Synthesis of Bimetallic (Ag-Au) Nanoparticles/Si Under Controlled Conditions Using A Laser-Assisted Wet KOH Etching Process

Abstract

Anisotropic KOH etchants are primarily used on this Si substrate to make pyramids on the surface of Si. Because the etching pathway is variable and random in nature, it is difficult to control over this process. Throughout this work, we used laser radiation to modify the topographical properties of Si substrates throughout the anisotropic during wet etching process with potassium hydroxide, as a highly effective, easy, and low-cost method of texturing Si substrates. The variations of illumination wavelength plays an important role in re surfaces texturing. Well-controlled formation bimetallic nano particles a uniform and dense aggregation of bimetallic nanoparticles was achieved; SERS active substrates with high efficiency were developed. Scanning electron microscopy (SEM) images, Atomic force microscopy (AFM), and X-Ray diffraction were used to evaluate the optical response of the textured surfaces.