Self-assembled rows of Ni porphyrin dimers on the Ag(111) surface.
The growth and ordering of 5-(10,15,20-triphenylporphyrinatonickel(ii))dimer (NiTPP-dimer) molecules on the Ag(111) surface have been investigated using scanning tunnelling microscopy/spectroscopy (STM/STS) and low-energy electron diffraction (LEED). At one monolayer (ML) coverage the NiTPP-dimer forms a well-ordered close-packed molecular layer in which the porphyrin molecules have a flat orientation with the molecular plane lying parallel to the substrate. STM and LEED data obtained from one monolayer of the NiTPP-dimer on the Ag(111) surface show the formation of three domains which grow along the main crystallographic directions of the substrate. Scanning tunnelling spectroscopy data obtained from the NiTPP-dimer on the Ag(111) surface show good agreement with optical band gap measurements and density functional theory calculations.
Krasnikov
Sergey A
SA
School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland. Sergey.Krasnikov@dcu.ie
Sergeeva
Natalia N
NN
Sergeeva
Yulia N
YN
Senge
Mathias O
MO
Cafolla
Attilio A
AA