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Fabrication of Conjugated Polymer Nanowires by Edge Lithography

Fabrication of Conjugated Polymer Nanowires by Edge Lithography

Darren J Lipomi, Ryan C Chiechi, Michael D Dickey, George M Whitesides

Nano Lett. 2008 Jul;8(7):2100-5.

PMID: 18517256

Abstract:

This paper describes the fabrication of conjugated polymer nanowires by a three stage process: (i) spin-coating a composite film comprising alternating layers of a conjugated polymer and a sacrificial material, (ii) embedding the film in an epoxy matrix and sectioning it with an ultramicrotome (nanoskiving), and (iii) etching the sacrificial material to reveal nanowires of the conjugated polymer. A free-standing, 100-layer film of two conjugated polymers was spin-coated from orthogonal solvents: poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) from chloroform and poly(benzimidazobenzophenanthroline ladder) (BBL) from methanesulfonic acid. After sectioning the multilayer film, dissolution of the BBL with methanesulfonic acid yielded uniaxially aligned MEH-PPV nanowires with rectangular cross sections, and etching MEH-PPV with an oxygen plasma yielded BBL nanowires. The conductivity of MEH-PPV nanowires changed rapidly and reversibly by >10 (3) upon exposure to I 2 vapor. The result suggests that this technique could be used to fabricate high-surface-area structures of conducting organic nanowires for possible applications in sensing and in other fields where a high surface area in a small volume is desirable.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP34398577	Poly(benzimidazobenzophenanthroline)		34398-57-7	Price

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