Abstract
Gold nanoparticles (AuNPs) were prepared by reducing AuCl3 using agar as a reducing and stabilizing agent. The formation of AuNPs was evidenced by strong absorption peak at 534–543nm caused by the characteristic surface plasmon resonance (SPR) of gold nanoparticle. Height of SPR peak increased with increase in the concentration of AuCl3. The AuNPs observed with TEM were spherical in shape with particle size of 2–20nm. The presence of elemental gold was also confirmed by EDX analysis. The XRD pattern of the AuNPs exhibited four characteristic peaks of gold at 38.2, 44.4, 64.6, and 77.8° of 2θ corresponding to the face centered cubic (fcc) structure of crystalline AuNPs with (111), (200), (220), and (311) planes of gold, respectively. These results confirmed that natural biopolymer agar had potential to be used as a reducing and stabilizing agent for AuNPs.
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