The invention discloses a gold micro-nano
composite structure array and a preparation method thereof. The array is a gold bowl array or a gold hollow sphere array disposed above a
gold film covered on a substrate, wherein the
diameter of a gold bow opening is from 500 nanometers to 10 micrometers, a bowl wall is composed of gold rods, the lengths of the gold rods are 100-1000 nanometers, the diameters of the gold rods are 50-400 nanometers, the inner
diameter of a gold hollow sphere is from 500 nanometers to 10 micrometers, a sphere casing is composed of
gold particles with diameters of 50-600 nanometers, and the thickness of the
gold film is 5-25 nanometers. The preparation method includes
sputtering a layer of the
gold film on the substrate, placing a single layer
colloidal crystal template which is composed of
polystyrene colloidal spheres with diameters from 500 nanometers to 10 micrometers on the substrate which is covered with the gold film, then placing the substrate covered with the gold film and the
colloidal crystal template into a
chloroauric acid solution with concentration of 0.3-0.7g / L, using the solution with the substrate as a
working electrode, subjecting the mixture to electro-deposition for 2-8 hours under the deposition
electric current density of 0.03-0.05mA / cm<2> or 0.15-0.45mA / cm<2> to obtain a complex array, and placing the complex array in a
dichloromethane solution for to removing the
polystyrene colloidal spheres to obtain target products. The gold micro-nano
composite structure array can be used as a surface enhanced
raman scattering active substrate.