Scanning tunnelling microscopy investigations of self-assembled monolayers of poly(3-decyl-thiophene) on graphite

1993 ◽  
Vol 2 (6) ◽  
pp. 295-299 ◽  
Author(s):  
Annalisa Bonfiglio ◽  
Rita Paradiso ◽  
Ermanno Di Zitti ◽  
Davide Ricci ◽  
Alberto Bolognesi ◽  
...  
Keyword(s):  
Scanning Tunnelling Microscopy ◽  
Self Assembled Monolayers ◽  
Scanning Tunnelling ◽  
Assembled Monolayers ◽  
Tunnelling Microscopy ◽  
Self Assembled

scholarly journals STM visualisation of counterions and the effect of charges on self-assembled monolayers of macrocycles

2011 ◽  
Vol 2 ◽  
pp. 674-680 ◽  
Author(s):  
Tibor Kudernac ◽  
Natalia Shabelina ◽  
Wael Mamdouh ◽  
Sigurd Höger ◽  
Steven De Feyter
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Self Assembled Monolayers ◽  
Assembly Process ◽  
Organic Monolayers ◽  
Preferential Adsorption ◽  
Scanning Tunnelling ◽  
Assembled Monolayers ◽  
Tunnelling Microscopy ◽  
Self Assembled

Despite their importance in self-assembly processes, the influence of charged counterions on the geometry of self-assembled organic monolayers and their direct localisation within the monolayers has been given little attention. Recently, various examples of self-assembled monolayers composed of charged molecules on surfaces have been reported, but no effort has been made to prove the presence of counterions within the monolayer. Here we show that visualisation and exact localisation of counterions within self-assembled monolayers can be achieved with scanning tunnelling microscopy (STM). The presence of charges on the studied shape-persistent macrocycles is shown to have a profound effect on the self-assembly process at the liquid–solid interface. Furthermore, preferential adsorption was observed for the uncharged analogue of the macrocycle on a surface.

scholarly journals Thiocyanate Anchors for Salt-like Iron(II) Complexes on Au(111): Promises and Caveats

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1164-1180 ◽  
Author(s):  
Philipp Stock ◽  
Andreas Erbe ◽  
Manfred Buck ◽  
Dennis Wiedemann ◽  
Hervé Ménard ◽  
...  
Keyword(s):  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Sulphur Atom ◽  
X Ray ◽  
New Class ◽  
Scanning Tunnelling ◽  
Assembled Monolayers ◽  
Tunnelling Microscopy ◽  
Self Assembled ◽  
Ionic Iron

Abstract The formation of self-assembled monolayers (SAMs) on Au(111) from solution has been investigated for two ionic iron(II) complexes of the type [Fe(L)](BF4)2, where L is tripodal hexadentate and contains three thiocyanate anchor groups. The ligands (L1, L2; donor set: N6) are obtained by Schiff base condensation of a tripodal triamine (L1: tris-(2-aminoethyl)amine, ‘tren’; L2: 1,1′,1″- trimethyl(thiophosphoryl)trihydrazide) with 5-(4-thiocyanatobutoxy) pyridine-2-carbaldehyde. Layers of the complexes adsorbed on Au(111) from methanol solution have been characterised using scanning tunnelling microscopy (STM), infrared reflectance absorbance (IRRAS), X-ray photoelectron (XPS) and UV=Vis reflectance spectroscopies, as well as ellipsometry. Complex [Fe(L1)](BF4)2 deposits intact on a gold surface and retains its optical addressability. Elaboration of this result may provide access to a new class of self-assembled layers, employing salt-like tripodal coordination compounds with thiocyanate anchors. The second complex, [Fe(L2)](BF4)2, which contains a sulphur atom in the ligand backbone, is not sufficiently stable under the same conditions.

Highlighting functional groups in self-assembled overlayers with specific functionalized scanning tunnelling microscopy tips

2005 ◽  
Vol 16 (11) ◽  
pp. 2596-2600 ◽  
Author(s):  
Cedric Volcke ◽  
Priscilla Simonis ◽  
Paul A Thiry ◽  
Philippe Lambin ◽  
Christine Culot ◽  
...  
Keyword(s):  
Functional Groups ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Self Assembled

Shape Transitions of Self-Assembled Ge Islands on Si(001)

2001 ◽  
Vol 707 ◽  
Author(s):  
Armando Rastelli ◽  
Matthias Kummer ◽  
Hans Von Känel
Keyword(s):  
Substrate Temperature ◽  
Morphological Changes ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Magnetron Sputter ◽  
Self Assembled ◽  
Shape Changes ◽  
Stable Shape ◽  
Shape Transitions

ABSTRACTCoherently strained Ge islands were grown at a substrate temperature of 550°C by magnetron sputter epitaxy on Si (001) and studied by scanning tunnelling microscopy (STM). The shape changes induced by exposure to a Si-flux at 450°C were investigated as a function of the Si-coverage. During Si-capping, multifaceted domes were found to flatten and to transform into {105}-faceted pyramids and subsequently into stepped mounds through intermediate shapes. The observed sequence of morphological changes is induced by Si-Ge intermixing and is shown to be the inverse of that occurring during Ge or Si1-xGex growth on Si (001). The results are interpreted with a model in which the stable shape of an island mainly depends on its volume and composition.

Shape Transitions of Self-Assembled Ge Islands on Si (001)

2001 ◽  
Vol 696 ◽  
Author(s):  
Armando Rastelli ◽  
Matthias Kummer ◽  
Hans von Känel
Keyword(s):  
Substrate Temperature ◽  
Morphological Changes ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Magnetron Sputter ◽  
Self Assembled ◽  
Shape Changes ◽  
Stable Shape ◽  
Shape Transitions

AbstractCoherently strained Ge islands were grown at a substrate temperature of 550°C by magnetron sputter epitaxy on Si (001) and studied by scanning tunnelling microscopy (STM). The shape changes induced by exposure to a Si-flux at 450°C were investigated as a function of the Sicoverage. During Si-capping, multifaceted domes were found to flatten and to transform into {105}-faceted pyramids and subsequently into stepped mounds through intermediate shapes. The observed sequence of morphological changes is induced by Si-Ge intermixing and is shown to be the inverse of that occurring during Ge or Si1-xGex growth on Si (001). The results are interpreted with a model in which the stable shape of an island mainly depends on its volume and composition.

scholarly journals Probing functional self-assembled molecular architectures with solution/solid scanning tunnelling microscopy

2018 ◽  
Vol 54 (75) ◽  
pp. 10527-10539 ◽  
Author(s):  
Daling Cui ◽  
Jennifer M. MacLeod ◽  
Federico Rosei
Keyword(s):  
Molecular Recognition ◽  
Small Molecule ◽  
2D Materials ◽  
Scanning Tunnelling Microscopy ◽  
Use Of Self ◽  
Practical Applications ◽  
Molecular Systems ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Self Assembled

STM is emerging as a tool to elucidate and guide the use of self-assembled molecular systems in practical applications, including small molecule device engineering, molecular recognition and sensing and electronic modification of 2D materials.

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