Paper NS-ThP4
An New One-step Synthesis Method for Generating Nanocarbon-supported Metal Nanoparticle
Thursday, November 1, 2012, 6:00 pm, Room Central Hall
| Session: |
Nanometer-scale Science and Technology Poster Session |
| Presenter: |
J. Kang, Nagoya University, Japan |
| Authors: |
J. Kang, Nagoya University, Japan
L. Li, Nagoya University, Japan
N. Zettsu, Nagoya University, Japan
O. Takai, Nagoya University, Japan
N. Saito, Nagoya University, Japan
|
| Correspondent: |
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Introduction
Metal nanoparticles attract sustained attention due to their application in electrocatalysis for cell. Recently, many loading methods of nanoparticles on carbon material such as chemical reductions, electrochemical reductions, sol–gel polymerization and ultrasonic vibration have been reported for the generation of cell electrode. However, these methods generally require either reducing agent to reduce metal ions or removal of residues from the solution dispersed nanoparticles and it’s dispersibility and loading amount is poor. To supplement these weaknesses, in this study, the Au, Ag, Pt, Au-Pt bimetallic alloyed nanoparticles were synthesized simultaneously with carbon nanoball (Au, Ag, Pt, Au-Pt/CNB) by our progressive method, Solution Plasma Process (SPP).
Experimental Procedures
Highly porous CNBs were synthesized from 200 ml of organic. The glow discharge in solution was produced by using a bipolar pulsed power supply operated at 1.6 kV of voltage, 15 kHz of pulse frequency, 0.7ms of pulse width, and 0.3 mm electrode distance, respectively and then NPs/CNB were annealed for improvement conductivity of CNB. The nanoparticle/carbon nanoball (NPs/CNB) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM) Brunauer–Emmett–Teller (BET) method and cyclic voltammetry (CV)
Results and Discussion
Approximately 500mg of CNB were generated by SPP of 200ml of organic solution in 15 minute process time. As evaluated by SEM, the diameters of CNB were in a range of 20 nm to 30nm and it showed that these carbon spheres have a ball-like and chain-like morphology, accompanied with a quite uniform diameter. The Scanning Transmission Electron Microscopy (STEM) image showed that the 1~2 nm diameter of Au, Pt, Au-Pt bimetallic alloyed nanoparticles were deposited on all of CNB with high loading and dispersion. The BET surface area and the pore volume of as obtained CNB were respectively, 120~130 m2/g and 0.8~0.9 cm3/g. The average pore size could be estimated approximately as 20~25nm. Subsequent heating of the CNB at 850℃ for 30 minutes under an Ar environment encouraged the increase of the BET surface area and pore volume of CNB to 250~300 m2/g and 1.1~1.3 cm3/g respectively. The average pore size was calculated around 15~16nm. These results strongly suggested that our newly developed process of NPs/CNB synthesis might be a potential method for a single-step production of nanocarbon-supported metal nanoparticle.