STM觀察液晶分子在表面的結構

Scanning Tunneling Microscopy Analysis of Liquid Crystal on Surfaces

許慶龍(Chinq-Long Sheu) ； 王修璇(Hsine-Hsyan Wang) ； 吳俊志(Jun.Jzih Wu) ； 蘇昭瑾(Chaochin Su)

《化學》 59卷2期 (2001/06) Pp. 133-142

https://doi.org/10.6623/chem.2001018

摘要

掃描式穿隧電子顯微鏡(STM)可以有原子或分子級的解析能力，單以液晶分子的化學資訊而言，對於吸附在基材表面的液晶分子結構、幾何形狀及大小、組成的官能基等，都可以利用STM觀察以達到分子般的辨識效果。此外，使用STM觀察液晶，還可以探討液晶相轉移與表面結構的相關性及液晶分子在表面上自我組合排列的方向性及秩序度。本篇報導的主要目的是介紹STM對液晶分子在表面上結構分析的應用及目前一些成功的例子。

關鍵字

掃描式穿隧電子顯微鏡(STM) ； 液晶(liquid crystals) ； 表面結構(surface structure)

並列摘要

Scanning tunneling microscopy (STM) with the capability of atomic resolution can be used to image the molecules on the surfaces. For the liquid crystal (LC) molecules, the substantial substrateadsorbate interaction results in the formation of highly ordered molecular phases at the surfaces of graphite (HOPG) and molybdenum disulfide (MoS_2). STM has been demonstrated to successfully resolve the individual LC molecules, and can even resolve the different functional groups within the molecules as well as their arrangement on the surface. The geometry and orderness of LC molecules self-assembled on surface observed by STM are also correlated with bulk phase transition. The purpose of this article is to introduce the application of STM in structure analysis of rod-like LC molecules on the surface. Several successful examples are also reviewed.

並列關鍵字

STM ； liquid crystals ； surface structure