Korepanov Vitaly I, Chan Si-Yuan, Hsu Hsu-Cheng, Hamaguchi Hiro-O
Institute of Microelectronics Technology and High Purity Materials, RAS, Chernogolovka 142432, Russia.
Department of Photonics, National Cheng Kung University, Tainan 700, Taiwan.
Heliyon. 2019 Feb 19;5(2):e01222. doi: 10.1016/j.heliyon.2019.e01222. eCollection 2019 Feb.
We study Raman spectra of ZnO nanoparticles of 5-12 nm size in the whole range of the first-order phonon bands. We apply the 3D phonon confinement model (PCM) for the interpretation of the observed Raman spectra. It is found that PCM is well applicable to the acoustic modes as well as to the optical ones, despite the fact that PCM has been thought not to be suitable for acoustic phonons. We show that the asymptotic behavior of PCM for the small-size limit is more consistent with the observation than that of the elastic sphere model (ESM). Furthermore, PCM gives detailed information on the complex size-dependent shapes of the phonon bands.
我们研究了尺寸在5 - 12纳米范围内的ZnO纳米颗粒在一阶声子带整个范围内的拉曼光谱。我们应用三维声子限制模型（PCM）来解释所观察到的拉曼光谱。结果发现，尽管人们认为PCM不适用于声学声子，但它对于声学模式和光学模式都非常适用。我们表明，在小尺寸极限下，PCM的渐近行为比弹性球模型（ESM）的更符合观测结果。此外，PCM给出了关于声子带复杂的尺寸依赖形状的详细信息。
