▎ 摘　　要

NOVELTY - An alcohol hydrogel sensing device based on layered carbon nanosheets include an electrolyte grid-controlled graphene transistor and a hydrogel (7). The electrolyte grid-controlled graphene transistor is fixedly mounted in the hydrogel. The transistor includes a glass substrate (4), three metal electrodes, a single-layer graphene (5) and layered carbon nanosheets (6). The three metal electrodes are source electrode (1), a drain electrode (2) and a gate electrode (3). The three metal electrodes are deposited on the glass substrate. The single-layer graphene is arranged on the graphene channel between the source electrode and drain electrode. The layered carbon nanosheet is modified on the gate electrode. The layered carbon nanosheet is a layered carbon nanosheet derived from Chlorella. The hydrogel is prepared by polymerizing alcohol oxidase and polyacrylamide. USE - Alcohol hydrogel sensing device based on layered carbon nanosheets used for detecting alcohol blowing (claimed). ADVANTAGE - The device is economical and easy to manufacture, and has low working voltage and high portability, and quickly detects drinking condition in real time. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of alcohol hydrogel sensing device based on layered carbon nanosheets, which involves manufacturing substrate by using glass sheet as glass substrate, ultrasonically cleaning the glass substrate, manufacturing patterned electrode by drying the glass substrate with nitrogen, fixing on mask plate with adhesive tape, using magnetron sputtering to deposit patterned chromium/gold electrode on the glass substrate, depositing chromium layer and gold layer, preparing single-layer graphene using mixture of methane and hydrogen to synthesize single-layer graphene by chemical vapor deposition, using copper foil as catalytic substrate, spin-coating polymethyl methacrylate film on the graphene, immersing in an etching solution to etch the copper substrate, washing multiple times with distilled water, transferring graphene using wet transfer method to transfer graphene to the source electrode and drain electrode of the patterned substrate in water, annealing, soaking annealed substrate in acetone, replacing with new acetone, soaking again, repeating multiple times packaging of the device by protecting metal wire of source, drain and gate electrodes with waterproof siloxane layer, modifying synthesized layered carbon nanosheet on bare gold electrode of the gate, drying, adding acrylamide solution, alcohol oxidase solution and phosphate buffered salt solution into the container and stirring, polymerizing the gel under N,N,N',N'-tetramethyldiamine and ammonium persulfate, embedding the transistor and blow tube in the gel, and obtaining hydrogel sensing device, where the whole process is performed on ice, and the hydrogel sensing device is refrigerated; and (2) method for detecting alcohol blowing by using layered carbon nanosheet-based alcohol hydrogel sensing device, which involves determining concentration of alcohol gas by measuring real-time response curve of channel current by measuring channel current change with time under condition of fixed source electrode voltage and gate electrode voltage, when the channel current basically does not change, using current value as initial current, and starting to transfer the hydrogel, where the change in current caused by mid-blowing and exhalation corresponds to concentration of alcohol gas. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the electrolyte grid-controlled graphene transistor. Source electrode (1) Drain electrode (2) Gate electrode (3) Glass substrate (4) Single-layer graphene (5) Layered carbon nanosheet (6) Hydrogel (7)