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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals
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Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals

机译：纯和掺钕的CeO2-y纳米晶体中的等离振子-声子耦合的红外研究

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摘要

Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.
机译：通过在室温下测量100-700 cm（-1）光谱范围内的远红外反射光谱研究了纯净和Nd掺杂的CeO2-y纳米晶体中的等离子-纵-光（LO）声子相互作用。对所得结果的分析表明，随着粒径减小至纳米范围和晶格缺陷增加，自由电荷载流子的存在变得显着。发现自由电荷载流子负责等离子体激元模式，该等离子体激元模式与二氧化铈的两个LO声子模式强烈耦合。 Nd掺杂的CeO2-y纳米晶体中更明显的低频Drude尾部的存在和声子模的筛选表明，Plasmon-LO声子相互作用随掺杂而增加。应用分解和加法介电函数模型推导了纯Nd掺杂CeO2-y纳米晶体中LO声子频率的耦合和解耦以及解耦等离子体激元模的结构。这些模型与Bruggeman有效介质逼近相结合，以正确描述孔隙率对红外反射光谱的影响。随着掺杂剂含量的增加，解耦的等离激元模式表现出红移和阻尼降低，这意味着发生了掺杂引起的半导体到金属态的转变。

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