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Title: Photothermoelectric Response of Ti3C2Tx MXene Confined Ion Channels
Authors: Hong, S
Zou, G
Kim, H
Huang, D
Wang, P 
Alshareef, HN
Issue Date: 2020
Source: ACS nano, 2020, v. 14, no. 7, p. 9042-9049
Abstract: With recent growing interest in biomimetic smart nanochannels, a biological sensory transduction in response to external stimuli has been of particular interest in the development of biomimetic nanofluidic systems. Here we demonstrate the MXene-based subnanometer ion channels that convert external temperature changes to electric signals via preferential diffusion of cations under a thermal gradient. In particular, coupled with a photothermal conversion feature of MXenes, an array of the nanoconfined Ti3C2Tx ion channels can capture trans-nanochannel diffusion potentials under a light-driven axial temperature gradient. The nonisothermal open-circuit potential across channels is enhanced with increasing cationic permselectivity of confined channels, associated with the ionic concentration or pH of permeant fluids. The photothermoelectric ionic response (evaluated from the ionic Seebeck coefficient) reached up to 1 mV·K-1, which is comparable to biological thermosensory channels, and demonstrated stability and reproducibility in the absence and presence of an ionic concentration gradient. With advantages of physicochemical tunability and easy fabrication process, the lamellar ion conductors may be an important nanofluidic thermosensation platform possibly for biomimetic sensory systems.
Keywords: MXene lamellar membranes
Nanoconfined cation channels
Photothermal conversion
Thermo-osmosis
Thermoelectric Seebeck coefficient
Titanium carbide
Publisher: American Chemical Society
Journal: ACS nano 
EISSN: 1936-086X
DOI: 10.1021/acsnano.0c04099
Rights: © 2020 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
The following publication Hong, S., Zou, G., Kim, H., Huang, D., Wang, P., & Alshareef, H. N. (2020). Photothermoelectric Response of Ti3C2T x MXene Confined Ion Channels. ACS nano, 14(7), 9042-9049, is available at https://doi.org/10.1021/acsnano.0c04099
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