Abstract
We report on the use of a spectroelectrochemical method for the investigation of mercury amalgamation on gold nanorods. Hg2+ was electrochemically reduced at gold nanorod electrodes, and the consequent optical changes resulting from deposition of mercury were monitored by dark-field microscopy. Nanorods displayed marked scattering color transitions from red to green and longitudinal surface plasmon resonance (LSPR) blue-shifts up to 197 nm. Corresponding cathodic voltammograms showed strong reduction peaks at potentials which were attributed to Hg2+ reduction. The highest optical blue-shifts were observed for working electrodes constituted by well-separated gold nanorods deposited on ITO substrates, which also showed transition from diffusion-limited to steady-state electrochemical behavior. Theoretical simulations were carried out to support experimental results and to obtain further insight into the diffusional behavior of mercury reduction at nanorod electrodes. Real time observation of the amalgamatio...
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