Photothermoelectric Response of Ti3C2TxMXene Confined Ion Channels

Seunghyun Hong, Guodong Zou, Hyunho Kim, Dazhen Huang, Peng Wang, Husam N. Alshareef

Research output: Journal article publicationJournal articleAcademic researchpeer-review

44 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)9042-9049
Number of pages8
JournalACS Nano
Volume14
Issue number7
DOIs
Publication statusPublished - 28 Jul 2020

Keywords

  • MXene lamellar membranes
  • nanoconfined cation channels
  • photothermal conversion
  • thermo-osmosis
  • thermoelectric Seebeck coefficient
  • titanium carbide

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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