METHOD FOR REDUCING GRAPHITE OXIDE
Graphite oxide can be converted to its reduced form (r-GO) using exposing UV radiation having a peak wavelength (λ max ) of less than 400 nm while being maintained at a temperature that is greater than room temperature. This conversion method is efficient and can be carried out with various forms of graphite oxide samples, below atmospheric pressure, or in a reducing environment.
1 . A method for reducing graphite oxide comprising:
exposing a sample comprising graphite oxide (GO) to UV radiation having a peak wavelength of less than 400 nm to change at least 40% of the graphite oxide (GO) to reduced graphite oxide (r-GO), wherein this exposing is carried out when the sample is at a temperature of at least 50° C. and up to and including 450° C.
2 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to the UV radiation to change at least 60% of the graphite oxide (GO) to reduced graphite oxide (r-GO).
3 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation sufficient to provide at least 0.1 J/cm 2 to change at least 40% to reduced graphite oxide (r-GO).
4 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation to provide reduced graphite oxide (r-GO) in a random pattern in the sample.
5 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation to provide reduced graphite oxide (r-GO) in a predetermined non-random pattern in the sample.
6 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to radiation to provide reduced graphite oxide (r-GO), wherein the sample of graphite oxide (GO) is at a pressure of less than 100 torr.
7 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation to provided reduced graphite oxide (r-GO), wherein the sample of graphite oxide (GO) is in a reducing environment.
8 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is provided as a part of a surface coating on a substrate to provide reduced graphite oxide (r-GO) in the surface coating.
9 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is provided as part of a surface coating on a non-oxidative substrate to provide reduced graphite oxide (r-GO) in the surface coating.
10 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is provided as a component of a composite comprising an electronically conductive polymer to provide reduced graphite oxide (r-GO) in the composite.
11 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is a component of a composite comprising one or more electronically conductive polymers that is a thiophene-containing polymer, aniline-containing polymer, or a pyrrole-containing polymer, to provide reduced graphite oxide (r-GO) in the composite.
12 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is in the form of a coating having a thickness of less than 10 μm, to provide reduced graphite oxide (r-GO) in the coating.
13 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is at least partially underneath a non-graphite oxide (GO) material, to provide reduced graphite oxide (r-GO) at least partially underneath the non-graphite oxide (GO) material.
14 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is in the form of a single layer of graphene oxide, to provide reduced graphite oxide (r-GO) in the single layer.
15 . The method of claim 1 comprising, exposing the sample comprising graphite oxide (GO) to UV radiation, wherein the sample is maintained at a temperature of less than 400° C. and a pressure of less than 760 torr, or the sample is maintained at the noted temperature while in a reducing environment.
16 . The method of claim 1 , comprising exposing the sample comprising graphite oxide (GO) when the sample is at a temperature of at least 75° C. and up to and including 400° C.