Abstract
Different shapes (nanosphere or nanorod) of gold nanoparticles (Au-NPs) were synthesized with and without ultrasonic irradiation in the presence of citric acid. Spherical-shaped and rod-shaped Au-NPs showed different surface plasmon resonance (SPR) absorption bands. The Au-NPs with different shapes were immobilized on a monolayer of 3-aminopropyltriethoxysilane (APS) coated on an indium-tin oxide (ITO) electrode. The potential dependence of the SPR band of different shaped Au-NPs in an aqueous solution was explored. The SPR band and intensity changes of the Au-NPs were found to depend on the applied potential. The spherical-shaped and rod-shaped Au-NPs showed different SPR absorption behaviors when potential was applied. These behavior changes were interpreted as the result of the potential-induced changes of the local dielectric environment around the nanoparticles due to molecular absorption/desorption and the charging/discharging of the particles.
| Original language | English |
|---|---|
| Pages (from-to) | 5914-5923 |
| Number of pages | 10 |
| Journal | Electrochimica Acta |
| Volume | 52 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - 2007 May 25 |
Keywords
- Gold nanoparticles
- ITO electrode
- In situ UV-vis
- Surface plasmon resonance
- Ultrasound
ASJC Scopus subject areas
- Chemical Engineering(all)
- Electrochemistry