高定向热解石墨表面超大结构的扫描隧道显微镜研究

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2.4~5.7 nm,峰与峰之间的距离为1.0~3.8,相对于HOPG表面的原子结构转动30°角.推测这种超大结构是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.     

In situ AFM observation of BSA adsorption on HOPG with nanobubble

Nanobubbles have been proven existent at the liquid/solid interface, and become a focus of research on varied interfacial processes. In the present work, by observing in situ with atomic force microscope (AFM), we found that nanobubbles could influence the adsorption process of bovine serum albumin (BSA) on hydrophobic surface of highly ordered pyrolytic graphite (HOPG). BSA could adsorb evenly, and coexist with nanobubbles at water/HOPG interface. After removing nanobubbles by injecting ethanol, some hollows were found in the BSA layers at the same positions of nanobubbles existing previously. These hollows were about 8 nm in depth and dozens of nanometers in diameter. The correlation coefficient between the areas of nanobubbles and that of the corresponding hollows reached 0.88―0.94, which strongly supported the assumption that the hollows were indeed caused by the nanobubbles. Moreover, the BSA molecules formed rings around the nanobubbles, suggesting the preference of BSA adsorption onto the contact line at water/HOPG interface.     

Direct observation of monomer film structure of bacteriochlorophyll <Emphasis Type="Italic">c</Emphasis>

The adsorption and assembling of bacteriochlorophyll c (BChl c) on a highly oriented pyrolytic graphite (HOPG) surface have been investigated by the scanning tunneling microscopy (STM). BChl c molecules are found to self-organize a well-defined adlayer on HOPG surface with a monomeric structure different from the dimer association seen on adlayers of Chls a, c and BChlide c, d. A structural model is proposed for the adlayer.     

Direct observation of monomer film structure of bacteriochlorophyll c

The adsorption and assembling of bacteriochlorophyll c (BChl c) on a highly oriented pyrolytic graphite (HOPG) surface have been investigated by the scanning tunneling microscopy (STM). BChl c molecules are found to self-organize a well-defined adlayer on HOPG surface with a monomeric structure different from the dimer association seen on adlayers of Chls a, c and BChlide c, d. A structural model is proposed for the adlayer.     

高取向热解石墨纳米孔的制备、控制及纳米结构的模板合成

高取向热解石墨（HOPG）单层及多层纳米可作为结构模板合成金属或半导体纳米结构。本文介绍了作者最近有关用高聚焦离子束轰击和热氧化法在HOPG上制备大小、深度（单层、多层）、密度可控的纳米孔,以及控制纳米孔的形成位置制备周期性的纳米孔有序阵列等工作。并对用HOPG纳米孔作为结构模板合成金属或半导体纳米结构及其有序阵列体系也作了介绍。