SINTESIS DAN KARAKTERISASI GOLD NANOBIPYRAMIDS

Abstract

This study aims to synthesize and characterize gold nanobipyramids (GNBPs). Synthesis of GNBPs uses the Seed Mediated Growth Method (SMGM) or better known as the seed mediated growth method. GNBPs were characterized using UVVis, XRD and FESEM spectroscopy to determine their optical properties, structure and morphology. The UV-Vis absorption spectrum of GNBPs shows that the t-SPR peak is at a wavelength of 573 nm and the l-SPR peak is at a wavelength of 755 nm. The results of XRD characterization at a diffraction angle of 30 ° - 70 ° showed 3 diffraction peaks at an angle of 2θ: 38.0557 °, 44.3365 ° and 64.44438 °. Based on standard data references in the Inorganic Crystal Structure Database (ICSD) No. 98- 005-2249, it is known that GNBPs have a Face Centered Cubic (FCC) structure and it is confirmed that the nanoparticles formed are gold nanoparticles with crystal plane orientation (111), (200), and (220). From the FESEM photo, the percentage density of the sample surface was 78.86% and the average values for length, width, and aspect ratio were 104.85 nm, 43.39 nm, and 2.46, respectively