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.

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

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

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.

scholarly journals Real-space subfemtosecond imaging of quantum electronic coherences in molecules

2021 ◽  
Author(s):  
M. Garg ◽  
A. Martin-Jimenez ◽  
M. Pisarra ◽  
Y. Luo ◽  
F. Martín ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser Pulses ◽  
Real Space ◽  
Scanning Tunnelling Microscopy ◽  
Chemical Transformations ◽  
Molecular Systems ◽  
Quantum Electronic ◽  
Valence Electron Density ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

AbstractTracking electron motion in molecules is the key to understanding and controlling chemical transformations. Contemporary techniques in attosecond science are able to generate and trace the consequences of this motion in real time, but not in real space. Scanning tunnelling microscopy, on the other hand, can locally probe the valence electron density in molecules, but cannot alone provide dynamical information at this ultrafast timescale. Here we show that, by combining scanning tunnelling microscopy and attosecond technologies, quantum electronic coherences induced in molecules by <6-fs-long carrier-envelope-phase-stable near-infrared laser pulses can be directly visualized at ångström-scale spatial and subfemtosecond temporal resolutions. We demonstrate concurrent real-space and -time imaging of coherences involving the valence orbitals of perylenetetracarboxylic dianhydride molecules, and full control over the population of the involved orbitals. This approach opens the way to the unambiguous observation and manipulation of electron dynamics in complex molecular systems.

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.

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