▎ 摘　　要

NOVELTY - Method for expanding melting and freezing point range of nanoporous gold involves dealloying gold-silver alloy film in concentrated nitric acid at 25 degrees C in constant temperature water bath for 45 minutes, immersing dealloyed film in ultrapure water for 20 minutes to obtain nanoporous gold sheet, carrying out methane pyrolysis reaction using nanoporous gold sheet as catalyst, using heating chip to collect nanoporous flakes in ultrapure water and assembling heating chip into in-situ transmission electron microscope gas phase system, washing entire gas system with inert gas for 40 minutes at normal pressure, introducing methane gas, heating to 346 degrees C at 20 degrees C/min, growing graphene on surface of nanoporous gold, stop heating when the graphene layer on the surface of nanoporous gold is completely grown and obtaining graphene-bound nanoporous gold. USE - Method for expanding melting and freezing point range of nanoporous gold. ADVANTAGE - The method expands the temperature range in which the nanoporous gold completely melts and solidifies to about 270 degrees C, thereby expanding the application range of graphene and nanoporous gold.