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Formation of Non-Toxic Au Nanoparticles with Bimodal Size Distribution by a Modular Redesign of Ultrasonic Spray Pyrolysis

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This article reports about a new synthesis approach by the Ultrasonic Spray Pyrolysis of Au nanoparticles which consists of a separate heating zone for evaporation and subsequent connection of reduction gas by entering directly into the reaction zone. This redesign was made in order to control each step of the USP to find those influential parameters which dictate final gold nanoparticles' morphology and size. For the precursor a starting solution of HAuCl4 and water was used with various concentrations of Au (0.625 g/l, 1.25 g/l and 2.5 g/l). Other variable parameters were evaporation temperatures (75 °C, 80 °C and 85 °C) and time of synthesis (3 h, 6 h, 9 h), while the temperature in the heating zone was constant (350 °C) during performing all the experiments. Characterization of synthesized Au nanoparticles was carried out by Transmission Electron Microscopy (TEM). It was found that Au nanoparticles have bimodal size distribution. An investigation of the Au nanoparticles' electron diffractions enabled us to find the possible growth of Au nanocrystal types which was finally the base for setting up the synthesis mechanisms of Au nanoparticles. The cytocompatibility investigations of the Au nanoparticles suggested that they were not cytotoxic for L929 cells in vitro, but they can exhibit anti-proliferative properties, depending on their size distribution.
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Document Type: Short Communication

Publication date: November 1, 2015

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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