of dipolar nanoparticles into hollow metal-semiconductor nanowires was achieved via a consecutive galvanic replacement reaction between Co0 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 nanoparticles (PtNPs; D ∼ 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 Co 3O4 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 surface composition.(Figure Presented)

Original languageEnglish (US)
Pages (from-to)1120-1129
Number of pages10
JournalChemistry of Materials
Volume23
Issue number5
DOIs
StatePublished - Mar 8 2011

Fingerprint

Cobalt
Nanowires
Polymers
Polymerization
Nanoparticles
Surface structure
Calcination
Heterojunctions
Transmission electron microscopy
Scanning electron microscopy
Oxides
Platinum
Electrochemical properties
Field emission
Cyclic voltammetry
Hydrogenation
Capacitance
X ray photoelectron spectroscopy
Metals
Semiconductor materials

Keywords

  • colloids
  • hybrid inorganic/organic materials
  • magnetic materials

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles into Pt-Co3O4 nanowires. / Keng, Pei Yuin; Bull, Mathew M.; Shim, In Bo; Nebesny, Kenneth G.; Armstrong, Neal R; Sung, Younghun; Char, Kookheon; Pyun, Dong-Chul.

In: Chemistry of Materials, Vol. 23, No. 5, 08.03.2011, p. 1120-1129.

Research output: Contribution to journalArticle

Keng, Pei Yuin ; Bull, Mathew M. ; Shim, In Bo ; Nebesny, Kenneth G. ; Armstrong, Neal R ; Sung, Younghun ; Char, Kookheon ; Pyun, Dong-Chul. / Colloidal polymerization of polymer-coated ferromagnetic cobalt nanoparticles into Pt-Co3O4 nanowires. In: Chemistry of Materials. 2011 ; Vol. 23, No. 5. pp. 1120-1129.
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