掃描穿隧顯微鏡研究有機分子（Co-TPP）在鉛／矽（111）表面的自組裝行為

Scanning Tunneling Microscope Study of Cobalt Tetraphenylporphyrin Self-assembly on Pb/Si(111) Surface

林榮君(Rung-Jiun Lin) ； 張仕欣(Shih-Hsin Chang) ； 林登松(Deng-Sung Lin) ； 傅祖怡(Tsu-Yi Fu)

《真空科技》 25卷4期 (2012/12) Pp. 33-39

https://doi.org/10.29808/JVSROC.201212.0006

摘要

利用低溫穿隧掃描顯微鏡研究有機分子（四苯基鈷卟啉；Co-TPP）在單層鉛薄膜於矽（111）表面上的自組裝行為。在室溫下沉積後，四苯基鈷卟啉分子具有不同的吸附配置，並形成短程有序的區域在具有（1 × 1）相或不相稱相（Incommensurate Phase; IC Phase）的鉛/矽（111）基底上。四重對稱的四苯基鈷卟啉在自組裝上依然會形成矩形的分子島，並且容易形成雙分子層的島。然而分子受到三重對稱的矽（111）基底所影響，分子島在排列上會符合基底的三個{11-2}方向。低溫時，第一層的分子會相變成兩種結構，這是因為當溫度低於250K時，鉛／矽（111）表面會相變為√7x√3的結構。而相變改變了表面的應力，導致分子型態變化。

關鍵字

掃描穿隧顯微鏡 ； 四苯基鈷卟啉 ； 鉛／矽（111）

並列摘要

Self-assembly of cobalt tetraphenylporphyrin (Co-TPP) molecules at a monolayer Pb-covered Si(111) surface are studied by low-temperature scanning tunneling microscope (LT-STM). Upon deposition at room temperature, the Co-TPP molecules with different adsorption configurations formed short-ranged ordered domains on (1 × 1) - Pb/Si(111) or incommensurate phase (IC) substrate. The self-assembly of molecules still form rectangular islands of the fourfold symmetry Co- TPP. The islands are often bilayer. However, the molecules arrangement affected by the threefold symmetry Si(111) substrate, and it make the islands corresponding to the three {0,1,-1} directions. At low temperature, the first layer of molecules of the island will have phase transformation to two type structures. Because the Pb/Si(111) surface have phase transformation to √7 x√3 domain as the temperature lower than 250 K, surface phase transition to change stress of the substrate may affect the molecular morphologies.

並列關鍵字

Scanning Tunneling Microscope ； Cobalt Tetraphenylporphyrin ； Pb/Si(111)