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Self-assembled two-dimensional nanofluidic proton channels with high thermal stability

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  • Jiao-Jing Shao

    (Northwestern University
    Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University
    Present address: School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China)

  • Kalyan Raidongia

    (Northwestern University
    Present address: Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India)

  • Andrew R. Koltonow

    (Northwestern University)

  • Jiaxing Huang

    (Northwestern University)

Abstract

Exfoliated two-dimensional (2D) sheets can readily stack to form flexible, free-standing films with lamellar microstructure. The interlayer spaces in such lamellar films form a percolated network of molecularly sized, 2D nanochannels that could be used to regulate molecular transport. Here we report self-assembled clay-based 2D nanofluidic channels with surface charge-governed proton conductivity. Proton conductivity of these 2D channels exceeds that of acid solution for concentrations up to 0.1 M, and remains stable as the reservoir concentration is varied by orders of magnitude. Proton transport occurs through a Grotthuss mechanism, with activation energy and mobility of 0.19 eV and 1.2 × 10−3 cm2 V−1 s−1, respectively. Vermiculite nanochannels exhibit extraordinary thermal stability, maintaining their proton conduction functions even after annealing at 500 °C in air. The ease of constructing massive arrays of stable 2D nanochannels without lithography should prove useful to the study of confined ionic transport, and will enable new ionic device designs.

Suggested Citation

  • Jiao-Jing Shao & Kalyan Raidongia & Andrew R. Koltonow & Jiaxing Huang, 2015. "Self-assembled two-dimensional nanofluidic proton channels with high thermal stability," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8602
    DOI: 10.1038/ncomms8602
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