Spectrally tunable infrared plasmonic F,Sn:In2O3 nanocrystal cubes
- Authors
- Cho, Shin Hum; Roccapriore, Kevin M.; Dass, Chandriker Kavir; Ghosh, Sandeep; Choi, Junho; Noh, Jungchul; Reimnitz, Lauren C.; Heo, Sungyeon; Kim, Kihoon; Xie, Karen; Korgel, Brian A.; Li, Xiaoqin; Hendrickson, Joshua R.; Hachtel, Jordan A.; Milliron, Delia J.
- Issue Date
- Jan-2020
- Publisher
- AMER INST PHYSICS
- Citation
- JOURNAL OF CHEMICAL PHYSICS, v.152, no.1
- Journal Title
- JOURNAL OF CHEMICAL PHYSICS
- Volume
- 152
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80231
- DOI
- 10.1063/1.5139050
- ISSN
- 0021-9606
- Abstract
- A synthetic challenge in faceted metal oxide nanocrystals (NCs) is realizing tunable localized surface plasmon resonance (LSPR) near-field response in the infrared (IR). Cube-shaped nanoparticles of noble metals exhibit LSPR spectral tunability limited to visible spectral range. Here, we describe the colloidal synthesis of fluorine, tin codoped indium oxide (F,Sn:In2O3) NC cubes with tunable IR range LSPR for around 10 nm particle sizes. Free carrier concentration is tuned through controlled Sn dopant incorporation, where Sn is an aliovalent n-type dopant in the In2O3 lattice. F shapes the NC morphology into cubes by functioning as a surfactant on the {100} crystallographic facets. Cube shaped F,Sn:In2O3 NCs exhibit narrow, shape-dependent multimodal LSPR due to corner, edge, and face centered modes. Monolayer NC arrays are fabricated through a liquid-air interface assembly, further demonstrating tunable LSPR response as NC film nanocavities that can heighten near-field enhancement (NFE). The tunable F,Sn:In2O3 NC near-field is coupled with PbS quantum dots, via the Purcell effect. The detuning frequency between the nanocavity and exciton is varied, resulting in IR near-field dependent enhanced exciton lifetime decay. LSPR near-field tunability is directly visualized through IR range scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS). STEM-EELS mapping of the spatially confined near-field in the F,Sn:In2O3 NC array interparticle gap demonstrates elevated NFE tunability in the arrays. Published under license by AIP Publishing.
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