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Article Dans Une Revue Nanotechnology Année : 2016

Self-assembled diacetylene molecular wire polymerization on an insulating hexagonal boron nitride (0001) surface

Résumé

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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Dates et versions

hal-01712763 , version 1 (19-02-2018)

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Marina V. Makarova, Yuji Okawa, Elisseos Verveniotis, Kenji Watanabe, Takashi Taniguchi, et al.. Self-assembled diacetylene molecular wire polymerization on an insulating hexagonal boron nitride (0001) surface. Nanotechnology, 2016, 27 (39), pp.395303. ⟨10.1088/0957-4484/27/39/395303⟩. ⟨hal-01712763⟩
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