单晶ZnO六棱锥的PEG400辅助热分解合成及其光致发光性能

摘要

将由Zn(CH3COO)2·2H2O和Na2CO3通过室温研磨反应获得的前驱体在PEG400存在下于240℃热分解获得大量的ZnO六棱锥产物.用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM)表征产物的晶体结构和形貌.进步的实验结果表明:PEG400在ZnO六棱锥形成过程中发挥着重要作用,单六棱锥和双六棱锥的结构差异来自于热分解反应.光致发光谱(PL)测试表明:ZnO六棱锥在386 nm处展示强的近带隙发射,在550 nm处展示较弱的绿光发射.435 cm-1处的拉曼振动表明ZnO六棱锥具有良好的晶体质量.%Large-scale synthesis of ZnO hexagonal pyramids was achieved by a simple thermal decomposition route of precursor at 240 ℃ in the presence of PEG400.The precursor was obtained by room-temperature solid-state grinding reaction between Zn(CH3COO)2·2H2O and Na2CO3· Crystal structure and morphology of the products were analyzed and characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM).The results of further experiments show that PEG400 has an important role in the formation of ZnO hexagonal pyramids.Difference between the single and double hexagonal pyramid structure may come from the special thermal decomposition reaction.The photoluminescence (PL) spectra of ZnO hexagonal pyramids exhibit strong near-band-edge emission at about 386 nm and weak green emission at about 550 nm.The Raman-active vibration at about 435 cm-1 suggests that the ZnO hexagonal pyramids have high crystallinity.