2016年9月
Self-assembled diacetylene molecular wire polymerization on an insulating hexagonal boron nitride (0001) surface
NANOTECHNOLOGY
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- 巻
- 27
- 号
- 39
- 開始ページ
- 395303
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/0957-4484/27/39/395303
- 出版者・発行元
- IOP PUBLISHING LTD
The electrical characterization of single-polymer chains on a surface is an important step towards novel molecular device development. The main challenge is the lack of appropriate atomically flat insulating substrates for fabricating single-polymer chains. Here, using atomic force microscopy, we demonstrate that the (0001) surface of an insulating hexagonal boron nitride (h-BN) substrate leads to a flat-lying self-assembled monolayer of diacetylene compounds. The subsequent heating or ultraviolet irradiation can initiate an on-surface polymerization process leading to the formation of long polydiacetylene chains. The frequency of photo-polymerization occurrence on h-BN(0001) is two orders of magnitude higher than that on graphite(0001). This is explained by the enhanced lifetime of the molecular excited state, because relaxation via the h-BN is suppressed due to a large band gap. We also demonstrate that on-surface polymerization on h-BN(0001) is possible even after the lithography process, which opens up the possibility of further electrical investigations.
- リンク情報
- ID情報
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- DOI : 10.1088/0957-4484/27/39/395303
- ISSN : 0957-4484
- eISSN : 1361-6528
- PubMed ID : 27573286
- Web of Science ID : WOS:000412626900001