在金（111）衬底上对寡聚噻吩吸附层替代效应的扫描隧道显微镜研究。

STM investigation of substitute effect on oligothiophene adlayer at Au(111) substrate.

作者信息

Wang Ling, Yan Hui-Juan, Wan Li-Jun

机构信息

Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.

出版信息

J Nanosci Nanotechnol. 2007 Sep;7(9):3111-6. doi: 10.1166/jnn.2007.690.

DOI:10.1166/jnn.2007.690

PMID:18019136

Abstract

Molecular adlayers of a series of oligothiophenes with carboxylic groups and alkyl substitutes, DTDA, TTDA, QTDA, and PTDA, are investigated by STM at Au(111) surface. The effect of molecular structure including alkyl chain and thiophene backbone on the adlayer structure is revealed. DTDA and TTDA with two and three thiophene rings, self-assembled into highly ordered long-range two dimensional structures via hydrogen bondings, while QTDA with four thiophene rings formed short-range ordered structure with hexagonal symmetry. PTDA with five thiophene rings showed disordered pattern due to its strong molecule-substrate interaction. The results are compared with those on HOPG surface, showing that the molecule-substrate interaction plays an important role in the adlayer formation of these oligothiophenes.

摘要

通过扫描隧道显微镜（STM）在金（111）表面研究了一系列带有羧基和烷基取代基的低聚噻吩分子层，包括DTDA、TTDA、QTDA和PTDA。揭示了包括烷基链和噻吩主链在内的分子结构对吸附层结构的影响。具有两个和三个噻吩环的DTDA和TTDA通过氢键自组装成高度有序的长程二维结构，而具有四个噻吩环的QTDA形成具有六边形对称性的短程有序结构。具有五个噻吩环的PTDA由于其强烈的分子-基底相互作用而呈现无序图案。将结果与在高定向热解石墨（HOPG）表面的结果进行比较，表明分子-基底相互作用在这些低聚噻吩的吸附层形成中起重要作用。