Patent ID: 9529129
Filing Date: 2016-12-27
CPC Classification: C01B,F41H,G02B,G02F,Y10T

Claim Text:
1. An article of manufacture, comprising: a graphene-based broadband optical limiter, comprising a graphene-polyvinyl alcohol (PVA) gel, wherein the graphene-PVA gel comprises: (a) a PVA gel as a base material; (b) a plurality of graphene nano-sheets suspended in the PVA gel; and (c) a coating of single-stranded DNA, formed on the plurality of graphene nano-sheets, wherein the graphene-PVA gel is made by: preparing a starting graphene suspension comprising a plurality of graphene nano-sheets suspended in water; preparing a solution of a reagent dissolved in a buffer, wherein the reagent comprises double-stranded deoxyribonucleic acid (dsDNA); mixing the starting graphene suspension with the reagent solution to form a mixture, sonicating and heating the mixture such that the dsDNA is unzipped to form the single-stranded DNA, and the single-stranded DNA is coated on the plurality of graphene nano-sheets to form a stabilized graphene suspension; mixing the stabilized graphene suspension with 4 percent by weight (wt %) borax aqueous solution to form a borax solution; mixing 1 part of the borax solution with 9 part of a 4 wt % PVA aqueous solution to form a resulting mixture; and homogenizing the resulting mixture under 70° C. water bath and allowing the resulting mixture to sit overnight, so as to form the graphene-PVA gel, wherein the graphene-PVA gel has a linear transmittance of about 50% at 532 nm with a path length of about 10 millimeter.