Abstract
In this work we study the effect of different reducing agent (chitosan, starch and sugars) on to synthesis of silver (AgNPs) and gold (AuNPs) nanoparticles by reduction of silver nitrate (AgNO3) and chloroauric acid (HAuCl4), respectively. The plasmon absorption peak between 419 - 434 nm, measured using a UV-Vis spectrophotometer indicates the existence of AgNPs, this reaction was favored by the increase of temperature with optimal results at 90°C. Synthesis of AuNPs was only obtained using chitosan as reducing agent, the use of solutions of starch and sugars allows the reduction of the gold salt present in the chloroauric acid, however the low pH of the solutions creates thermodynamic instabilities for the AuNP synthesis, due to low repulsive force for colloid stability.
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Acknowledgment
The authors gratefully acknowledges financial support from Fundação de Apoio à Pesquisa do Estado de São Paulo (FAPESP), and the laboratory of Chemistry Biology for measuring the UV-Vis spectra.
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Ayala, G., Vercik, L., Menezes, T. et al. A Simple and Green Method for Synthesis of Ag and Au Nanoparticles using Biopolymers and Sugars as Reducing Agent. MRS Online Proceedings Library 1386, 1103 (2012). https://doi.org/10.1557/opl.2012.645
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DOI: https://doi.org/10.1557/opl.2012.645