High Resolution Scanning Tunneling Microscopy of a 1D Coordination Polymer with Imidazole‐Based <i>N,N,O</i> Ligands on HOPG

Fischer, Nina V.; Mitra, Utpal; Warnick, Karl-Georg; Dremov, Viacheslav; Stöcker, Michael; Wölfle, Thorsten; Hieringer, Wolfgang; Heinemann, Frank W.; Burzlaff, Nicolai; Görling, Andreas; Müller, Paul

doi:10.1002/chem.201302379

Cited by 4 publications

(4 citation statements)

References 59 publications

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“…Current nano-device miniaturization is driving Si and Moore’s law to their limits. In search of materials for the electronics of the future, conjugated polymers [1,2,3] in general, and single electrically conductive molecular chains [4,5,6,7,8,9] in particular, have attracted considerable interest. Those chains, already utilized in transport measurements, will constitute the very core of molecular electronic circuits [8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Self-Sensitization and Photo-Polymerization of Diacetylene Molecules Self-Assembled on a Hexagonal-Boron Nitride Nanosheet

et al. 2018

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Long poly-diacetylene chains are excellent candidates for planar, on-surface synthesized molecular electronic wires. Since hexagonal-Boron Nitride (h-BN) was identified as the best available atomically flat insulator for the deposition of poly-diacetylene precursors, we demonstrate the polymerization patterns and rate on it under UV-light irradiation, with subsequent polymer identification by atomic force microscopy. The results on h-BN indicate self-sensitization which yields blocks comprised of several polymers, unlike on the well-studied graphite/diacetylene system, where the polymers are always isolated. In addition, the photo-polymerization proceeds at least 170 times faster on h-BN, where it also results in longer polymers. Both effects are explained by the h-BN bandgap, which is larger than the diacetylene electronic excitation energy, thus allowing the transfer of excess energy absorbed by polymerized wires to adjacent monomers, triggering their polymerization. This work sets the stage for conductance measurements of single molecular poly-diacetylene wires on h-BN.

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Section: Introductionmentioning

confidence: 99%

Self-Sensitization and Photo-Polymerization of Diacetylene Molecules Self-Assembled on a Hexagonal-Boron Nitride Nanosheet

et al. 2018

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“…After substrate preparation, the diacetylene molecules were deposited on them by (1) spin-coating at 8000 rpm immediately after dropcasting a 4 ml droplet (on h-BN) or (2) dropcasting a 4 ml droplet and blow drying by N 2 gas (on all other substrates).…”

Section: Methodsmentioning

confidence: 99%

“…Progress in electronic nano-device miniaturization attracted considerable interest for single conductive molecular chains [1][2][3][4][5][6] which are already utilized for transport measurements and are expected to be integral in the fabrication of molecular electronic devices. [5][6][7][8][9][10] On-surface synthesis of molecular chains has been recently performed on clean metallic surfaces in an ultra-high vacuum and at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Self-assembling diacetylene molecules on atomically flat insulators

Verveniotis

Okawa

Makarova

et al. 2016

Phys. Chem. Chem. Phys.

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Single crystal sapphire and diamond surfaces are used as planar, atomically flat insulating surfaces, for the deposition of the diacetylene compound 10,12-nonacosadiynoic acid. The surface assembly is compared with results on hexagonal boron nitride (h-BN), highly oriented pyrolytic graphite (HOPG) and MoS surfaces. A perfectly flat-lying monolayer of 10,12-nonacosadiynoic acid self-assembles on h-BN like on HOPG and MoS. On sapphire and oxidized diamond surfaces, we observed assemblies of standing-up molecular layers. Surface assembly is driven by surface electrostatic dipoles. Surface polarity is partially controlled using a hydrogenated diamond surface or totally screened by the deposition of a graphene layer on the sapphire surface. This results in a perfectly flat and organized SAM on graphene, which is ready for on-surface polymerization of long and isolated molecular wires under ambient conditions.

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“…The consistent progress in nanotechnology and device miniaturization initiated considerable interest in single conductive polymer chains [1][2][3][4][5][6][7][8]. Such chains provide long molecular wires for studies of the electronic transport properties of rather flexible one-dimensional systems.…”

Section: Introductionmentioning

confidence: 99%

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

Makarova¹,

Okawa

Verveniotis

et al. 2016

Nanotechnology

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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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High Resolution Scanning Tunneling Microscopy of a 1D Coordination Polymer with Imidazole‐Based N,N,O Ligands on HOPG

Cited by 4 publications

References 59 publications

Self-Sensitization and Photo-Polymerization of Diacetylene Molecules Self-Assembled on a Hexagonal-Boron Nitride Nanosheet

Self-Sensitization and Photo-Polymerization of Diacetylene Molecules Self-Assembled on a Hexagonal-Boron Nitride Nanosheet

Self-assembling diacetylene molecules on atomically flat insulators

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

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