30 March 1995 Tungsten diselenide as a substrate for the imaging of liquid crystals by scanning tunneling microscopy
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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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David L. Sampson, B. A. Parkinson, "Tungsten diselenide as a substrate for the imaging of liquid crystals by scanning tunneling microscopy", Proc. SPIE 2384, Scanning Probe Microscopies III, (30 March 1995); doi: 10.1117/12.205922; https://doi.org/10.1117/12.205922
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