Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (50권2호 108-113)

Effect of Graphite Electrode Geometry and Combination on Nanocarbon Synthesis using Underwater Discharge Plasma

수중 방전 플라즈마를 이용한 탄소나노소재 합성 시 흑연전극의 형상과 조합의 영향

조성일;이병주;정구환;
Jo, Sung-Il;Lee, Byeong-Joo;Jeong, Goo-Hwan;

강원대학교 대학원 신소재공학과;강원대학교 대학원 신소재공학과강원대학교 공과대학 나노응용공학과;
Department of Advanced Materials Science and Engineering, Graduate School of Kangwon National University;

DOI : 10.5695/JKISE.2017.50.2.108

Abstract

We investigated the effect of graphite electrode geometry and combination on nanocarbon material synthesis using underwater discharge plasma(UDP). The UDP system consists of two graphite electrodes and beaker filled with de-ionized water. A high voltage of 15 kV with a frequency of 25 kHz is applied to produce UDP using an alternating-current power source. The UDP system with conical electrodes produced the largest amount of products due to the concentration of electrical fields between electrodes. In addition, hollow-shaped stationary electrode and conical-shaped moving electrode stores discharge-induced bubbles and maintains longer reaction time. We found from Raman spectroscopy and electron microscopy that high quality carbon nanomaterials including carbon nanotubes are synthesized by the UDP system.

Keywords

Underwater discharge plasma;Nanocarbon synthesis;Graphite electrode;Electrode geometry;Electrode configuration;Raman scattering spectroscopy;