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Description
Gold nanorods (AuNRs) exhibit tuneable localized surface plasmon reso-nance (LSPR), making them valuable for sensing and nanophotonic. This study investigates the impact of ascorbic acid (AA) concentration on the plasmonic properties of AuNRs synthesized using the seed-mediated growth technique. AA concentrations ranging from 140 to 370 µL were used to produce nanorods with aspect ratios of 4-7. The synthesized AuNRs were characterized using UV-Visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), and Field Emission Scanning Electron Microscopy (FESEM) to evaluate their optical and morphological properties. OptiFDTD simulations were employed to model LSPR responses, analysing field in-tensities and spectral shifts. Experimental results demonstrated that in-creasing AA concentration reduced the aspect ratio, causing a blue shift in the longitudinal LSPR peak observed within the range of 680–840 nm. Ad-ditionally, the plasmonic signal increased by up to 5.47% that show the op-timised AA volume increases gold nanorod optical characteristics. Simulations confirmed these results by highlighting improved electric field intensities at resonance frequencies. This study provides insightful analysis of how to manipulate the plasmonic behaviour of AuNRs and further its uses in plasmonic sensing and nanotechnology.
Keywords: Gold nanorods, seed mediated growth, localized surface plas-mon resonance, Ascorbic acid, OptiFDTD
