Jump to main content
Jump to site search

Issue 15, 2014
Previous Article Next Article

2D-ice templated titanium oxide films as advanced conducting platforms for electrical stimulation

Author affiliations

Abstract

Directional freezing has been widely employed to prepare highly ordered three-dimensional (3D) porous assemblies. However, in this scenario, there is one concept that has not been extensively explored: by applying directional freezing to a nanoparticle (NP) dispersion supported on a substrate, two-dimensionally (2D) patterned films may be produced. In this study, tunable 2D-patterning of TiO2-NP dispersions on alumina substrates is demonstrated. By imposing different temperature gradients throughout the ceramic dispersion coatings, both homogeneous (non-patterned) and highly aligned patterned topologies (consisting of parallel grooves) were produced. In the case of patterned films, the orientation of the grooves was modulated from those oriented along the freezing direction to those perpendicularly oriented to the temperature gradient. Thermally induced reduction of the prepared films led to electrically conducting titanium oxide Magnéli phases. The measured resistances were strongly dependent on the orientation of the aligned patterns. To demonstrate the possibility of employing these structured films as platforms for electrical stimulation-related applications, a stimulating electronic circuit was developed and connected to the prepared films. Charge-balanced biphasic stimulus pulses with tunable current amplitudes and frequencies were successfully delivered through the conducting 2D-patterned assemblies.

Graphical abstract: 2D-ice templated titanium oxide films as advanced conducting platforms for electrical stimulation

Back to tab navigation

Supplementary files

Article information


Submitted
29 Nov 2013
Accepted
23 Jan 2014
First published
24 Jan 2014

J. Mater. Chem. C, 2014,2, 2806-2814
Article type
Paper
Author version available

2D-ice templated titanium oxide films as advanced conducting platforms for electrical stimulation

H. E. Romeo, F. Trabadelo, M. Jobbágy and R. Parra, J. Mater. Chem. C, 2014, 2, 2806
DOI: 10.1039/C3TC32370F

Social activity

Search articles by author

Spotlight

Advertisements