CAJ | 학술논문

本文对晶粒尺寸在5nm-1μm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15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15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1040cm-1的表面振动峰和14个较弱的二阶振动模式.这些结果反映了纳米颗粒的微结构变化与颗粒尺寸和表面效应以及它们之间相互作用的信息.
본문대정립척촌재5nm-1μm범위적순ZrO2납미과립진행료랍만산사연구.제료ZrO2본정랍만진동봉외,환유궤개신적랍만진동모식피관찰도.아문적결과현시당납미과립척촌감소시,납미ZrO2과립적체상특정랍만봉변약,이유결함,표면화과립척촌인기적상관효응정강세.정립척촌재15납미좌우시인기체상랍만광보변화적림계척촌.정립척촌재15납미이하,기체상랍만봉발생관화화봉위이동,이급분별출현재위우1040cm-1적표면진동봉화14개교약적이계진동모식.저사결과반영료납미과립적미결구변화여과립척촌화표면효응이급타문지간상호작용적신식.
ZrO2 nano-crystalline grains sized in the range of 5 nm-1 μ m are systematically investigated using Raman spectroscopy. Besides ZrO2 fundamental modes, a few weak Raman modes are observed. Our results show that bulk properties of nano-ZrO2 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-ZrO2 below 15 nm. They are associated with microstructure change of nanograins, i.e. they reflect grain size, surface, and the interaction between nanograins.