Gold nanoparticles are currently experiencing an exposion of researches of their properties and their application potentials. The development to the next generation of nanotechnology reqiures products of gold nanoparticles having preciesly controlled size, shape, purity, and large production fecility.Up to now it has not been yet possible to produce gold nanoparticles in large scale for industrial productuion. Such the present investigation aims an efficient and convienient production routes to generate spherical and purified gold nanoparticles. The main tagets are to generate uniform gold nanoparticles in aquous solutions via chemical reduction methods, and to modify the production routes for their industrial production which could generate final products in good quality and large quantity.Here we present the citrate reduction process and the NaBH4 reduction process in aqueous solutions, and both of these processes were scaled up. Different experimental parameters have been studied to optimize the process. Dialysis are applied as the post treatment for gold nanoparticles in aqueous solutions to achieve high drgree purity, together with the study of the stability of gold nanoparticles.Nanotrac Wave analyzer, TEM and ICP analysis methods are used in the study to measure the particle size distribution, and the purification degree of the gold nanoparticles.Keywords: gold nanoparticles, citrate reduction process, NaBH4 reduction process, purification
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