Journal
NANOTECHNOLOGY
Volume 27, Issue 39, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/39/395303
Keywords
molecular self-assembly; insulating substrate; molecular electronics; polydiacetylene; single-polymer chain
Funding
- World Premier International Research Center Initiative (WPI)
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- JSPS KAKENHI [24241047]
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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.
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