不同退火温度的ZrO_2 纳米颗粒光学声子和表面吸附分子的拉曼散射研究(英文)  

Raman Scattering Studies of Annealing Temperature Dependence of Optical Phonons and Surface Adsorbed Molecular Vibrations in ZrO_2 Nanograins

作　　者：刘玉龙[1] 丁硕[1] 朱恪[1] 萧季驹[2] 

机构地区：[1]中科院物理研究所,北京100080 [2]香港城市大学

出　　处：《光散射学报》2005年第1期1-3,共3页The Journal of Light Scattering

摘　　要：本文对晶粒尺寸在5nm 1 μm范围的纯ZrO2 纳米颗粒进行了拉曼散射研究。除了ZrO2 本征拉曼振动峰外,还有几个新的拉曼振动模式被观察到。我们的结果显示当纳米颗粒尺寸减少时,纳米ZrO2 颗粒的体相特征拉曼峰变弱,而由缺陷,表面和颗粒尺寸引起的相关效应呈强势。晶粒尺寸在1 5纳米左右是引起体相拉曼光谱变化的临界尺寸。晶粒尺寸在1 5纳米以下,其体相拉曼峰发生宽化和峰位移动,以及分别出现在位于1 0 40cm- 1的表面振动峰和1 4个较弱的二阶振动模式。ZrO_2 nano-crystalline grains sized in the range of 5 nm-1 μ m are systematically investigated using Raman spectroscopy. Besides ZrO_2 fundamental modes, a few weak Raman modes are observed. Our results show that bulk properties of nano-ZrO_2 diminish but the defect-, surface-, and size-related features display as grain size decreases. A critical size that divides respective predominance is determined to be about 15 nm. General mode softening, a surface mode around 1040 cm^(-1) and 14 weak second-order modes are characteristics of Raman spectra of nano-ZrO_2 below 15 nm. They are associated with microstructure change of nanograins, i.e. they reflect grain size, surface, and the interaction between nanograins.

关 键 词：纳米ZRO2 拉曼光谱 分子的吸附 二阶振动模式 

分 类 号：O657.37[理学—分析化学]