Please use this identifier to cite or link to this item:
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
ISSN: 2632-959X
Alternative Location:
Copyright: 2020 The Author(s)
Appears in Collections:Research Papers (SCM)

Files in This Item:
File Description SizeFormat 
2020_Nano_Express_Vol.1_Article No.010006.pdfOpen Access1.2 MBAdobe PDFView/Open

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.