Broadband Tunable Mid-infrared Plasmon Resonances in Cadmium Oxide Nanocrystals Induced by Size-Dependent Nonstoichiometry | Zendy

Zeke Liu | Zendy; Yaxu Zhong | Zendy; Ibrahim H. Shafei | Zendy; Soojin Jeong | Zendy; Liguang Wang | Zendy; Thi Thu Hoai Nguyen | Zendy; ChengJun Sun | Zendy; Tao Li | Zendy; Jun Chen | Zendy; Lei Chen | Zendy; Yaroslav Losovyj | Zendy; Xinfeng Gao | Zendy; Wanli Ma | Zendy; Xingchen Ye | Zendy

Open Access

Broadband Tunable Mid-infrared Plasmon Resonances in Cadmium Oxide Nanocrystals Induced by Size-Dependent Nonstoichiometry

Author(s) -

Zeke Liu,

Yaxu Zhong,

Ibrahim H. Shafei,

Soojin Jeong,

Liguang Wang,

Thi Thu Hoai Nguyen,

ChengJun Sun,

Tao Li,

Jun Chen,

Lei Chen,

Yaroslav Losovyj,

Xinfeng Gao,

Wanli Ma,

Xingchen Ye

Publication year - 2020

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.0c00542

Subject(s) - cadmium oxide , nanocrystal , surface plasmon resonance , plasmon , materials science , doping , infrared , free electron model , stoichiometry , surface plasmon , nanotechnology , wavelength , chemical physics , nanoparticle , optoelectronics , electron , chemistry , optics , cadmium , physics , quantum mechanics , metallurgy

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.

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