Preparation of Carbon Nano-Materials Using Arc Discharge in Liquid
- PDF / 1,873,352 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 58 Downloads / 215 Views
B9.17.1
Preparation of Carbon Nano-Materials Using Arc Discharge in Liquid Y. Suda, H. Kawasaki, T. Ohshima, S. Nakashima, S. Kawazoe1) and T. Toma1) Department of Electrical Engineering, Sasebo National College of Technology Okishin 1-1, Sasebo, Nagasaki 857-1193, Japan 1) Japan Nanotech. Co. Ltd., Masuragahama 147-40, Omura, Nagasaki 856-0022, Japan
ABSTRACT Carbon nanomaterials have been prepared using a simple production method of pulsed arc discharge between pure graphite electrodes in liquid. High-resolution transmission electron microscopy observation revealed that two kinds of nanomaterials can be produced in liquid. One of them is powdery products floating on the water surface, and another one is bulky deposits sank down in the water bottom. Some of them have multi-walled carbon nanofibers. Mean diameter of the nanofibers was approximately 30 nm. Optical emission of C+(426.7nm), Hα(656.3nm), Hβ(486.1nm), Hγ(434.0nm), C2 swan bands and CO(457.1nm) can be observed in the arc discharge by using photonic multichannel spectral analyzer. These results indicate that the carbon nanomaterials have been produced by pulsed arc discharge in liquid. INTRODUCTION Nano size crystalline particles have attracted a great deal of attention in the industrial production and application for the past several years. In particular, carbon nanomaterials including fullerene molecules, carbon nanotubes, nanohorns and nanoonions are promising new materials for a variety of potential applications.. These carbon nanomaterials have been produced by various methods such as arc discharge in a buffer gas, laser ablation, chemical vapor deposition (CVD) and annealing of nanodiamonds. Among them, the arc discharge method is the most common and is widely used by many researchers and manufacturers. Recently, it has been demonstrated that carbon nanomaterials can be synthesized also by arc discharge generated in a liquid medium such as water [1–6] or liquid nitrogen [7]. The liquid arc discharge method, which does not require expensive vacuum equipment, is more economical than the conventional gas arc discharge method and may have some advantages in the mass production of carbon nanomaterials. In this paper, carbon nanoparticles have been deposited by pulsed arc discharge in liquid. Morphology, size and density of the particles are measured by high-resolution transmission electron microscopy. Measurements of optical emission spectra were performed to estimate the processing plasma state in liquid. EXPERIMENTAL A schematic of the pulsed arc discharge equipment is shown in Fig. 1. In our liquid arc
B9.17.2
discharge method, a direct current (DC) arc discharge was generated between two high purity carbon rod electrodes (purchased from Nilaco Corp., Japan; 99.99% purity). Our apparatus consisted of two electrodes (anode 5 × 50mm, and cathode 20 × 30 mm) in a vertical alignment submerged in 500 ml of deionized water (0.2 mS/m conductivity) or ethanol in a Pyrex beaker. These carbon electrodes were connected to a DC power supply. Arc discharge was
Data Loading...
