Electronic control over attachment and self-assembly of alkyne groups on gold

Qing Li, Chengbo Han, Miguel Fuentes-Cabrera, Humberto Terrones, Bobby G. Sumpter, Wenchang Lu, Jerry Bernholc, Jieyu Yi, Zheng Gai, Arthur P. Baddorf, Petro Maksymovych, Minghu Pan

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Self-assembled monolayers are the basis for molecular nanodevices, flexible surface functionalization, and dip-pen nanolithography. Yet self-assembled monolayers are typically created by a rather inefficient process involving thermally driven attachment reactions of precursor molecules to a metal surface, followed by a slow and defect-prone molecular reorganization. Here we demonstrate a nonthermal, electron-induced approach to the self-assembly of phenylacetylene molecules on gold that allows for a previously unachievable attachment of the molecules to the surface through the alkyne group. While thermal excitation can only desorb the parent molecule due to prohibitively high activation barriers for attachment reactions, localized injection of hot electrons or holes not only overcomes this barrier but also enables an unprecedented control over the size and shape of the self-assembly, defect structures, and the reverse process of molecular disassembly from a single molecule to a mesoscopic length scale. Electron-induced excitation may therefore enable new and highly controlled approaches to molecular self-assembly on a surface.

Original languageEnglish
Pages (from-to)9267-9275
Number of pages9
JournalACS Nano
Volume6
Issue number10
DOIs
StatePublished - Oct 23 2012

Keywords

  • 3D tethering
  • molecular reaction
  • scanning tunneling microscopy
  • self-assembly

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