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Plasmon enhanced electrochemical dissolution of gold nanorods

Hoener, Benjamin and Collins, Sean and Kirchner, Silke and Wang, Wenxiao and Jebeli, Seyyed Ali and Joplin, Anneli and Chang, Wei-Shun and Link, Stephan and Landes, Christy (2018) Plasmon enhanced electrochemical dissolution of gold nanorods. In: 255th American Chemical Society National Meeting & Exposition, March 18-22, 2018, New Orleans, LA.

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Plasmonic nanoparticles have been proposed as active and selective electrocatalysts due to local heating and hot carrier generation through local surface plasmon resonance (LSPR) excitation. The electrochem. stability of gold nanoparticles based on size and crystal structure has been extensively studied in halide solns. However, under light excitation in addn. to electrochem. potential the same plasmonic effects that enhance catalytic activity may make the nanoparticles less stable and dissolve at lower electrochem. potentials. In this work we study single plasmonic gold nanorods (AuNRs) at various electrochem. potentials with and without white light laser (WLL) excitation in an aq. chloride electrolyte soln. As electrochem. potential was increased, AuNR dissoln. was tracked by changes in the LSPR scattering spectra and confirmed with correlated SEM. WLL excitation produced heterogeneous dissoln., some AuNRs dissolved at much lower potential under WLL excitation and at a greater rate. Wavelength dependent measurements showed that longitudinal plasmon mode excitation was primarily responsible for the laser mediated AuNR dissoln. enhancements. As local heating effects were minimal at the laser power densities used in these expts., the plasmon enhanced dissoln. is best explained by a hot hole driven dissoln. mechanism.

Item Type:Conference or Workshop Item (Paper)
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Additional Information:© 2018 American Chemical Society.
Record Number:CaltechAUTHORS:20180712-080855862
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87796
Deposited By: Tony Diaz
Deposited On:12 Jul 2018 16:06
Last Modified:03 Oct 2019 19:59

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