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129th General Meeting of Korean Chemical Society & Exposition Influence of plasma treatment on AuNRs immobilized on ITO surfaces

Submission Date :
2 / 28 / 2022 , 15 : 07 : 08
Abstract Number :
Presenting Type:
Oral Presentation
Presenting Area :
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
Authors :
Ji Won Ha*, Mukunthan Ramasamy
Department of Chemistry, University of Ulsan, Korea
Assigned Code :
ANAL2.O-25 Assigend Code Guideline
Presenting Time :
FRI, 10 : 36
Localized surface plasmon resonance (LSPR) is a unique property associated with certain metallic nanomaterials (e.g., Au, Ag, Cu). LSPR is a collective oscillation of conduction band free electrons in metallic nanostructures due to interactions with light. The LSPR spectrum of plasmonic nanoparticles (eg. Au, Ag, Cu) is influenced by the size, shape, composition, and change in dielectric properties of the surrounding medium (refractive index). Gold nanoparticles (AuNPs) have been considered in this work because of their broadly tunable size, shape, and structure-dependent optical properties, the easy possibility of surface modifications by biological and organic molecules, biocompatibility, and photostability. Plasma, the fourth state of matter, is a partially ionized gas consisting of electrons, ions, and neutral atoms/ molecules. Radiofrequency (RF) plasma, a nonthermal plasma (the gas temperature is as low as room temperature), is often used to remove surface capping material and to change the morphology of metallic nanoparticles (NPs). In this study, we discuss the spectral, structural, and electrochemical behavior of AuNRs immobilized of ITO for various plasma exposure times by dark-field (DF) microscopy and spectroscopy, scanning electron microscopy (SEM), and cyclic voltammetry (CV). Single gold nanorods (AuNRs) of considerable size were immobilized on the ITO surface and have been subjected to various plasma exposure times. We analyze here the LSPR linewidth variations of scattering spectra, effect in aspect ratio (AR) and morphology of AuNRs from SEM image analysis, and possible facet modification of AuNRs from CV analysis as a function of plasma exposure time.