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Journal of Nanoparticle Research

Erschienen in:

01.02.2011 | Research Paper

Surfactant-free synthesis of novel copper oxide (CuO) nanowire–cobalt oxide (Co₃O₄) nanoparticle heterostructures and their morphological control

verfasst von: Wenwu Shi, Nitin Chopra

Erschienen in: Journal of Nanoparticle Research | Ausgabe 2/2011

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Abstract

A simple and surfactant-free synthesis of novel heterostructures comprising of copper oxide (CuO) nanowires uniformly decorated with cobalt oxide (Co₃O₄) nanoparticles was demonstrated by combining thermal growth and wet-coating method. The heterostructures were synthesized by thermally decomposing cobalt salt (cobalt nitrate) into Co₃O₄ nanoparticles onto vapor–solid (VS)-grown CuO nanowires. X-ray diffraction (XRD) and high resolution transmission electron microscopy (TEM) confirmed the presence of CuO and Co₃O₄ phases as well as a narrow size distribution of Co₃O₄ nanoparticles (average diameter ~7.0 ± 1.5 nm) on CuO nanowires (average diameter of nanowire tips ~67.9 ± 18.6 nm). Unique interfacial lattice relationship was observed for (111) Co₃O₄ nanoparticles on (200) CuO nanowire surface resulting in hemispherical shape of the former. For the first time, further systematic studies were performed to understand the influence of various parameters (cobalt salt concentration and annealing temperature, atmosphere, and time) on the morphological evolution of Co₃O₄ nanoparticles on CuO nanowires. Interestingly, by varying these parameters, it was possible to grow Co₃O₄ in different shapes (spherical, triangular, rectangular, cubical, and hexagonal nanoparticles) and forms (shells and nanorods). It was observed that all these parameters play a critical role in influencing the surface migration, nucleation, and growth of Co₃O₄ nanoparticles on CuO nanowires and this assisted in understanding the involved growth mechanisms. Finally, UV–vis–NIR spectroscopy and band gap energies for these heterostructures were evaluated that showed higher photocatalytic degradation efficiency for Rhodamine B under low-power visible-light illumination.

Vorheriger Artikel Stability of aqueous silica nanoparticle dispersions

Nächster Artikel Synthesis, mechanical, and barrier properties of LDPE/graphene nanocomposites using vinyl triethoxysilane as a coupling agent

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Titel: Surfactant-free synthesis of novel copper oxide (CuO) nanowire–cobalt oxide (Co3O4) nanoparticle heterostructures and their morphological control
verfasst von: Wenwu Shi
Nitin Chopra
Publikationsdatum: 01.02.2011
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 2/2011
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-010-0086-0

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