▎ 摘　　要

NOVELTY - Graphene based gold-platinum bimetallic catalyst comprises graphene as carrier and gold-platinum bimetallic core-shell nano-structure having 35-50nm diameter. The gold-platinum bimetallic core-shell nano-structure is provided as active site, where the gold is metal core, platinum is metal shell. The gold-platinum bimetallic core-shell nano-structure is covered with thiol-modified poly(N-isopropylacrylamide) grafted dextran which is provided as thermal stimulation response factor. The catalyst comprises 28-42.5 wt.% graphene, 2.4-9 wt.% gold and 2.4-9 wt.% platinum. USE - Graphene based gold-platinum bimetallic catalyst. ADVANTAGE - The graphene based gold-platinum bimetallic catalyst catalyst is temperature-sensitive and re-usable. DETAILED DESCRIPTION - Graphene based gold-platinum bimetallic catalyst comprises graphene as carrier and gold-platinum bimetallic core-shell nano-structure having 35-50nm diameter. The gold-platinum bimetallic core-shell nano-structure is provided as active site, where the gold is metal core, platinum is metal shell. The gold-platinum bimetallic core-shell nano-structure is covered with thiol-modified poly(N-isopropylacrylamide) grafted dextran which is provided as thermal stimulation response factor. The catalyst comprises 28-42.5 wt.% graphene, 2.4-9 wt.% gold, 2.4-9 wt.% platinum and 50-60 wt.% thiol-modified poly(N-isopropylacrylamide) grafted dextran. The total mass of the components is 100 wt.%. An INDEPENDENT CLAIM is included for a method for preparing graphene based gold-platinum bimetallic catalyst, which involves: (A) mixing 0.8-1.5 mg/ml graphene solution to gold ions in mass ratio of 1:0.07-0.258; (B) adding 8-12 millimole/liter chloroauric acid solution and stirring at 30-80 degrees C for 100-120 minutes to obtain mixed solution; (C) adding 8-12 millimole/liter sodium citrate solution and then adding chloroauric acid and silver nitrate in molar ratio of 1:0.67-1.5; (D) adding silver nitrate and potassium tetrachloro platinum in molar ratio of 1:1; (E) centrifuging to obtain supernatant and washing product; (F) maintaining pH at 6.5-7 and lyophilizing precipitate to obtain graphene based gold-platinum bimetallic catalyst catalyst precursor; (G) adding 3-5 mg/mL poly(N-isopropylacrylamide) grafted dextran in presence of nitrogen and oxygen for 30 minutes; (H) adding 60-80 wt.% isopropylamine to obtain thiol-modified poly(N-isopropylacrylamide) grafted dextran; (I) mixing graphene based gold-platinum bimetallic catalyst catalyst precursor solution and obtained thiol-modified poly(N-isopropylacrylamide) grafted dextran in mass ratio of 1:1-1.5 for 30-60 minutes under nitrogen environment at 10-30 degrees C; (J) washing with water and centrifuging to obtain supernatant; (K) maintaining pH at 6.5-7; and (L) lyophilizing precipitate and then washing to obtain graphene based gold-platinum bimetallic catalyst catalyst.