Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.



The light-switching conductance of an anisotropic azobenzene-based polymer close-packed on horizontally aligned carbon nanotubes

Author affiliations

Abstract

Anisotropic light-switching properties are of great importance in advanced photodetectors, light-gated transistors, and energy storage devices. However, controlling the light-switching conductance of anisotropic materials remains challenging because of the difficulties in tuning the electronic interactions and microstructure in the longitudinal and transverse directions, respectively. We present a transparent and flexible photo-responsive film of azobenzene–poly(methyl methacrylate) (Azo–PMMA) close-packed on the sidewalls of horizontally aligned carbon nanotubes (HACNTs). The alignment leads to an anisotropic electrical conductivity (σ). The aligned composite film shows a steady increase in σ in the longitudinal (σ) and transverse directions (σ) during UV irradiation and a continuous decrease after irradiation. The light-switching conductance shows good cycling performance over 25 cycles, which is consistent with the isomerisation of the azobenzene groups in Azo–PMMA. Light-switching conductance is demonstrated in two directions, originating from the light-induced switch to a greater proportion of more conductive cis-Azo isomers, photo-doping and the film contracting during the trans-to-cis photo-isomerisation. The anisotropic Azo–PMMA/HACNT composite film with a light-switchable conductivity paves the way towards the fabrication of anisotropic photo-controllable materials by molecular design and microstructure modulation.

Graphical abstract: The light-switching conductance of an anisotropic azobenzene-based polymer close-packed on horizontally aligned carbon nanotubes

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 10 Jan 2017, accepted on 03 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7TC00142H
Citation: J. Mater. Chem. C, 2017, Advance Article
  •   Request permissions

    The light-switching conductance of an anisotropic azobenzene-based polymer close-packed on horizontally aligned carbon nanotubes

    S. Li, Y. Feng, P. Long, C. Qin and W. Feng, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC00142H

Search articles by author