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Proceedings Paper

Tungsten diselenide as a substrate for the imaging of liquid crystals by scanning tunneling microscopy
Author(s): David L. Sampson; B. A. Parkinson
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Paper Abstract

Most scanning tunneling microscopy (STM) work dealing with ordered organic films have primarily relied on highly ordered pyrolytic graphite as a substrate (HOPG). A second substrate, molybdenum disulfide (MoS2), is appearing more often as a substrate. In this paper, we introduce a new substrate for the imaging of ordered systems. Tungsten diselenide (WSe2) is a layered material similar in structure to MoS2. The change in surface periodicity for HOPG to MoS2 caused significant changes in the ordering of liquid crystals. This is not completely unexpected given the two different types of surfaces. In this contribution two n-alkyl-cyanobiphenyls (mCBs; m equals 6,8) were imaged on WSe2. The differences between MoS2 and WSe2 are less drastic when compared to HOPG, yet the ordered structure that was found for 8CB was a new monolayer type structure while the 6CB structure is very similar to what has been found for this molecule on MoS2.

Paper Details

Date Published: 30 March 1995
PDF: 6 pages
Proc. SPIE 2384, Scanning Probe Microscopies III, (30 March 1995); doi: 10.1117/12.205922
Show Author Affiliations
David L. Sampson, Colorado State Univ. (United States)
B. A. Parkinson, Colorado State Univ. (United States)

Published in SPIE Proceedings Vol. 2384:
Scanning Probe Microscopies III
Mehdi Vaez-Iravani, Editor(s)

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