▎ 摘　　要

NOVELTY - A nickel-deposited graphene substrate is soaked in etching solution, reacted, maximum of nickel foam is replaced by chemical, nickel metal is turned into small nickel particles, pre-stretched, washed and dried. The pre-stretched elastic substrate is glued to a hollow frame along with transfer of fishing method with respect to pre-stretched elastic substrate, dried, and substrate is further pre-stretched to obtain self-assembled graphene/nickel particle mixed structure. Electrodes are formed at both ends of structure, to obtain spongy graphene-based stretchable gas sensor. USE - Preparation of spongy graphene-based stretchable gas sensor (claimed). ADVANTAGE - The method efficiently and economically provides gas sensor with high conductivity and gas sensitivity. DETAILED DESCRIPTION - A nickel foam is added into a vacuum reactor heating area, reactor is evacuated while heating, then hydrogen gas is supplied into the vacuum reactor, heated at 100-500 degrees C for 10-30 minutes and then annealed. The annealed foam is heated to 900-1100 degrees C, carbon is added into vacuum reactor, hydrogen flow rate is maintained, nickel is grown for 5-180 minutes after turning off the gas and cooled to room temperature to obtain nickel directly deposited on graphene substrate (graphene-nickel foam). The obtained graphene substrate is soaked in an etching solution, reacted, maximum of the nickel foam is replaced by chemical, nickel metal is turned into small nickel particles, pre-stretched, then washed using acetone, alcohol and distilled water, and dried. The pre-stretched elastic substrate is glued to a hollow frame along with the transfer of the same type of fishing method with respect to pre-stretched elastic substrate, naturally-dried, and the substrate is pre-stretched to 1.5-4 times the original length along stretching direction, or stretched to original area of 2-10 times in two orthogonal directions to obtain self-assembled graphene/nickel particle mixed structure. Electrodes are formed at both ends of the graphene/nickel particle mixed structure, to obtain spongy graphene-based stretchable gas sensor.