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Author

Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Self-assembled monolayers on Pt(111): Molecular packing structure and strain effects observed by scanning tunneling microscopy

Cited 14 times inthomson ciCited 11 times inthomson ci
Title
Self-assembled monolayers on Pt(111): Molecular packing structure and strain effects observed by scanning tunneling microscopy
Author
Lee, SPark, JRagan, RKim, SLee, ZonghoonLim, DKOhlberg, DAAWilliams, RS
Keywords
ALKANETHIOL MONOLAYERS; AU(111) SURFACE; GOLD; NANOTECHNOLOGY; ARCHITECTURE; NANOWIRES; STABILITY; PLATINUM; PHASES
Issue Date
200605
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.128, no.17, pp.5745 - 5750
Abstract
Self-assembled monolayers (SAMs) of octanethiol and benzeneethanethiol were deposited on clean Pt(111) surfaces in ultrahigh vacuum (UHV). Highly resolved images of these SAMs produced by an in situ scanning tunneling microscope (STM) showed that both systems organize into a super-structure mosaic of domains of locally ordered, closely packed molecules. Analysis of the STM images indicated a (√3 × √3)R30° unit cell for the octanethiol SAMs and a 4(√3 × √3)R30° periodicity based on 2 × 2 basic molecular packing for the benzeneethanethiol SAMs under the coverage conditions investigated. SAMs on Pt(111) exhibited differences in molecular packing and a lower density of disordered regions than SAMs on Au(111). Electron transport measurements were performed using scanning tunneling spectroscopy. Benzeneethanethiol/Pt(111) junctions exhibited a higher conductance than octanethiol/Pt(111) junctions.
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DOI
http://dx.doi.org/10.1021/ja058037c
ISSN
0002-7863
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MSE_Journal Papers

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