期刊
NANO LETTERS
卷 20, 期 4, 页码 2821-2828出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00542
关键词
Mid-infrared plasmonics; cadmium oxide; nonstoichiometry; self-doping
类别
资金
- Indiana University
- Indiana University Collaborative Research Grants (IUCRG) program
- IU-MSI STEM Initiative Seed Grant
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NIU start-up fund
- National Key Research and Development (R&D) Program of China [2016YFA0202402]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- National Postdoctoral Program for Innovative Talents [BX201600113]
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 similar to 6.0 mu m 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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