Title:	Transition in nanoscale electrical conductivity in the Langmuir- Blodgett film of a novel liquid crystalline oligomer
Authors:	Kumar, Bharat Suresh, K.A. Bisoyi, Hari Krishna Kumar, Sandeep
Issue Date:	Jul-2020
Publisher:	IOP Publishing Ltd
Citation:	Nano Express, 2020, Vol.1, Article No.010006
Abstract:	We have studied the nanoscale electrical conductivity of a monolayer film of a novel star shaped liquid crystalline molecule, hexatriphenylene substituted anthraquinone (AQD6). The molecule has a central core of electron deficient anthraquinone moiety connected to six electron rich triphenylene moieties by flexible alkyl chains. The monolayer formed at air-water interface was transferred onto the solid substrates by Langmuir-Blodgett (LB) technique and its surface topography was imaged using an atomic force microscope (AFM). The limiting area obtained from the surface pressure-area per molecule isotherm and the topography of the AFM images suggest that the anthraquinone moiety of the AQD6 molecule is organized in face-on configuration on the substrate and the triphenylene moieties are in edge-on configuration extended away from the substrate. We have studied the electrical conductivity of the AQD6 monolayer deposited on gold coated silicon substrate using a current sensing AFM. Analysis of current (I) − voltage (V) characteristics of the metal-monolayer film-metal junction showed a transition from direct tunneling to an injection tunneling. Further, we have estimated the barrier height and the effective mass of electron in the metal-monolayer film-metal junction.
Description:	Open Access
URI:	http://hdl.handle.net/2289/7504
ISSN:	2632-959X
Alternative Location:	https://doi.org/10.1088/2632-959X/ab79ff
Copyright:	2020 The Author(s)
Appears in Collections:	Research Papers (SCM)

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