A new one-step synthesis method for coating multi-walled carbon nanotubes with cuprous oxide nanoparticles

Department of Chemistry, University of Ulsan, Ulsan 680-749, Republic of Korea; School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea; Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea
Scripta Materialia 01/2008; DOI: 10.1016/j.scriptamat.2008.01.047

ABSTRACT A new method was developed for the synthesis of Cu2O-coated multi-walled carbon nanotubes (MWCNTs) on the basis of Fehling’s reaction. The method involved dispersion of carbon nanotubes in Fehling’s reagent, followed by addition of formaldehyde as a reducing agent. The Cu2O-coated MWCNTs were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron, Raman and UV–Vis spectroscopy, and superconducting quantum interference device measurements. These novel materials could be used in catalysis and optoelectronic applications.

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    ABSTRACT: Nanocomposites composed of carbon nanotubes (CNTs) and magnetite (Fe3O4) nanoparticles were fabricated by using ethylene glycol as reductant at 160°C. The composites were subsequently annealed under different temperatures in an inert atmosphere. The products were characterized by transmission electron microscopy (TEM), high resolution TEM, X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The results showed that the Fe3O4 transformed from amorphous phase into single crystalline nanoparticles after annealing and that the annealing temperature played a crucial role in controlling the size and the size distribution of Fe3O4 nanoparticles. The average size of Fe3O4 nanoparticles increased with increasing annealing temperature. Meanwhile, the size distribution of nanoparticles became wide with the increase of temperature. It was caused by the gradual decomposition of oleate groups attached on the CNT surface. Magnetic hysteresis loop measurements revealed that crystalline Fe3O4/CNTs displayed superparamagnetic behavior under room temperature.
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