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Preparation and Characterization of Conductive and Photoluminescent DNA-Templated Polyindole Nanowires

Lookup NU author(s): Dr Reda Hassanien, Mariam Al Hinai, Professor Lidija Siller, Professor Nick Wright, Professor Andrew HoultonORCiD, Dr Ben Horrocks

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Abstract

Polyindole (PIn) nanowires were formed on a lambda-DNA template by chemical oxidation of indole using aqueous FeCl3. The resulting nanowires are smooth, regular, conductive and had diameters in the range of 5-30 nm. These features allow them to be aligned by molecular combing and studied by scanned conductance microscopy, conductive AFM, and two-terminal I - V measurements. Using this combination of measurements, we find that the conductivity of PIn/DNA nanowires is between 2.5 and 40 S cm(-1) at room temperature, which is substantially greater than that in previous reports on the bulk polyindole conductivity (typically 10(-2)-10(-1) S cm(-1)). The conductance at zero bias shows an Arrhenius-type of dependence on temperature over the range of 233 to 373 K, and the values observed upon heating and cooling are repeatable within 5%; this behavior is consistent with a hopping mechanism of conductivity.

Publication metadata

Author(s): Hassanien R, Al-Hinai M, Al-Said SAF, Little R, Siller L, Wright NG, Houlton A, Horrocks BR

Publication type: Article

Publication status: Published

Journal: ACS Nano

Year: 2010

Volume: 4

Issue: 4

Pages: 2149-2159

Print publication date: 10/03/2010

Acceptance date: 23/02/2010

ISSN (print): 1936-0851

ISSN (electronic): 1936-086X

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/nn9014533

DOI: 10.1021/nn9014533

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