Liu Zeke, Zhong Yaxu, Shafei Ibrahim, Jeong Soojin, Wang Liguang, Nguyen Hoai T, Sun Cheng-Jun, Li Tao, Chen Jun, Chen Lei, Losovyj Yaroslav, Gao Xinfeng, Ma Wanli, Ye Xingchen
Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou 215123, Jiangsu China.
Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States.
Nano Lett. 2020 Apr 8;20(4):2821-2828. doi: 10.1021/acs.nanolett.0c00542. Epub 2020 Mar 10.
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.
纳米晶体（NC）研究的一个核心主题涉及尺寸可控的纳米晶体的合成以及对支配其光学、电学、磁学和热力学性质的尺寸相关缩放定律的研究。在此，我们描述了具有高品质因数（高达5.5）的中红外（MIR）局域表面等离子体共振（LSPR）的单分散CdO纳米晶体的合成，并阐明了载流子浓度与纳米晶体尺寸之间的反比缩放关系。通过控制CdO纳米晶体的尺寸，LSPR波长可在2.4至约6.0μm之间轻松调谐。结构和光谱表征提供了有力证据，表明自由电子主要源于纳米晶体表面诱导的非化学计量比导致的自掺杂。探测和控制纳米晶体化学计量比及固有缺陷的能力将为具有理想LSPR特性的掺杂纳米晶体的预测合成铺平道路。
