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Electrodissolution Inhibition of Gold Nanorods with Oxoanions

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [2];  [2];  [3];  [3]
  1. Rice Univ., Houston, TX (United States); Rice University
  2. Rice Univ., Houston, TX (United States)
  3. Rice Univ., Houston, TX (United States). Lab. for Nanophotonics, Dept. of Electrical and Computer Engineering

Metal nanoparticles experience varied chemical environments that can cause corrosion and dissolution in electronics, electrocatalysis, and sensing applications. Understanding oxidative dissolution is important for plasmonic nanoparticles because their optical properties strongly depend on size and shape. Here, we demonstrate that the addition of low relative concentrations of oxoanions to aqueous halide electrolyte solutions improves the morphological stability of plasmonic gold nanorods at anodic electrochemical potentials that otherwise induce complete oxidative electrodissolution. Single particle hyperspectral dark-field imaging and correlated scanning electron microscopy show that oxoanions alter the electrodissolution onset potential, electrodissolution pathway, and nanoparticle reaction heterogeneity, as compared to chloride-only electrolyte solutions. We identify five mechanistic contributors to the corrosion inhibition capabilities of oxoanions in the presence of chloride ions, with the aim of expanding the range of electrochemical sensing and catalysis applications for plasmonic metal nanoparticles. Of the contributors investigated, the pH, adsorption potential, and ionicity of the oxoanion are found to be the most influential factors, supporting the superior corrosion inhibition observed with bicarbonate and phosphate.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Robert A. Welch Foundation
Grant/Contract Number:
SC0016534
OSTI ID:
1596098
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 22 Vol. 123; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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