Scanning tunneling spectroscopy investigation of self-assembled plastocyanin mutants onto gold substrates under controlled environment

2004 ◽  
Vol 107 (2) ◽  
pp. 107-116 ◽  
Author(s):  
L. Andolfi ◽  
G.W. Canters ◽  
M.Ph. Verbeet ◽  
S. Cannistraro
Keyword(s):  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Controlled Environment ◽  
Gold Substrates ◽  
Self Assembled

Growth and scanning tunneling spectroscopy of self-assembled π-conjugated oligomers

1999 ◽  
Vol 8-9 ◽  
pp. 267-272 ◽  
Author(s):  
J.J.W.M. Rosink ◽  
M.A. Blauw ◽  
L.J. Geerligs ◽  
E. van der Drift ◽  
B.A.C. Rousseeuw ◽  
...  
Keyword(s):  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Conjugated Oligomers ◽  
Self Assembled

Preparation, Characterization, and Electrical Properties of a Self-Assembled meso-Pyridyl Porphyrin Monolayer on Gold Surfaces

2005 ◽  
Vol 58 (11) ◽  
pp. 810 ◽  
Author(s):  
Amarchand Sathyapalan ◽  
Anup Lohani ◽  
Sangita Santra ◽  
Saurabh Goyal ◽  
M. Ravikanth ◽  
...  
Keyword(s):  
Soret Band ◽  
Gold Surface ◽  
Scanning Tunneling Spectroscopy ◽  
Uv Absorption ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Force Microscopy ◽  
Gold Substrates ◽  
Assembled Monolayers ◽  
Self Assembled

A meso-pyridyl porphyrin, 5-(4-(2-(4-(S-acetylthiomethyl)phenyl)ethynyl)phenyl)-10,15,20-tris(4-pyridyl) porphyrin was synthesized by coupling of 5-{4-ethynyl}phenyl-10,15,20-tris(4-pyridyl) porphyrin with 4-(S-acetylthiomethyl)-4-iodobenzene under mild palladium coupling conditions. The meso-pyridyl porphyrin was used for the preparation of self assembled monolayers on gold substrates. The gold substrates were made by the thermal evaporation of gold on oxidized Si(100) surfaces. The self-assembled monolayers (SAMs) were characterized using ground state UV absorption and X-ray photoelectron spectroscopic (XPS) techniques and also by scanning probe microscopy (SPM) techniques. The UV-absorption spectra of the porphyrin monolayer exhibited a 10 nm red shift in the Soret band compared to the porphyrin in CHCl3 solution. This indicates that the porphyrin molecules are aligned on the gold substrate in a side-by-side orientation. The typical shifts in the binding energy by XPS revealed that the chemisorption of the thiolate species of the porphyrin to the surface occurs through a strong sulfur–gold bonding mechanism. Basic hexagonal (√3×√3) R 30° well ordered self-assembled monolayers of meso-pyridyl porphyrin was observed by molecular-resolution atomic force microscopy (AFM). Room temperature current–voltage (I–V) spectra by scanning tunneling spectroscopy (STS) at varying set point current were collected to study the electronic transport properties of the monolayers on the gold surface.

scholarly journals Scanning Tunneling Spectroscopy of Insulating Self-Assembled Monolayers on Au(111)

2002 ◽  
Vol 106 (34) ◽  
pp. 8721-8725 ◽  
Author(s):  
André P. Labonté ◽  
Steven L. Tripp ◽  
Ronald Reifenberger ◽  
Alexander Wei
Keyword(s):  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Assembled Monolayers ◽  
Self Assembled

scholarly journals Extended iron phthalocyanine islands self-assembled on a Ge(001):H surface

2021 ◽  
Vol 12 ◽  
pp. 232-241
Author(s):  
Rafal Zuzak ◽  
Marek Szymonski ◽  
Szymon Godlewski
Keyword(s):  
Detailed Analysis ◽  
Self Assembly ◽  
Surface Defects ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Iron Phthalocyanine ◽  
Germanium Surface ◽  
Self Assembled

Self-assembly of iron(II) phthalocyanine (FePc) molecules on a Ge(001):H surface results in monolayer islands extending over hundreds of nanometers and comprising upright-oriented entities. Scanning tunneling spectroscopy reveals a transport gap of 2.70 eV in agreement with other reports regarding isolated FePc molecules. Detailed analysis of single FePc molecules trapped at surface defects indicates that the molecules stay intact upon adsorption and can be manipulated away from surface defects onto a perfectly hydrogenated surface. This allows for their isolation from the germanium surface.

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