Regensburg 2022 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 24: New Methods and Developments: Spectroscopies, Diffraction and Others (joint session O/KFM)
KFM 24.7: Vortrag
Donnerstag, 8. September 2022, 12:15–12:30, H6
On-surface GNR fabrication via electrospray deposition of monomers and polymers from solution — •Felix Baier1, Christoph Dobner1, Michael Beckstein1, Mamun Sarker2, Alexander Sinitskii2, and Axel Enders1 — 1Universität Bayreuth — 2University of Nebraska - Lincoln, USA
Strategies for depositing large organic molecules such as proteins, DNA or graphene nanoribbons (GNRs) are urgently needed because the conventional method of evaporation is impossible due to the size of the molecules. GNRs prepared in solution are of particular interest because they are longer compared to those synthesized on the surface and can be produced in large quantities. Since GNRs form crystallites, they cannot be brought onto the surface by direct contact printing and characterized using STM. Therefore, a new electrospray setup was developed for the deposition of GNR precursor molecules, large precursor polymers, and GNR from a solution. The instrument consists of a heatable stainless steel capillary to which a high voltage in the range -8 to 8 kV, with respect to the sample can be applied. The assembly is placed in a glovebox which ensures the cleanliness of the working process. The characterization of the deposits was done with STM under ultra high vacuum after sample transfer. The deposition of TPTP monomers from solution onto Au(111) brought comparable results as other, established approaches were cGNR were formed after direct contact printing in UHV. Larger polymers were also deposited and completely cyclized on the surface after deposition, forming promising GNRs that have not been studied anywhere before.