Scanning Tunneling Microscopic Observation of Adsorbed Polymer Chains

利用扫描隧道显微镜（STM）观察了几种吸附或沉积在石墨表面的聚合物的分子形状和构象。将碘掺杂聚（n -乙烯基咔唑）（PVCZ）作为一种柔性聚合物沉积在石墨上，可以观察到PVCZ的整体形状。观察到的扩散形状与理论预测的孤立吸附链的形状相一致。可以观察到DNA的双螺旋结构，然后尝试对直链淀粉分子的单螺旋结构进行STM观察。可以观察到分离的单螺旋直链淀粉分子，其长度与分子大小相对应，螺旋间距与晶体结构相对应。对胶凝聚电解质kappa- carragean的STM观察也进行了挑战，我们不仅可以观察到carragean分子的螺旋结构，还可以观察到carragean凝胶的结区。

Molecular shape and conformations of several polymers adsorbed or deposited on graphite surfaces were observed by a scanning tunneling microscope (STM). Iodine doped poly (N-vinylcarbazole) (PVCZ) which is a flexible polymer was deposited on the graphite and global shapes of PVCZ could be observed. The observed spread shape corresponded to the theoretically predicted shape for an isolated adsorbed chain.Double helix conformation of DNA could be observed and then STM observation of single helical structure of amylose molecules was attempted. Isolated single helical amylose molecules could be observed, whose length corresponds to molecular size and the pitch of helix corresponds to crystalline structure. The STM observation of kappa-carrageenan, which is a gel forming polyelectrolyte was also challenged, and we could succeed to observe not only helical structure of carrageenan molecule but also the junction zones of carrageenan gels.