STM Investigation of Large π-Conjugated Oligomers and Tetrahydrofuran Codeposited on Cu(111) by Pulse Injection
STM Investigation of Large π-Conjugated Oligomers and Tetrahydrofuran Codeposited on Cu(111) by Pulse Injection
复制标题
DOI：
10.1021/jp904169c
复制
发表时间：
2009-08-13
影响因子：
3.7
通讯作者：
v. Loehneysen, H.
中科院分区：
文献类型：
--
作者：
Leon, C. Perez;Suergers, C.;v. Loehneysen, H.
以四氢呋喃（THF）为溶剂，采用脉冲注入法在室温下在干净的Cu（111）衬底上沉积了噻吩和苯的π共轭低聚物C114H158O8S2Si2。扫描隧道显微镜测量在室温下的高真空表明，CHOSSi和THF分子共吸附在铜表面上。溶剂分子形成具有不同取向和域边界的有序结构，表明THF与基底存在强烈的相互作用。CHOSSi分子的单个和小簇随机分布在表面上，与溶剂分子没有明显的相关性。随后的去除溶剂的热处理引起CHOSSi低聚物的降解，其聚集形成分形纳米结构。
The pi-conjugated oligomer consisting of ethynyl interlinked thiophene and benzene subunits C114H158O8S2Si2 has been deposited on clean Cu(111) substrates at room temperature using the pulse-injection method with tetrahydrofuran (THF) as solvent. Scanning tunneling microscopy measurements in ultrahigh vacuum at room temperature demonstrate that the CHOSSi and THF molecules coadsorb on the copper surface. The solvent molecules form ordered structures with distinct orientations and domain boundaries, suggesting a strong interaction of THF with the substrate. Individual and small clusters of CHOSSi molecules appear randomly distributed on the surface with no apparent correlation with the solvent molecules. Subsequent thermal treatment removing the solvent causes a degradation of the CHOSSi oligomers which aggregate forming fractal nanostructures.