Broadband Tunable Mid-infrared Plasmon Resonances in Cadmium Oxide Nanocrystals Induced by Size-Dependent Nonstoichiometry
| Autor: | Zeke Liu, Cheng-Jun Sun, Yaxu Zhong, Xingchen Ye, Hoai T Nguyen, Yaroslav Losovyj, Jun Chen, Soojin Jeong, Wanli Ma, Tao Li, Liguang Wang, Ibrahim Shafei, Xinfeng Gao, Lei Chen |
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| Rok vydání: | 2020 |
| Předmět: |
Free electron model
Materials science business.industry Mechanical Engineering Doping Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Wavelength chemistry.chemical_compound Nanocrystal chemistry Cadmium oxide Optoelectronics General Materials Science 0210 nano-technology business Plasmon Stoichiometry Localized surface plasmon |
| Zdroj: | Nano Letters. 20:2821-2828 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.0c00542 |
| Popis: | A central theme of nanocrystal (NC) research involves synthesis of dimension-controlled NCs and studyof size-dependent scaling laws governing their optical, electrical, magnetic, and thermodynamic properties. Here, we describe the synthesis of monodisperse CdO NCs that exhibit high quality-factor (up to 5.5) mid-infrared (MIR) localized surface plasmon resonances (LSPR) and elucidate the inverse scaling relationship between carrier concentration and NC size. The LSPR wavelength is readily tunable between 2.4 and ∼6.0 μm by controlling the size of CdO NCs. Structural and spectroscopic characterization provide strong evidence that free electrons primarily originate from self-doping due to NC surface-induced nonstoichiometry. The ability to probe and to control NC stoichiometry and intrinsic defects will pave the way toward predictive synthesis of doped NCs with desirable LSPR characteristics. |
| Databáze: | OpenAIRE |
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