Charge transport in a liquid crystalline triphenylene polymer monolayer at air–solid interface

Literature Information

Publication Date 2016-03-24
DOI 10.1039/C5CP07531A
Impact Factor 3.676
Authors

H. N. Gayathri, Bharat Kumar, K. A. Suresh, H. K. Bisoyi, Sandeep Kumar


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Abstract

We have prepared a monolayer of a novel liquid crystalline polymer derived from 2,6-dihydroxy-3,7,10,11-tetraalkoxy-triphenylene (PHAT) at an air–water interface and transferred it onto freshly cleaved mica as well as gold coated mica substrates by the Langmuir–Blodgett (L–B) technique. The atomic force microscope (AFM) images of these L–B films show a uniform coverage with a thickness of 1.5 nm. Electrical conductivity measurements were carried out on the PHAT monolayer deposited on the gold coated mica substrate using a current sensing AFM (CSAFM). The gold substrate–PHAT monolayer–cantilever tip of CSAFM forms a metal–insulator–metal (M–I–M) junction. The CSAFM yields a non-linear current–voltage (I–V) curve for the M–I–M junction. The analysis of the I–V characteristics of the M–I–M junction indicated that the charge transport in the liquid crystalline polymer monolayer is by the direct tunneling mechanism. The barrier height for the PHAT monolayer was estimated to be 1.22 ± 0.02 eV.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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