Spectroelectrochemistry of Halide Anion Adsorption and Dissolution of Single Gold Nanorods
| Autor: | Agampodi S. De Silva Indrasekara, Chad P. Byers, Christy F. Landes, Stephan Link, Anneli Hoggard, Wei-Shun Chang, Thomas S. Heiderscheit, Benjamin S. Hoener |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Sodium
Inorganic chemistry Analytical chemistry chemistry.chemical_element Halide 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Chloride 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Sodium bromide chemistry.chemical_compound General Energy chemistry Bromide medicine Nanorod Physical and Theoretical Chemistry Surface plasmon resonance 0210 nano-technology medicine.drug |
| Zdroj: | The Journal of Physical Chemistry C. 120:20604-20612 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | A spectroelectrochemical flow cell is used to probe the localized surface plasmon resonance (LSPR) of the same single gold nanorods (AuNRs) in sodium fluoride, sodium chloride, and sodium bromide electrolytes using dark-field scattering microscopy. The changes in resonance energy, line width (full-width at half-maximum, fwhm), and peak intensity of a Lorentzian fit to single AuNR scattering spectra as the rods are charged are compared to determine the role of anion adsorption. We demonstrate that at positive potentials up to +0.25 V relative to a Pt quasi-reference electrode, the induced changes in the LSPR are independent of halide anion. At more positive potentials (+0.3 to +0.35 V) bromide and chloride ions damp the AuNR LSPR, observed as an increase in the line width. At the most positive potential investigated in all three electrolyte solutions (+0.35 V), the AuNR scattering intensity decreases irreversibly in bromide electrolyte, indicating dissolution. The kinetics of the bromide-mediated dissoluti... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|