Surface Modification of Gold Nanostars Through the Changes on Gold Seed Concentrations
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.329
Surface Modification of Gold Nanostars Through the Changes on Gold Seed Concentrations Juan Carlos Martinez Espinosa1, Miguel Jose Yacaman2, German Plascencia Villa2, Victor Hugo Romero Arellano3, Ana Karen Zavala Raya4 1
Instituto Politécnico Nacional-UPIIG, Silao de la Victoria, Guanajuato, Mexico.
2
Physics and Astronomy Department, University of Texas at San Antonio, San Antonio, TX, United States.
3
Centro Universitario de Tonala, Universidad de Guadalajara, Tonala, Jalisco, Mexico.
4
Nanobiotech A.C., Leon, Guanajuato, Mexico.
Abstract
Due to its excellent optical properties, gold nanomaterials with anisotropic morphology are playing an important role in biomedical applications, specifically in the use of Surface Enhanced Raman Spectroscopy (SERS) technique for biological assays. In this work, we verified the behavior of the star shape nanoparticle peaks obtained by chemical synthesis (precursor reactant: HAuCl4, cationic surfactant: CTAB) and whose peaks were formed from the different concentrations of gold seeds (55, 65, 75 and 85 ul) which were added to the total solution (5.275 ml). The shape and size of the nanoparticles was verified with a Hitachi S5500 microscope with a BF & DF SEM / STEM detector, and for the diameter distribution (hydrodynamic) was carried out by the dynamic light distribution technique with a Malvern DLS system Zetasizer Nano ZS. Particle sizes (peak-to-peak considering) were obtained with variations from 107 to 166 nm. The results suggest adding 75 ul of gold seeds to obtain uniform nanostars with well defined peaks. These gold nano-stars could be applied for identification of specific membrane markers for the study of different types of cancer by the SERS technique.
INTRODUCTION Nanoparticles are entities of different morphologies with dimensions between1 and 100 nm, whose stability in colloidal solution has been a very active line of research in distinct areas. Nanotechnology has found a place in the fields of biotechnology and medicine.
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These nanomaterials offer themselves specific physicochemical properties that are not commonly exhibited, and where the materials exhibit constant physical properties regardless of its size. The manipulation of matter at the nanoscale has led to obtain materials highly precise in composition and properties using nanotechnology. This area has progressed rapidly in recent years, particularly in the manufacture of devices such as nanowires, nanotubes, nanoparticles, and nanocrystals. These nanomaterials possess characteristics and upper electrical, magnetical, optical and mechanical properties and different materials compared to the macroscopic [1-3]. Currently nanomaterials are marketed for various applications such as food,
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