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Lookup NU author(s): Dr Raushan Nurdillayeva,
Dr Osama El-Zubir,
Professor Andrew Houlton,
Dr John Hedley,
Dr Andrew Pike,
Dr Ben Horrocks
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
Cadmium sulfide can be templated on -DNA molecules to form an aqueous dispersion ofCdS/-DNA nanowires. Subsequent addition of ethylene glycol to 50% v/v is sufficient toformulate an ink suitable for printing using piezoelectric drop-on-demand technology. Printeddroplet arrays show a coffee-ring morphology of individual deposits by fluorescence andRaman microscopy, but upon increasing the number of layers of printed material by repeatedprinting over each droplet, the dry deposit approaches closer to a disc shape. It is also possibleto print parallel tracks by reducing the droplet separation in the array until neighbouringdroplets overlap before they dry. The droplets coalesce to form a strip of width roughly equalto the diameter of the droplets. Evaporation-driven capillary flow sends the nanowires to theedges of the strip and when dry they form parallel tracks of CdS/-DNA nanowire bundles.Both droplets and tracks were printed onto Pt-on-glass interdigitated microelectrodes (10 mwidth, 10 m gap). The current-voltage characteristics of these two-terminal devices wereapproximately ohmic, but with some hysteresis. The conductance increased with temperatureas a simple activated process with activation energies of 0.57 ± 0.02 eV (tracks) and 0.39 ±0.02 eV (droplets). The impedance spectra of the printed films were consistent with hoppingbetween CdS grains.
Author(s): Nurdillayeva RN, Oshido AB, Bamford TA, El-Zubir O, Houlton A, Hedley J, Pike AR, Horrocks BR
Publication type: Article
Publication status: Published
Print publication date: 03/04/2018
Online publication date: 19/01/2018
Acceptance date: 19/01/2018
Date deposited: 16/01/2018
ISSN (print): 0957-4484
ISSN (electronic): 1361-6528
Publisher: Institute of Physics Publishing Ltd.
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