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Molecular assemblies grown between metallic contacts on insulating surfaces
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/content/aip/journal/apl/94/6/10.1063/1.3080614
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Image of FIG. 1.

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FIG. 1.

nc-AFM measurements of cyanoporphyrin wires on Au decorated KBr. (a) shows a scan with various wires along the substrate direction. The inset shows the molecular structure (Ref. 3). (b) gives a closer look of the bottom region marked by a black frame in (a). The lower two images show the (c) topography and (d) the LCPD images of the molecular assembly formed between two Au clusters marked in (b). For contrast enhancement, the phase signal of the topography was added to (c). Parameters for all images are: , , , , , [(a) and (b)] , and [(c) and (d)] .

Image of FIG. 2.

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FIG. 2.

(a) Topography and (b) LCPD images of the interface between molecules and Au nanocluster. The image size is and the measurement was taken at with an amplitude of . For contrast enhancement the derivative of the topography was added to (a). The inset of (a) shows the dissipation signal ranging up to 1.6 eV at certain brighter areas above the molecular structure.

Image of FIG. 3.

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FIG. 3.

Histograms of the LCPD image presented in Fig. 2(b). The histograms of the localized areas contain . A clear difference in the surface potential between the different materials is observed.

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/content/aip/journal/apl/94/6/10.1063/1.3080614
2009-02-10
2014-04-16

Abstract

Contacting single molecules and molecular assemblies and determining optoelectronic properties is one of the most challenging topics in the field of molecular electronics. According to this purpose, the contacting of one- and two-dimensional molecular assemblies of asymmetric cyanoporphyrins and Aunanoclusters was developed. Furthermore, Kelvin probe force microscopy gives the opportunity to access electronicproperties of the molecular assemblies and to distinguish the molecules from Au nanocontacts. The change in the dipole moment density related to geometrical changes within a molecular wire contacted by two Aunanoclusters on a KBr single crystal substrate is observed and analyzed.

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Scitation: Molecular assemblies grown between metallic contacts on insulating surfaces
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/6/10.1063/1.3080614
10.1063/1.3080614
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