Synthesis of Multipod-Like Gold Nanoparticles Using Sodium Carboxymethyl Cellulose by Self-Reduction Method

A new green chemical method is reported to synthesize multipod-like gold nanoparicles through reducing HAuCl4 by sodium carboxymethyl cellulose (CMC-Na). Temperature and CMC-Na together controlled the nanoparticle growth. TEM image displayed directly that the reduced products possessed multipod-like morphology. With a fixed concentration of CMC-Na (150 g/L), as the reaction temperature was 90 oC, there were spherical gold nanoparticles (about 60 nm) formed; as 80 oC, some anisotropic gold nanoparticles synthesized; as 70 oC, many tripod, tetrapod and pentapod gold nanoparticles with equivalent diameter around 120 nm prepared. XRD pattern suggested that the multipod-like nanoparticles were grown preferentially along (111) lattice plane. UV-Vis absorption spectrum of multipod-like gold nanoparticles showed that absorption bands at 800 nm became stronger. The preferred multipod-like noble metal nanoparticles may be obtained easily by this green chemical method.