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Coatings 2018, 8(4), 128; https://doi.org/10.3390/coatings8040128

Thickness-Dependent Bioelectrochemical and Energy Applications of Thickness-Controlled Meso-Macroporous Antimony-Doped Tin Oxide

1
School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA
2
Biodesign Center for Innovation in Medicine at Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
*
Author to whom correspondence should be addressed.
Received: 31 December 2017 / Revised: 17 March 2018 / Accepted: 28 March 2018 / Published: 2 April 2018
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Abstract

Coatings of hierarchically meso-macroporous antimony-doped tin oxide (ATO) enable interfacing adsorbed species, such as biomacromolecules, with an electronic circuit. The coating thickness is a limiting factor for the surface coverage of adsorbates, that are electrochemically addressable. To overcome this challenge, a carbon black-based templating method was developed by studying the composition of the template system, and finding the right conditions for self-standing templates, preventing the reaction mixture from flowing out of the mask. The thicknesses of as-fabricated coatings were measured using stylus profilometry to establish a relationship between the mask thickness and the coating thickness. Cyclic voltammetry was performed on coatings with adsorbed cytochrome c to check whether the entire coating thickness was electrochemically addressable. Further, bacterial photosynthetic reaction centers were incorporated into the coatings, and photocurrent with respect to coating thickness was studied. The template mixture required enough of both carbon black and polymer, roughly 7% carbon black and 6% poly(ethylene glycol). Coatings were fabricated with thicknesses approaching 30 µm, and thickness was shown to be controllable up to at least 15 µm. Under the experimental conditions, photocurrent was found to increase linearly with the coating thickness, up to around 12 µm, above which were diminished gains. View Full-Text
Keywords: thick coatings; hierarchically porous; meso-macroporous; biomacromolecule; TCO; ATO; nanomaterials; carbon black thick coatings; hierarchically porous; meso-macroporous; biomacromolecule; TCO; ATO; nanomaterials; carbon black
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mieritz, D.; Liang, R.; Zhang, H.; Carey, A.-M.; Chen, S.; Volosin, A.; Lin, S.; Woodbury, N.; Seo, D.-K. Thickness-Dependent Bioelectrochemical and Energy Applications of Thickness-Controlled Meso-Macroporous Antimony-Doped Tin Oxide. Coatings 2018, 8, 128.

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