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Issue 10, 2010
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Polyelectrolyte and carbon nanotube multilayers made from ionic liquid solutions

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Abstract

The inevitable contact of substrates with water during the traditional practice of layer-by-layer assembly (LBL) creates problems for multiple potential applications of LBL films in electronics. To resolve this issue, we demonstrate here the possibility of a LBL process using ionic liquids (ILs), which potentially eliminates corrosion and hydration processes related to aqueous media and opens additional possibilities in structural control of LBL films. ILs are also considered to be one of the best “green” processing solvents, and hence, are advantageous in respect to traditional organic solvents. Poly(ethyleneimine) (PEI) and poly(sodium styrenesulfonate) (PSS) were dispersed in a hydrophilic IL and successfully deposited in the LBL fashion. To produce electroactive thin films with significance to electronics, a similar process was realized for PSS-modified single-walled carbon nanotubes (SWNT-PSS) and poly(vinyl alcohol) (PVA). Characterization of the coating using standard spectroscopy and microscopy techniques typical of the multilayer field indicated that there are both similarities and differences in the structure and properties of LBL films build from ILs and aqueous solutions. The films exhibited electrical conductivity of 102 S m−1 with transparency as high as 98% for visible light, which is comparable to similar parameters for many carbon nanotube and graphene films prepared by both aqueous LBL and other methods.

Graphical abstract: Polyelectrolyte and carbon nanotube multilayers made from ionic liquid solutions

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Publication details

The article was received on 03 Nov 2009, accepted on 31 Dec 2009 and first published on 01 Feb 2010


Article type: Paper
DOI: 10.1039/B9NR00333A
Citation: Nanoscale, 2010,2, 2084-2090
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    Polyelectrolyte and carbon nanotube multilayers made from ionic liquid solutions

    T. Nakashima, J. Zhu, M. Qin, S. Ho and N. A. Kotov, Nanoscale, 2010, 2, 2084
    DOI: 10.1039/B9NR00333A

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