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
Scripta Materialia (Impact Factor: 3.22). 06/2008; 58(11):1010-1013. DOI: 10.1016/j.scriptamat.2008.01.047


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.

Download full-text


Available from: Jae-Shin Lee
  • Source
    • "Due to good charge transporting properties and conductivity of carbon nanotube, and excellent absorption properties to organic volatiles of CuO [57], it is expected that CNT/CuO nanocomposite would have some outstanding properties or lowing the operating temperature of CuO based gas sensor. Therefore, Reddy and co-workers [58] prepared multi-walled carbon nanotubes coated with cuprous oxide nanoparticles by a new one-step synthesis method. Venkatachalam and co-workers [59] obtained in-situ formation of sandwiched structures of nanotube/CuxOy/Cu composites for lithium battery applications. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In order to enhance the sensitivity of carbon nanotube based chemical sensors at room temperature operation, CNTs/CuO nanocomposite was prepared under hydrothermal reaction condition. The resulted-product was characterized with TEM (transmission electron microscopy), XRD (X-ray diffraction) and so on. A chemical prototype sensor was constructed based on CNTs/CuO nanocomposite and an interdigital electrode on flexible polymer substrate. The gas-sensing behavior of the sensor to some typical organic volatiles was investigated at room temperature operation. The results indicated that the carbon nanotube was dispersed well in CuO matrix, the CuO was uniformly coated on the surface of carbon nanotube, and the tubular structure of carbon nanotube was clearly observed. From morphology of TEM images, it can also be observed that a good interfacial adhesion between CNT and CuO matrix was formed, which maybe due to the results of strong interaction between CNTs with carboxyl groups and CuO containing some hydroxy groups. The CNTs/CuO nanocomposite showed dramatically enhanced sensitivity to some typical organic volatiles. This study would provide a simple, low-cost and general approach to functionalize the carbon nanotube. It is also in favor of developing chemical sensors with high sensitivity or catalysts with high activity to organic volatiles at low temperature.
    Preview · Article · Dec 2012 · Procedia Engineering
  • Source
    • "Essentially, the method involves the deposition of porous SWNT mat [33] on insulating substrates, such as thermally grown silicon dioxide, followed by thermal oxidation for CuO. The advantages of this method are the omission of complex synthesis processes and the prevention of any probable damage to porosity and of toxic agents, such as when the structure is made by wet chemical methods [32]. The effects of oxidation temperatures on the morphology, crystallinity, and "
    [Show abstract] [Hide abstract]
    ABSTRACT: Porous nanowire-structured cupric oxide (CuO) film is synthesized by deposition of Cu on porous single-walled carbon nanotube (SWNT) substrate followed by a thermal oxidation process. Oxidation is done in air at a temperature range of 300–800 °C to oxidize the Cu while removing the SWNT template. The oxidation temperature determines the stoichiometry of the CuO formed, and thus the electrical property. The structures and electrical properties of the synthesized materials are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), and current–voltage measurements. Sensing property is examined using hydrogen gas. Gas sensing mechanism and the advantages of nanowire structure as a sensor are also discussed. The best response and recovery results are observed with the CuO nanowires oxidized at 400 °C at a working temperature of 250 °C.
    Full-text · Article · Apr 2010 · Sensors and Actuators B Chemical
  • Source
    • "The diffraction peaks at 29.71°, 36.58°, 42.50°, 61.66°, 73.90° and 77.72° corresponding to (110), (111), (200), (220), (311) and (222) crystal planes of Cu 2 O, respectively, indicate the formation of Cu 2 O nanocrystals (Reddy et al. 2008 "
    [Show abstract] [Hide abstract]
    ABSTRACT: Cu (I) phenyl acetylide was used as a source of copper to achieve a homogeneous distribution of Cu2O nanocrystals (10–80nm) decorated on multiwalled carbon nanotubes (MWCNTs) having an average diameter of 10nm. Pristine MWCNTs were first oxygen-functionalized by treating them with a mixture of concentrated (H2SO4/HNO3 : 3/1) acids and the products were characterized by X-ray powder diffraction, transmission and scanning electron microscopy, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy and thermogravimetric analysis. An easy, efficient and one-step impregnation method was followed to produce copper-containing nanoparticles on the MWCNTs. The copper-treated MWCNTs dried at room temperature were seen to be well decorated by copper-containing nanoparticles on their outer surface. The MWCNTs were then heat-treated at 400°C in a nitrogen atmosphere to produce a homogeneous distribution of cuprous oxide nanocrystals on their surface. By varying the ratio of copper to oxygen-functionalized MWCNTs, Cu2O nanocrystals decorated on MWCNTs with different copper content can be obtained.
    Preview · Article · Feb 2010 · Journal of Nanoparticle Research
Show more

Questions & Answers about this publication