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Patterned Growth of Well-Aligned Carbon Nanotubes: A Soft-Lithographic Approach

2000; American Chemical Society; Volume: 104; Issue: 10 Linguagem: Inglês

10.1021/jp994152w

1520-6106

Shaoming Huang, Albert W. H. Mau, Terence W. Turney, Paul White, Liming Dai,

Microfluidic and Capillary Electrophoresis Applications

Using microcontact printing (μCP) and micromolding techniques, we have prepared micropatterns of carbon nanotubes aligned in a direction normal to the substrate surface. While the μCP process involves the region-specific transfer of self-assembling monolayers (SAMs) of alkylsiloxane onto a quartz substrate and subsequent adsorption of polymer chains in the SAM-free regions, the micromolding method allows the formation of polymer patterns through solvent evaporation from a precoated thin layer of polymer solution confined between a quartz plate and a poly(dimethylsiloxane) (PDMS) elastomer mold. The polymer patterns formed in both cases were then carbonized into carbon black for region-specific growth of the aligned nanotubes in the polymer-free regions by pyrolysis of iron(II) phthalocyanine (FePc) under Ar/H2 atmosphere at 800−1100 °C. Micropatterns of aligned nanotubes thus prepared have resolutions down to 0.8 μm, suitable for fabrication of various electronic and photonic devices.