Fabrication of Gold Nanoparticles of Different Sizes and its Interaction in Aquatic Phase
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.257
Fabrication of Gold Nanoparticles of Different Sizes and its Interaction in Aquatic Phase Rossymar Rivera Colón1, Wilfred Fonseca Ferrer1, Sonia J. Bailón-Ruiz2 1Department
of Biology University of Puerto Rico at Ponce
2Department
of Chemistry and Physics, University of Puerto Rico at Ponce
ABSTRACT
The generation of AuNPs was realized in presence of gold chloride (Au 3+), and citrate solution as reducing agent. The production of AuNPs was proved by the color change in the solution; from yellow to red wine. Purified nanostructures synthesized at citrate/Au 3+ molar ratio of 1.0/10.0 evidenced an absorption peak at 526 nm attributed to the localized surface Plasmon Resonance (LSPR) which suggested the formation of small gold nanoparticles (NPs). The decrease of citrate/Au3+ molar ratio at 1.0/3.0 provoked a growing of gold nanostructures, which was evidenced by a red shift in the SPR at 546nm. High Resolution Transmission Electron Microscopy technique evidenced the spherical form and sizes for both nanoparticles at the range 10-15 nm (small NPs) and 20-25 nm (big NPs), respectively. Electron Diffraction (ED) patterns for both sizes evidenced the (111), (200), (220), (311), and (222) reflections of face centered cubic (FCC) gold nanostructures. Studies of energy-dispersive X-ray Spectroscopy indicated peaks at 1.65, 2.12, 9.71, 11.58 and 13.38 keV for both nanostructures, which suggests the presence of gold into the crystalline structure of the nanoparticles. Interaction tests were carried out in presence of marine crustaceans and different concentrations of gold nanoparticles; including a control test. Both sizes evidenced to be toxic when the concentration and exposure time were increased.
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INTRODUCTION: Gold nanoparticles (AuNPs) are nanomaterials that have a remarkable phenomenon called Localized Surface Plasmon Resonance (LSPR) [1]. The LSPR is the result from the collective oscillation of the conduction electrons across the particle due to the resonant excitation by the incoming photons. The LSPR band intensity and wavelength depends on the factors affecting the electron charge density on the particle surface, such as shape, structure, particle size and the dielectric constant of the surrounding medium. In this way, gold nanostructures below than 30 nm will have an absorption of electromagnetic radiation in the bluegreen range whereas bigger nanoparticles will be able to absorb light in the red range [2-3]. Also, the absorbance and scattering properties of AuNPs can be change in accordance with their size parameter [4]. These unique optical properties observed in gold nanomaterials promote their use in a broad range of applications. Gold nanoparticles are currently used to enhance
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