Spectrally tunable infrared plasmonic F,Sn:In2O3 nanocrystal cubes
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 07, 2020
- Source ID
- 10.1063/1.5139050
Entities
People
- Brian Korgel
- Chandriker Kavir Dass
- Delia Milliron
- Jordan A Hachtel
- Joshua R Hendrickson
- Jungchul Noh
- Junho Choi
- Karen Xie
- Kevin M. Roccapriore
- Kihoon Kim
- Lauren C. Reimnitz
- Sandeep Ghosh
- Shin Hum Cho
- Sungyeon Heo
- Xiaoqin Li
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Fulbright Association
- National Science Foundation
- Oak Ridge National Laboratory
- Princeton University
- Robert A. Welch Foundation
- United States Department of Energy
- University of Texas at Austin