Abstract
We have developed a method of forming platinum (Pt) nanoparticles using a metal organic chemical fluid deposition (MOCFD) process employing a supercritical fluid (SCF), and have demonstrated the synthesis of dispersed Pt nanoparticles on the surfaces of carbon nanowalls (CNWs), two-dimensional carbon nanostructures, and carbon nanotubes (CNTs). By using SCF-MOCFD with supercritical carbon dioxide as a solvent of metal-organic compounds, highly dispersed Pt nanoparticles of 2 nm diameter were deposited on the entire surface of CNWs and CNTs. The SCF-MOCFD process proved to be effective for the synthesis of Pt nanoparticles on the entire surface of intricate carbon nanostructures with narrow interspaces.
Highlights
Graphite-related materials have long been a subject of interest to researchers
Magnified transmission electron microscopy (TEM) images of carbon nanowalls (CNWs) near the top and middle positions are shown in Figures 5(c) and 5(d)
We have developed a new method of deposition using supercritical carbon dioxide to treat the entire surface of carbon nanostructures
Summary
Graphite-related materials have long been a subject of interest to researchers. Since the first report of carbon nanotubes (CNTs) by Iijima [1], the fabrication of carbon nanostructures has been studied intensively. One-dimensional carbon nanostructures, such as carbon nanotubes and carbon nanofibers, have attracted significant interest for applications such as electrochemical devices, electron field. Layered graphene sheets can form two-dimensional carbon nanostructures with edges, called carbon nanowalls (CNWs), carbon nanosheets or carbon nanoflakes. The sheets form a wall structure with thicknesses in the range from a few nanometers to few tens of nanometers, and with a high aspect ratio (Figures 1 and 2). Their high aspect ratio and high surface-to-volume ratio are potentially useful as electron field emitters [8,9,10] and as catalyst supports [11]. It is expected that metal nanoparticles supported on the surfaces of carbon nanostructures will improve their electrical properties, and electrocatalyst/carbon nanostructure composites can be applied as electrochemical devices [11]
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