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Vol. 30 No. 7 (2018): Vol 30 Issue 7

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pH Dependence on the Synthesis of Gold Nanoparticles Capped Na-Citrate from Adsorbed Au(III) and Au(0) on Salicylic Acid Immobilized Mg/Al Hydrotalcite

https://doi.org/10.14233/ajchem.2018.20765
P.A. Krisbiantoro
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia
A. Muawanah
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia
R.A. Almas
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia
S.J. Santosa
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia

Corresponding Author(s) : S.J. Santosa

sjuari@ugm.ac.id

Asian Journal of Chemistry, Vol. 30 No. 7 (2018): Vol 30 Issue 7

Abstract

The investigation of pH dependence on the synthesis of gold nanoparticles capped Na-citrate from adsorbed Au(III) and Au(0) on salicylic acid immobilized hydotalcite had been carried out under ultrasound irradiation. Evidenced by UV-visible spectrophotometer, pH 3.0 revealed to be the optimum condition where gold nanoparticles show the evidence of surface plasmon resonance (SPR) at 547 nm. The deprotonation of 1- and 2-carboxylic groups of capping agent citrate was lead to the forming of [C6H6O7]2– which acts as both reduction and desorption agents of Au(III) and Au(0), respectively. Characterization using X-ray diffraction and transmission electron microscopy supported the successful synthesis of gold nanoparticles by the appearance of gold lattice index (111; 200; 220 and 311) and 2D nanoparticles image with the average size of 84.72 nm.

Keywords

Gold nanoparticles Hydrotalcite Citrate pH Capping agent
Krisbiantoro, P., Muawanah, A., Almas, R., & Santosa, S. (2018). pH Dependence on the Synthesis of Gold Nanoparticles Capped Na-Citrate from Adsorbed Au(III) and Au(0) on Salicylic Acid Immobilized Mg/Al Hydrotalcite. Asian Journal of Chemistry, 30(7), 1413–1417. https://doi.org/10.14233/ajchem.2018.20765
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