Abstract
Thin films of nanoporous gold (NP-Au) have been extensively studied for localized surface plasmon resonance [1,2], showing a strong structure-property relationship between the morphology of the porous network and resonant frequencies. In this talk, I will show how we take advantage of this structure-property relationship and use UV-Visible optical spectroscopy to study the morphology evolution in NP-Au thin films in situ during selective electrolytic leaching of the sacrificial Ag from Au-Ag parent alloy. The evolution of plasmon resonance frequencies obtained from in situ UV-Vis spectra are directly linked to the morphology evolution (development of pores and changes in structure size) and the chemical composition (change in Ag content) in NP-Au, as confirmed by ex situ electron microscopy data.[1] A. Pröschel, J. Chacko, R. Whitaker, M. A. U Chen, and E. Detsi: Journal of The Electrochemical Society 166, H146-H150 (2019).[2] E. Detsi, M. Salverda, P.R. Onck and J.T.M. De Hosson:Journal of Applied Physics 115, 044308 (2014)
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