US2016297681A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016297681-A1 |
| Application number | US-201615183282-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 15, 2016 |
| Priority date | Feb 12, 2013 |
| Publication date | Oct 13, 2016 |
| Grant date | — |
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The present disclosure relates to a polymer-based large-area carbon nanomesh and a method for preparing the same. More particularly, the present disclosure provides a method for preparing a carbon nanomesh such as graphene nanomesh, including: preparing a polymer nanofilm by coating a solution of a block copolymer or a polymer mixture thereof on a substrate; stabilizing the polymer nanofilm by annealing such that the polymer nanofilm is phase-separated, a hole-forming polymer is removed and, at the same time, a nanomesh-forming polymer is cyclized and forms a stabilized polymer nanomesh; and carbonizing the stabilized polymer nanomesh by annealing at high temperature to prepare a carbon nanomesh. Using the phase separation and cyclization, a large-area carbon nanomesh with superior activity can be prepared simply with high reproducibility in large scale.
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What is claimed is: 1 . A polymer nanomesh consisting essentially of a planar structure, wherein the planar structure of the polymer nanomesh comprises a cyclized nanomesh-forming polymer and two-dimensional holes arranged on the planer structure. 2 . The polymer nanomesh according to claim 1 , wherein the nanomesh-forming polymer is cyclized to form the polymer nanomesh, and two-dimensional holes are formed by removal of a hole-forming polymer. 3 . The polymer nanomesh according to claim 2 , wherein a morphology of the polymer nanomesh depends on a morphology of a phase-separation of the hole-forming polymer and the nanomesh-forming polymer. 4 . A carbon nanomesh consisting essentially of a planar structure, wherein the planar structure of the carbon nanomesh comprises a cyclic structure of carbon atoms and two dimensional holes arranged on the planer structure, and wherein the cyclic structure of carbon atoms comes from a carbonization of a cyclized nanomesh-forming polymer. 5 . The carbon nanomesh according to claim 4 , wherein the two dimensional holes have a hole size of 1 nm˜1 μm. 6 . The carbon nanomesh according to claim 4 , wherein the carbon nanomesh has a geometry of inter-hole distance of 1 nm to 1 μm. 7 . The carbon nanomesh according to claim 4 , wherein the carbon nanomesh has a thickness of 0.4 nm or more. 8 . The carbon nanomesh according to claim 4 , wherein as a size of the holes increase, an inter-hole distance decreases. 9 . The carbon nanomesh according to claim 4 , wherein the carbon nanomesh has a band gap of 1 meV˜1 eV. 10 . The carbon nanomesh according to claim 4 , wherein a band gap of the carbon nanomesh is controlled by geometry of an inter-hole distance of the carbon nanomesh. 11 . The carbon nanomesh according to claim 4 , wherein the carbon nanomesh further comprises a metal film. 12 . The carbon nanomesh according to claim 4 , wherein the carbon nanomesh is a graphene nanomesh. 13 . A method for preparing a graphene nanomesh, comprising: preparing a polymer nanofilm by coating a solution of a block copolymer of a pore-forming polymer and a nanomesh-forming polymer or by coating a solution of a polymer mixture of a pore-forming polymer and a nanomesh-forming polymer, on a substrate, stabilizing the polymer nanofilm such that the pore-forming polymer is removed and the nanomesh-forming polymer is cyclized and forms a stabilized polymer nanomesh with pores; and carbonizing the stabilized polymer nanomesh with pores to prepare a graphene nanomesh. 14 . The method for preparing a graphene nanomesh according to claim 13 , which further comprises, before or after said stabilizing, depositing a metal nanofilm on the polymer nanofilm. 15 . The method for preparing a graphene nanomesh according to claim 13 , which further comprises, in said carbonizing, graphitizing the graphene nanomesh at 1800-3000° C. under an atmosphere of inert gas, hydrogen gas, vacuum or a combination thereof. 16 . The method for preparing a graphene nanomesh according to claim 13 , wherein said carbonizing is performed in the presence of a doping gas and the doping gas comprises a group 3-7 element. 17 . The method for preparing a graphene nanomesh according to claim 13 , wherein, in said carbonizing, volatile carbon molecules are injected and the volatile carbon molecules are acetylene, ethylene or methane.
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