Rationalizing the Impact of Surface Depletion on Electrochemical Modulation of Plasmon Resonance Absorption in Metal Oxide Nanocrystals

• DOI: 10.1021/acsphotonics.7b01587
• Publication Date: 2018-03-21T11:47:21Z
• Authors: Ankit Agrawal; Ilka Kriegel; Evan L. Runnerstrom; Francesco Scotogn...; Anna Llordes; Delia J. Milliron
• Keywords: Indium tin oxide

Dynamic control over the localized surface plasmon resonance (LSPR) makes doped metal oxide nanocrystals (NCs) promising for several optoelectronic applications including electrochromic smart windows and redox sensing. Metal NCs such as tin-doped indium display tunable infrared LSPRs via electrochemical charge injection extraction a function of externally applied potential. In this work we have employed dispersion phase charging/discharging to study mechanism behind optical modulation on an individual NC scale. The LSPR is dominated by sharp variation in intensity during reduction oxidation along with only modest shift frequency. With core–shell modeling approach, which active core surrounded depleted shell assumed, were able reproduce trends main features our experimental results. thickness depends potential extracted temporal evolution together Drude parameters until equilibrium was reached. versus volume fraction reinforces importance depletion layer highly uncovers important implications their near far field plasmonic properties.