Haitao LiuUniversity of Pittsburgh, USA
Dr. Haitao Liu graduated in 2001with a bachelor's degree in chemistry from the University of Science and Technology of China (Hefei, China). He was a graduate student at the University of California, Berkeley, in the group of Professor A. Paul Alivisatos and obtained his PhD in chemistry in 2007. He then carried out postdoctoral research at Columbia University with Professor Louis Brus and Professor Colin Nuckolls. Since 2010, he has been a faculty member in the chemistry department of the University of Pittsburgh. His research interests include (i) surface chemistry of graphitic carbon; (ii) DNA-based nanofabrication; and (iii) reaction mechanism of the synthesis of inorganic colloidal nanocrystals. He has published over 50 peer reviewed journal articles in these areas, including several in Science, Nature Materials, and J. Am. Chem. Soc.
Title：On the intrinsic wettability of graphene
SymposiumA3 Other 2D Materials
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Abstract
It is generally accepted that graphitic surfaces, such as supported graphene and graphite, are hydrophobic and their water contact angles (WCAs) are in the range of 80° - 90°. In this talk, I will show that freshly prepared Cu-supported graphene and graphite surfaces are in fact hydrophilic with a WCA of ca. 44° and 64°, respectively [1]. The WCA of these surfaces increase when they are exposed to ambient air. By using infrared spectroscopy and X-ray photoelectron spectroscopy we demonstrate that airborne hydrocarbons adsorb on graphitic surfaces, and that a concurrent decrease in the WCA occurs when these contaminants are partially removed. Our findings indicate that graphitic surfaces are more hydrophilic than previously believed, and suggest that previously reported data on the wettability of graphitic surfaces may have been affected by unintentional hydrocarbon contamination from ambient air.
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