Ultrafine platinum nanoparticles uniformly dispersed on arrayed CN x nanotubes with high electrochemical activity
Journal
Chemistry of Materials
Journal Volume
17
Journal Issue
14
Pages
3749-3753
Date Issued
2005
Author(s)
Abstract
The structure and electrochemical properties of arrayed nitrogen-containing carbon nanotube (CM x NT)-platinum nanoparticle (Pt NP) composites directly grown on Si substrates have been investigated. The CN x nanotube arrays were grown by microwave-plasma-enhanced chemical vapor deposition first and then acted as the template and support for Pt dispersion in the following sputtering process. Under the same sputtering conditions, it was found that well-separated Pt NPs would form with an average diameter of 2 nm on the arrayed NTs while a continuous Pt thin film was observed on the bare Si substrate. X-ray photoelectron spectroscopy (XPS), X-ray diffraction, and electron microscopy were employed to study bonding and structure changes with increasing deposition time. Implications of the C1s and N1s bonding changes in XPS and their possible relation to the NT-Pt composite structures with self-limited size distribution are discussed. Cyclic voltammograms show well-behaved curves in methanol oxidation, suggesting an efficient electronic conduction mechanism from the substrate via CN x NTs to reach individual Pt NPs is in operation. Such an integrated nanocomposite approach possesses a high potential for micro direct methanol fuel cell applications. © 2005 American Chemical Society.
Other Subjects
Electrochemical properties;Electronic conduction;Microwave-plasma-enhanced chemical vapor deposition;Nanoclusters;Chemical bonds;Composite materials;Cyclic voltammetry;Electrochemistry;Growth (materials);Methanol;Microwaves;Oxidation;Plasma enhanced chemical vapor deposition;Platinum;Sputtering;Transmission electron microscopy;X ray diffraction analysis;X ray photoelectron spectroscopy;Carbon nanotubes
Type
journal article