高定向热解石墨表面超大结构的扫描隧道显微镜研究

Superperiodic Structures of Highly Oriented Pyrolytic Graphite Observed by Scanning Tunneling Microscopy

用扫描隧道显微镜（STM）对高定向热解石墨（HOPG）表面的超大结构进行了研究，观察到的超大结构是2．4～5．7mn，峰与峰之间的距离为1．0～3．8A^°，相对于HOPG表面的原子结构转动30°角．推测这种超大结构足由于电解质和溶剂小分子嵌入HOPG表面层所引起层间相互作用改变引起的表面电子态变化．

The superperiodic structures of highly oriented pyrolytic graphite （HOPG） have been observed by scanning tunneling microscopic （STM）. This supetperiodie structure had a spacing ranging from 2.4 to 5.7 nm with peak-to-peak amplitudes out of plane extending from 1.0 to 3.8 A^°, and an orientation of about 30~ with respect to the atomic corrugation. We proposed that this might be due to the graphite interlayer rotational alignment caused by the intercalation of electrolytes and solvents into the base plane of HOPG surface.