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![Page 1: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/1.jpg)
Marie Curie ActionsEarly Stage Researcher Training Network
Interdisciplinary Nanoscience Center (iNANO)Department of Physics and AstronomyUniversity of Aarhus (Denmark)
1st October 2007, Berlin
Nataliya Kalashnyk
Molecular Networks at Phase BoundariesMONET workshop
![Page 2: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/2.jpg)
“Self-assembly of Molecular Nano-Structures on Dielectric Substrates”
Brief Description of my PhD project
Growth of 1D metallic wires on the dielectric films by trapping evaporated metal atoms under the molecules (e.g. Lander molecules)
To apply principles of molecular self-assembly in combination with metal deposition to synthesize and investigate nanowires and molecule-electrode nano-contacts relevant for the “molecular electronics”
Goal:
Growth of ultrathin dielectric layer by thermal evaporation of NaCl on metallic substrates in UHV
Formation of 1D molecular wires by complementary A-B-A-B- interaction
Objectives:
![Page 3: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/3.jpg)
Herringbone reconstruction is preserved
Ultrathin NaCl(001) film covers step edge of the Au(111) in a “carpet”-like mode
The 1st NaCl layer, named 1 DL, consists of two monoatomic layers of NaCl
On top of 1 DL, the 2nd (2 ML) and 3rd (3 ML) monoatomic NaCl layers are formed
Au(111) NaCl(001)
Growth of NaCl on Au(111) substrate
![Page 4: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/4.jpg)
Growth of NaCl on Au(111) substrate
1st NaCl layer is doublelayer (1DL)
2nd NaCl layer is monolayer (2ML)
![Page 5: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/5.jpg)
Co-adsorption of CA and M on Au(111)
102 x 104 Å2
Typical ‘rosette motif’: CA:M=1:1,Obtained upon simultaneous deposition.
Hydrogen-bonded, Eb = 0.82 eV/molecule(6 O..H bonds, 3 N..H bonds)
Melamine (M)
Cyanuric Acid (CA) Rosette structure
![Page 6: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/6.jpg)
Au(111)
NaCl
CA:M=1:1 on Au(111)
Eb= 0.82 eV/mol.
NaCl (001) on Au (111)
0 22 44 66 88 110
-0.8
0.0
0.8
1.6
2.4
Heig
ht / Å
Length / Å
1.78 Å
CA1M1 structure on NaCl/Au(111)N. Kalashnyk, C. Bombis et al. manuscript in preparation
Self-assembly of CA and M on NaCl
![Page 7: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/7.jpg)
Molecular Self-assembly on NaCl/Au(111)
0 55 110 165 220 275
-1.5
0.0
1.5
3.0
4.5 SL1 SL2
Hei
ght /
Å
Length / Å
3.22 Å
1.3 Å1.44 Å
![Page 8: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/8.jpg)
Molecular Self-assembly on NaCl/Au(111)
0 50 100 150 200 2500.0
1.3
2.6
3.9
5.2
6.5
Hei
ght /
Å
Length / Å
2.37 Å
1.45 Å
![Page 9: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/9.jpg)
Molecular Self-assembly on NaCl/Au(111)
0 60 120 180 240 300-0.5
0.0
0.5
1.0
1.5
2.0
Heig
ht / Å
Length / Å
0.72 Å
CA structure on NaCl/Au(111)CA1M1 and NaCl islands on Au(111)
![Page 10: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/10.jpg)
Conclusions
NaCl growth on metallic substrates:
Growth of large NaCl islands with (100) orientation on Au(111) by thermal evaporation
The “1st layer“ consists of 2 NaCl layers The “2nd and 3rd layers” are NaCl monolayer.
Over gold step edges, NaCl presents a carpet like growth mode.
Molecular self-assembly on NaCl/Au(111):
CA and M have natural tendency to sit on Au(111) surfaces free of NaCl layers.
However, in several cases, it was clearly observed that CA and M are growing from step edges of NaCl on Au(111).
In some images, we notice that CA and M molecules are stabilized on top of NaCl/Au(111).
Stabilization of organic molecules on the insulating layer is achieved by the self-assembly approach.
![Page 11: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/11.jpg)
“Self-assembly of Molecular Nano-Structures on Dielectric Substrates”
Brief Description of my PhD project
Growth of 1D metallic wires on the dielectric films by trapping evaporated metal atoms under the molecules (e.g. Lander molecules)
To apply principles of molecular self-assembly in combination with metal deposition to synthesize and investigate nanowires and molecule-electrode nano-contacts relevant for the “molecular electronics”
Goal:
Growth of ultrathin dielectric layer by thermal evaporation of NaCl on metallic substrates in UHV
Formation of 1D molecular wires by complementary A-B-A-B- interaction
Objectives:
![Page 12: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/12.jpg)
On Cu(110)
Molecular moulding
Molecules from A. Gourdon, CNRS Toulouse
Self-assembly of Lander-type molecules
M. Yu, W. Xu et al. work in progress
![Page 13: Marie Curie Actions Early Stage Researcher Training Network Interdisciplinary Nanoscience Center (iNANO) Department of Physics and Astronomy University.](https://reader031.fdocuments.us/reader031/viewer/2022020117/56649d0c5503460f949dff7e/html5/thumbnails/13.jpg)
Self-assembly of Lander-type molecules
Molecular moulding on Au(111)NaCl (001) on Au (111)