Synthesis and spectroscopic characterization of gold nanobipyramids prepared by a chemical reduction method

Abstract

Gold nanobipyramids (NBPs) have attracted much attention because they have potential for applications in smart sensing devices, such as medical diagnostic equippments. This is due to the fact that they show more advantageous plasmonic properties than other gold nanostructures. We describe a chemical reduction method for synthesizing NBPs using conventional heating with ascorbic acid reduction and cetyltrimethylamonium bromide (CTAB)+AgNO 3 as capping agents. The product was characterized by ultraviolet-visible spectroscopy (UV-vis), Fourier transmission infrared spectroscopy (FTIR), transmission electron microscopy (TEM), x-ray powder diffraction (XRD). The results showed that gold nanoparticles were formed with bipyramid shape (tip-to-tip distance of 88.4±9.4 nm and base length of 29.9±3.2 nm) and face-centered-cubic crystalline structure. Optimum parameters for preparation of NBPs are also found.

A review of the biological synthesis of gold nanoparticles using fruit extracts: scientific potential and application

“…Nanoparticles (NPs) derived from noble metals play an important role in nanotechnology because of their wide range of applications [1][2][3][4][5][6][7]. The synthesis of NPs can be carried out using chemical (e.g., synthesis by sodium citrate) [8,9], physical (e.g., synthesis using laser ablation or microwave/ultraviolet radiation) [10][11][12] or biological methods (synthesis using bacteria, fungi or plants) [13][14][15][16][17][18][19][20]. Most of the chemical and physical methods are invasive and require the application of toxic compounds or harmful radiation.…”