Method for preparing multipurpose isoionic gold nanoparticle film

The invention discloses a method for preparing a multipurpose isoionic gold nanoparticle film and belongs to the technical field of material chemistry. By using a gold nanoparticle modified by deoxyribonucleic acid (DNA), the gold nanoparticle is assembled layer by layer in the process of complimentary hybridization of the DNA, and the gold nanoparticle film is prepared; the gold nanoparticle film is represented through a scanning electron microscopy and an atomic force microscope, so that the surface of the prepared film is regular and homogeneous, and the thickness of the film is about 1 micrometer; and the prepared gold nanparticle film is subjected to mechanical property test, the hardness of the film can be tested greatly higher than that of the original gold nugget through a test performed by a nano indenter, and the Young modulus is 80.85 GPa. The gold nanoparticle film can be well applied to nano sensors and high-strength materials in the future.