(524f) ONE STEP Synthesis of Raspberry-LIKE Gold Nanoparticles

Raspberry-like gold nanoparticles were prepared by the reduction of HAuCl₄ in the solution containing soybean peptides (Mw=10000) and sodium dodecyl benzene sulfonate (SDBS). Soybean peptide and SDBS together acted as soft template in reacted solutions. Soybean peptide also played another role of reducing agent. The resulting gold nanostructures were characterized by transmission electron microscopy (TEM), electron diffraction pattern (ED) and UV-vis spectra. It was found that anisotropic gold nanostructures with various shapes were prepared by changing the concentration of SDBS. With a fixed concentration of 0.2 mM HAuCl₄ and 0.4% Soybean peptide, as there were SDBS less than 0.1 mM, spherical gold nanoparticles were prepared; as 0.3 mM, some multipodlike gold nanoparticles formed; as 0.5 mM, raspberry-like gold nanoparticles synthesized. Electron diffraction pattern showed that the crystal structures of raspberry-like gold nanoparticles scattering points corresponding to different gold crystalline facets. It is confirmed that raspberry-like gold polycrystalline nanoparticles grew from many small particles that have random and independent orientation.