Method for preparing gold nanoparticles

The invention belongs to the field of a nano material and particularly relates to a method for preparing gold nanoparticles. The method selects 2,6-dipicolinic acid (PDCA) as a reducing agent to reduce chloroauric acid to generate the gold nanoparticles by reaction; and then the 2,6-dipicolinic acid is used as a protecting agent on the surfaces of the gold nanoparticles; and the reaction condition is moderate and the gold nanoparticles are spherical nanoparticles which are mono-dispersed and uniform. The obtained gold nanoparticles are characterized by an ultraviolet-visible light spectrum (UV-vis), a transmission electron microscope (TEM) and x-ray energy spectrum analysis. The result shows that the particles are spherical, are uniform in size, the diameters of the particles are 6-8nm and the dispersion degree of the gold nanoparticles is high. The method for preparing the gold nanoparticles has the advantages of convenience for operation, moderate condition, and high yield, adopts environment-friendly mater