Metallic and bimetallic nanoparticles are sought for their catalytic properties as well as medical applications. To date, developing a method for controlled size and morphology is still a challenge. In this project, gold and gold-platinum nanoparticles were synthesized by sol-gel method. Effects of reducing agent concentration and/or temperature in the system on particle size were studied using UV-Vis and X-ray diffraction. Preliminary results show that citrate concentrations ranging from 0.7% to 1.0% can be used without causing major differences in the surface plasmon absorption using 1.0 mM KAuCl4. The variation in temperature was found to cause more shifts in the UV-vis spectrum. Temperatures from 93 to 106 �C showed absorption peaks between 528 and 536 nm, which correspond to the plasmon band of gold nanoparticles of ~40 nm, according to literature. Particle size is also being characterized in both dry and in colloidal solution by using X-ray diffraction.

Gold and gold-platinum nanoparticles synthesis and characterization by spectroscopy methods and X-ray diffraction

245th National Meeting (2013)

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