Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Molecular Electronics and Photonics
TT 24.9: Vortrag
Dienstag, 2. April 2019, 11:45–12:00, H22
On surface formation of 1D polyferrocenylene chains on metal surfaces with unique structural and electronic properties — •Vijai Meena Santhini1, Oleksandr Stetsovych1, Martin Ondracek1, Martin Svec1, Jesus Mendieta1, Bruno De La Torre1,3, Irena G.Stara2, Ivo Stary2, Radek Zboril3, and Pavel Jelenik1 — 1Institute of Physics, Czech Academy of Sciences, Praha, Czech Republic — 2Institute of Chemistry and Biochemistry, Czech Academy of Sciences, Praha, Czech Republic — 3Regional Centre of Advanced Materials and Technologies, Olomouc, Czech Republic
We present a novel way of generation of long flexible 1D polyferrocenylene chains on metal surface with lengths up to 50 nm, representing the longest homo-coupled polyferrocenylene up to our knowledge. We employ on surface Ullman coupling polymerization of 1,1*-diiodobiferrocene molecules, deposited at room temperature under ultra-high vacuum conditions. The product are analysed using the low temperature scanning tunnelling microscope/atomic force microscopy (LT-STM/AFM). We observe two distinct 2D well-ordered polymer islands after annealing, with different electronic structure, due to the different packing of 1D molecular nanowires within the islands. We identified the internal molecular arrangement of island with help of high-resolution STM/AFM imaging with functionalized tips. We also succeeded in pulling out the 1D PFc chains from the islands to form free-standing 1D chains. We have identified a transition in the electronic behaviour, from semiconducting polymer 2D islands to metallic 1D chains using scanning tunneling spectroscopy.