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

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 (root 3 x root 3)R30 degrees unit cell for the octanethiol SAMS and a 4(root 3 x root 3)R30 degrees periodicity based on 2 x 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.
Publisher
AMER CHEMICAL SOC
Issue Date
2006-05
Language
ENG
Keywords

ALKANETHIOL MONOLAYERS; AU(111) SURFACE; GOLD; NANOTECHNOLOGY; ARCHITECTURE; NANOWIRES; STABILITY; PLATINUM; PHASES

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.128, no.17, pp.5745 - 5750

ISSN
0002-7863
DOI
10.1021/ja058037c
URI
http://hdl.handle.net/10203/10732
Appears in Collection
CH-Journal Papers(저널논문)
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