An apparatus for measuring the thickness of graphene oxide coatings deposited on a support substrate are described. The apparatus includes a light source and a photodetector which can be placed directly into a coating line to provide continuous feedback on the thickness of a fabricated graphene oxide coating, enabling fabrication of controlled thickness coatings and real-time quality monitoring.

An apparatus for measuring the thickness of graphene oxide coatings deposited on a support substrate are described. The apparatus includes a light source and a photodetector which can be placed directly into a coating line to provide continuous feedback on the thickness of a fabricated graphene oxide coating, enabling fabrication of controlled thickness coatings and real-time quality monitoring.

Provided are methods for synthesizing a graphene gel. In embodiments, such a method comprises flowing a graphene oxide composition comprising graphene oxide and a solvent, the solvent having a boiling point higher than pure water, through a reaction chamber under conditions to deoxygenate the graphene oxide and induce gelation to form a graphene gel suspended in the solvent and flowing through the reaction chamber.

Provided are methods for synthesizing a graphene gel. In embodiments, such a method comprises flowing a graphene oxide composition comprising graphene oxide and a solvent, the solvent having a boiling point higher than pure water, through a reaction chamber under conditions to deoxygenate the graphene oxide and induce gelation to form a graphene gel suspended in the solvent and flowing through the reaction chamber.

Provided herein is a method for preparing graphene-oxide, the method including contacting graphene and at least one oxidant in a solution including at least one acid solvent thereby forming graphene-oxide.

Provided herein is a method for preparing graphene-oxide, the method including contacting graphene and at least one oxidant in a solution including at least one acid solvent thereby forming graphene-oxide.

The invention utilizes swelling and fusion effects of graphene oxide in a solvent to implement cross-linked bonding of a graphene material itself and materials such as polymers, metal, paper, glass, carbon materials, and ceramics. The present invention not only overcomes the shortcoming in traditional adhesives of residual formaldehyde, but also has short drying time, high bonding strength and high corrosion resistance. The present invention is widely applied in the fields of aviation, aerospace, automobiles, machinery, construction, chemical, light industry, electronics, electrical appliances, and daily life, etc.

The invention utilizes swelling and fusion effects of graphene oxide in a solvent to implement cross-linked bonding of a graphene material itself and materials such as polymers, metal, paper, glass, carbon materials, and ceramics. The present invention not only overcomes the shortcoming in traditional adhesives of residual formaldehyde, but also has short drying time, high bonding strength and high corrosion resistance. The present invention is widely applied in the fields of aviation, aerospace, automobiles, machinery, construction, chemical, light industry, electronics, electrical appliances, and daily life, etc.

The disclosure provides a preparation method for a graphene material-based resistive gas sensor array and an application method thereof. The preparation method includes: adding a metal salt solution to a graphene oxide solution to obtain a mixed suspension, adjusting a pH of the mixed suspension and dispersing the mixed suspension under ultrasound, incubating the mixed suspension on a shaker, then washing it with deionized water followed by dispersing it in a deionized water to obtain metal ion-induced graphene oxide self-assembled suspension, and preparing a plurality of parts of the suspension by varying the preparation conditions; and adding the plurality of parts of metal ion-induced graphene oxide self-assembled suspension respectively to fingers of a multi-site interdigitated electrode array, and drying naturally, reducing the plurality of parts of the suspension at 60 to 120° C. for 3 to 30 min. The disclosure achieves uniform loading of a graphene material on a substrate.

The disclosure provides a preparation method for a graphene material-based resistive gas sensor array and an application method thereof. The preparation method includes: adding a metal salt solution to a graphene oxide solution to obtain a mixed suspension, adjusting a pH of the mixed suspension and dispersing the mixed suspension under ultrasound, incubating the mixed suspension on a shaker, then washing it with deionized water followed by dispersing it in a deionized water to obtain metal ion-induced graphene oxide self-assembled suspension, and preparing a plurality of parts of the suspension by varying the preparation conditions; and adding the plurality of parts of metal ion-induced graphene oxide self-assembled suspension respectively to fingers of a multi-site interdigitated electrode array, and drying naturally, reducing the plurality of parts of the suspension at 60 to 120° C. for 3 to 30 min. The disclosure achieves uniform loading of a graphene material on a substrate.