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Hydrogen Adsorption onto Nickel Modified Carbon Nanotubes

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Abstract:

The Hot Filament Chemical Vapour Deposition (HFCVD) method was employed to study hydrogen adsorption on multi-walled carbon nanotubes (MWCNTs) modified by nickel doping. Prior to the nickel doping, effective functionalisation of CNTs was achieved by treating them in HNO3/H2O2 medium. Samples were characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDS), and Fourier Transform Infrared (FTIR) and Raman spectroscopy techniques. SEM analyses revealed the morphology of the samples and the presence of nickel was identified by EDS analyses. Raman analysis revealed the enhancement of defects on the CNTs after the nickel modification. The defects created along with the catalytic activity of nickel supplied more hydrogen access to the CNTs. This was inferred from highest intensity ratio of D and G band (ID/IG) for hydrogen treated samples. However, FTIR spectra did not exhibit any C—H related bands. This confirms that the adsorption of hydrogen onto CNTs is primarily by surface adsorption.

Keywords: CARBON NANOTUBES; CHEMICAL VAPOR DEPOSITION; INFRARED SPECTROSCOPY; RAMAN SPECTROSCOPY; TRANSITION METALS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.AN25

Publication date: August 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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