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Polyelectrolyte and carbon nanotube multilayers made from ionic liquid solutions.

Takuya Nakashima1, Jian Zhu, Ming Qin

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.

Nanoscale
|October 9, 2010
PubMed
Summary

This study introduces layer-by-layer assembly (LBL) using ionic liquids (ILs) as a green alternative to water-based methods. This novel approach enables the creation of conductive and transparent thin films for electronic applications without water-induced issues.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Green Chemistry

Background:

  • Traditional layer-by-layer assembly (LBL) methods using water face challenges in electronic applications due to substrate corrosion and hydration.
  • Ionic liquids (ILs) offer a promising alternative as "green" solvents, mitigating issues associated with aqueous media and organic solvents.

Purpose of the Study:

  • To demonstrate the feasibility of LBL film fabrication using ionic liquids (ILs).
  • To develop electroactive thin films for electronic applications by adapting the IL-based LBL process.
  • To explore the structural and property differences between IL-based and aqueous-based LBL films.

Main Methods:

  • Layer-by-layer (LBL) assembly was performed using hydrophilic ionic liquids (ILs).
  • Poly(ethyleneimine) (PEI) and poly(sodium styrenesulfonate) (PSS) were used as model polymers.

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  • Electroactive films were fabricated using PSS-modified single-walled carbon nanotubes (SWNT-PSS) and poly(vinyl alcohol) (PVA).
  • Standard spectroscopy and microscopy techniques were employed for film characterization.

    • Main Results:

    • Successful fabrication of LBL films using ionic liquids was achieved.
    • Films composed of SWNT-PSS/PVA exhibited electrical conductivity of 10^2 S m^-1.
    • The fabricated films demonstrated high transparency (up to 98%) in the visible light spectrum.
    • Characterization revealed both similarities and differences in film structure compared to aqueous-based LBL films.

    Conclusions:

    • Ionic liquid-based LBL assembly is a viable "green" method for producing advanced thin films.
    • This technique offers a pathway to overcome limitations of traditional aqueous LBL processes for electronic applications.
    • The resulting films possess competitive electrical and optical properties, comparable to those produced by other advanced methods.