Tungsten diselenide as a substrate for the imaging of liquid crystals by scanning tunneling microscopy

David L. Sampson; B. A. Parkinson

doi:10.1117/12.205922

30 March 1995 Tungsten diselenide as a substrate for the imaging of liquid crystals by scanning tunneling microscopy

David L. Sampson, B. A. Parkinson

Proceedings Volume 2384, Scanning Probe Microscopies III; (1995) https://doi.org/10.1117/12.205922
Event: Photonics West '95, 1995, San Jose, CA, United States

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.

Citation Download Citation

David L. Sampson and 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); https://doi.org/10.1117/12.205922

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