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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Controlled chain polymerisation and chemical soldering for single-molecule electronics.

Yuji Okawa1, Megumi Akai-Kasaya, Yuji Kuwahara

  • 1International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan. OKAWA.Yuji@nims.go.jp

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|April 21, 2012
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Summary

Researchers developed a method to wire single molecules using conductive polymer chains, a key step for advancing single-molecule electronics. This technique enables precise connections for novel nanoelectronic devices.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Molecular Electronics

Background:

  • Single functional molecules hold promise for next-generation nanoelectronic devices.
  • Current limitations in connecting these molecules hinder progress in single-molecule electronics.

Purpose of the Study:

  • To present a viable method for connecting functional molecules using single conductive polymer chains.
  • To summarize advancements in controlled polymerization and chemical soldering for molecular wiring.

Main Methods:

  • Utilizing scanning tunneling microscope (STM) tip-initiated chain polymerization to fabricate single conductive polymer chains.
  • Investigating the properties of polydiacetylene chains.
  • Applying "chemical soldering" for covalent connection of polymer chains to molecules.

Main Results:

  • Demonstrated controlled chain polymerization of diacetylene compounds.
  • Established polydiacetylene chains as suitable conductive linkers.
  • Successfully connected single polydiacetylene chains to single functional molecules via chemical soldering.

Conclusions:

  • The developed method is crucial for realizing single-molecule electronics.
  • Controlled polymerization and chemical soldering represent a significant advancement in molecular wiring.
  • This approach paves the way for novel nanoelectronic devices.