Natural and expandable graphites were chemically treated in acidic aqueous solutions such as acetic acid or mixtures of acetic acid and nitric acid. Structures and thermal conductivities of the as-treated graphites were characterized in detail. Both graphites were significantly oxidized in the mixed acidic solution of H2SO4 and HNO3, which condition was generally used for the oxidation of carbon nanotubes. This considerable oxidation of graphites caused a depression of their thermal conductivity. The structural characteristics, obtained by XRD and XPS, show that the graphites treated in the relatively weak acidic conditions (acetic acid or mixture of acetic acid and nitric acid) were quite similar to the untreated graphites. However, the thermal conductivities of both acidic-treated graphites were remarkably increased.

• 오원태(동의대학교 신소재공학과) | Weontae Oh Corresponding author
• 김정수(부산대학교병원 의생명R&D센터) | Jungsoo Kim
• 이동원(㈜솔루에타 연구소) | Dong Won Lee
• 민의홍(㈜솔루에타 연구소) | Eui Hong Min
• 송승원(동의대학교 신소재공학과) | Seung Won Song