Journal
NANO LETTERS
Volume 20, Issue 10, Pages 7498-7505Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02992
Keywords
colloidal nanoparticles; localized surface plasmon resonance; effective medium; dielectric function; sensor
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Funding
- National Science Foundation (NSF) [CHE-1905263]
- NASCENT, an NSF ERC [EEC-1160494]
- Graduate Research Fellowship [DGE-1610403]
- Welch Foundation [F-1848]
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When aliovalent dopants are sufficiently segregated to the core or near the surface of semiconductor nanocrystals, charge carriers donated by the dopants are also segregated to the core or near the surface, respectively. In Sn-doped indium oxide nanocrystals, we find that this contrast in free charge carrier concentration creates a core and shell with differing dielectric properties and results in two distinctly observable plasmonic extinction peaks. The trends in this dual-mode optical response with shell growth differ from core/shell nanoparticles composed of traditional plasmonic metals such as Au and Ag. We developed a model employing a core/shell effective medium approximation that can fit the dual-mode spectra and explain the trends in the extinction response. Lastly, we show that dopant segregation can improve sensitivity of plasmon spectra to changes in refractive index of the surrounding environment.
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