Patent ID: 11897162
Assignee: ZHEJIANG A & F UNIVERSITY
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 3:
4. The method for preparing a piezoresistive sensor material according to claim 1, further wherein, in the third step, the nano conductive phase suspension is a reduced graphene oxide (rGO) suspension, wherein the rGO suspension is prepared by the following steps:
adding 2 g of graphite powder to 45 mL of concentrated sulfuric acid with a mass fraction of 98% under a 0° C. ice water bath and mechanical stirring, and adding 10 g of potassium permanganate at a rate of about 0.5 g/min to form a suspension;
transferring the above suspension to a 35° C. water bath, and stirring vigorously for 24 h; heating to 90° C., and adding 250 mL of deionized water; stirring a resulting mixture vigorously for 30 min, and cooling to room temperature; adding 10 mL of a 30% (v/v) H2O2 aqueous solution, and thoroughly stirring a resulting mixture; centrifuging the resulting mixture at 10,000 rpm for 15 min, and removing a resulting supernatant; and washing a resulting precipitate with deionized water, and repeating the centrifuging and washing operations 5 times to obtain a graphene oxide (GO) concentrate;
diluting a portion of the GO concentrate to 20 mL with a concentration of 5 mg/mL, and adding 20 mL of 55% (v/v) HI aqueous solution, conducting reduction at room temperature for 6 hours, and conducting dialysis for one week to obtain an rGO suspension precursor; and
adjusting the concentration of rGO to 0.05 mg/mL, 0.1 mg/mL and 0.2 mg/mL, separately, and subjecting resulting solutions to ultrasonication for 15 min to obtain rGO suspensions with three different concentrations.