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Organic molecular line and preparation method

A technology of organic molecules and molecular wires, which is applied in the field of preparing ordered tetrathiafulvalene or derivative molecular wires on the surface of high-temperature pyrolytic graphite, achieving the effects of simple process, low cost and good electrical properties

Inactive Publication Date: 2012-11-21
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are no reports in the literature that TTFs with neither hydrogen bonding nor long-chain alkane immobilization can form molecular wire structures on solid surfaces.

Method used

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  • Organic molecular line and preparation method
  • Organic molecular line and preparation method
  • Organic molecular line and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) In a 1.5mL centrifuge tube, add about 0.5mg of TTF to 1mL of n-tetradecane solvent (concentration is about 0.5mg / mL), and use an ultrasonic instrument (power of 100W) to sonicate for more than 10 minutes to ensure that TTFs are uniform Dispersed and dissolved in a solvent;

[0043] 2) Treat the HOPG substrate: select a graphite sheet with a flat surface, and stick off a layer of the surface with an adhesive tape to obtain an atomically flat HOPG surface;

[0044] 3) After transferring to the dropper, drop a drop of solution (about 1 μL) onto the clean surface of HOPG. Since both graphite and the solution are hydrophobic, the solution diffuses on the graphite surface to form a film with uniform thickness, and TTFs molecules adsorb on the surface of HOPG to form molecular lines.

[0045] In order to use a scanning tunneling microscope (STM) to measure the molecular wires prepared in this example, the HOPG dripped with the above solution was first fixed on the sample st...

Embodiment 2

[0049] In a 1.5mL centrifuge tube, add about 0.5mg of DP-TTF to 1mL of n-tetradecane (concentration is about 0.5mg / mL), and ultrasonically disperse for about ten minutes to completely dissolve the molecule. After transferring to the dropper, drop a drop of the solution (approximately 1 μL) onto the clean HOPG surface (newly cleaved HOPG). Since graphite and the solution are both hydrophobic, the solution diffuses on the graphite surface to form a film of uniform thickness. In order to measure with a scanning tunneling microscope (STM), the HOPG dripped with the above solution was first fixed on the sample stage, and then the STM needle tip (Pt / Ir, 80:20) was manipulated to slowly approach the sample surface until it was immersed in the film. Do not touch the graphite surface, then scan to obtain the STM image of the DP-TTF-n-tetradecane molecule adsorbed at the solid-liquid interface (reference Figure 2A , Figure 2B ). In order to reduce or avoid the influence of the needl...

Embodiment 3

[0053] In a 1.5mL centrifuge tube, add about 0.05mg of DN-TTF to 1mL of n-tetradecane (concentration is about 0.05mg / mL), and ultrasonically disperse for about ten minutes to completely dissolve the molecule. After transferring to the dropper, drop a drop of the solution (approximately 1 μL) onto the clean HOPG surface (newly cleaved HOPG). Since graphite and the solution are both hydrophobic, the solution diffuses on the graphite surface to form a film of uniform thickness. In order to measure with a scanning tunneling microscope (STM), the HOPG dripped with the above solution was first fixed on the sample stage, and then the STM needle tip (Pt / Ir, 80:20) was manipulated to slowly approach the sample surface until it was immersed in the film. Do not touch the graphite surface, then scan to obtain the STM image of the DN-TTF-n-tetradecane molecule adsorbed at the solid-liquid interface (reference Figure 3A , Figure 3B ). In order to reduce or avoid the influence of the nee...

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Abstract

The invention relates to an organic molecular line. The molecular line comprises tetrathiafulvalene, derivative thereof and a substrate, the tetrathiafulvalene and the derivative thereof are accumulated along the lowest-system energy direction Pi-Pi on the surface of the substrate, the intermolecular distance of the organic molecular line is 0.5nm to 0.8nm, and the organic molecular line is 40nm to 400nm long and 0.8nm to 1.2nm wide; the organic molecular line has a single-layered double-molecular line structure or a single-line structure on the surface of the substrate; and the molecular line makes the included angle of 60 degrees or 120 degrees with the molecular axis. A method for preparing the molecular line has the following steps that: TTFs is dispersed and dissolved in tetradecane,so that the tetradecane solution of TTFs is obtained; the tetradecane solution of TTFs is dripped to a clean, even highly oriented pyrolytic graphite (HOPG) surface, and after the solution is dispersed and stabilized on the surface, the one-dimensional ordered TTFs molecular line is obtained. The invention utilizes the solution method to realize the self-assembling growth of TTFs molecules on thesolid surface, a molecular line which is tens to hundreds of nanometers long can be obtained, and the preparation technique is simple, and is applicable to various TTFs molecules.

Description

technical field [0001] The invention relates to a class of organic molecular wires and a preparation method, in particular to a method for preparing ordered tetrathiafulvalene or derivatives (TTFs) molecular wires on the surface of high temperature pyrolytic graphite (HOPG). Background technique [0002] Organic semiconductors have attracted widespread attention due to their potential applications in integrated circuits, especially organic field-effect transistors, flexible displays, and organic light-emitting diodes (Antonio Facchetti, Materialstoday, 2007, 10, 29-37). Compared with inorganic semiconductors, organic semiconductors can be prepared by simple and low-cost methods and have high purity. Tetrathiafulvalene (TTF) and its derivatives (TTFs) are an important class of organic molecules with π-conjugated structures, which serve as electron donors in molecular charge transfer complexes (Jose L. Segura and Nazario Martín, Angew. Chem. Int. Ed. 2001, 40, 1372-1409). C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/00B82Y10/00B82Y40/00H01B1/12
Inventor 赵淼江鹏江潮
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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