Polymer-assisted deposition of films and preparation of carbon nanotube arrays using the films
View Patent ↗Carbon nanotubes were prepared by coating a substrate with a coating solution including a suitable solvent, a soluble polymer, a metal precursor having a first metal selected from iron, nickel, cobalt, and molybdenum, and optionally a second metal selected from aluminum and magnesium, and also a binding agent that forms a complex with the first metal and a complex with the second metal. The coated substrate was exposed to a reducing atmosphere at elevated temperature, and then to a hydrocarbon in the reducing atmosphere. The result was decomposition of the polymer and formation of carbon nanotubes on the substrate. The carbon nanotubes were often in the form of an array on the substrate.
1. An article of manufacture comprising:
a substrate; and,
a uniform conformal coating of a polymer and metal containing layer thereon, said polymer selected from polyethyleneimine or a derivative thereof, said metal being a first metal selected from iron, cobalt, nickel, and molybdenum and a second metal selected from aluminum and magnesium, said polymer and metal containing layer further including a binding agent selected from ethylenediaminetetraacetic acid and derivatives and a salt thereof.
2. A composition of matter comprising a homogenous solution of:
a first metal precursor selected from iron, cobalt, nickel, and molybdenum;
a second metal precursor selected from magnesium and aluminum,
a soluble polyethylenimine or polyethylenimine derivative,
a binding agent selected from ethylenediaminetetraacetic acid or a salt thereof, the binding agent forming a complex with the first metal precursor and with the second metal precursor; and
a suitable solvent.
3. The composition of matter of claim 2 , wherein said solvent is selected from water, lower alcohols, acetone, tetrahydrofuran, propylene carbonate, acetonitrile, ethylacetate, acetic acid, and mixtures thereof.
4. The composition of matter of claim 2 , wherein said solvent is water.