Miniature graphene aerogel device and preparation method thereof

A method for preparing a miniature graphene aerogel device having a miniature graphene aerogel unit, the method comprising:

• printing on a substrate of a device with a graphene oxide solution as an ink;
• dripping a polar solution containing a foaming agent after solidifying to plasticize and foam the graphene oxide;
• and
• drying and reducing to obtain a miniature graphene aerogel unit on the substrate of the device,
• wherein the foaming agent comprises a self-foaming agent or a reactive foaming agent, wherein the reactive foaming agent is a foaming agent that reacts with an oxygen-containing functional group of graphene oxide to produce a gas, and the self-foaming agent is a foaming agent that decomposes to produce a gas;
• and
• wherein the reactive foaming agent comprises a borohydride;
• and the self-foaming agent comprises a bicarbonate.