邻苯二酚螯合生长氧化锌棒状结构光致发光增强

Enhancement of photoluminescence of ZnO rod structure by catechol chelation

摘要:

通过水热合成方法，研究了邻苯二酚作为螯合剂对氧化锌（ZnO）一维棒状材料结构及其光致发光的作用. 实验发现，通过调节邻苯二酚的浓度，可以显著改变ZnO一维棒状材料的形貌特征与长径比. 结合XRD测试发现随着邻苯二酚的加入，ZnO一维棒状材料的晶化程度显著提高. 随着邻苯二酚加入量增大，ZnO晶体沿(100)面方向呈现择优生长的趋势，当邻苯二酚加入量为1g/L时，ZnO晶体晶化程度最高. 另外，光致发光光谱测试发现，ZnO一维棒状材料在紫外以及可见光波段均存在显著的光致发光增强. 结合ZnO一维棒状材料的形貌及物相分析，揭示了螯合剂引入后造成的ZnO材料表面缺陷量与晶化程度对光致发光增强的影响. 本工作不仅揭示了邻苯二酚在ZnO材料生长中的螯合作用，同时通过邻苯二酚加入量的调控进一步提高了ZnO的光致发光性能.

Abstract:

The effect of catechol as chelating agent is used to study the structures and photoluminescence of ZnO one dimensional rod like materials by hydrothermal methods. We find that the morphologies and length to diameter ratio are depended on the concentration of catechol. The XRD test show that the crystallization degree of ZnO one dimensional rod like materials increases remarkably with the addition of catechol. By increasing the amount of catechol, the ZnO crystal exhibits preferential growth along (100) direction. When the amount of catechol reaches 1g/L, the crystalline degree of ZnO crystal shows the highest degree of crystallization. In addition, the photoluminescence test shows that ZnO one dimensional rod like materials exhibits strong photoluminescence enhancement around UV-vis spectroscopy. In combination with morphology and phase analysis, the influences of the crystallization and surface defects of ZnO materials on the photoluminescence enhancement are revealed. This work reveals the chelating effect of catechol on the growth of ZnO materials and improves the photoluminescence properties of ZnO by modulating the quantity of catechol.