水热法制备掺铝氧化锌纳米棒阵列及其光学特性

Preparation of Al-doped ZnO nanorod arrays by hydrothermal method and their optical properties

采用水热法,在ZnO种子层上制备出不同Al掺杂量的ZnO纳米棒阵列薄膜,利用XRD、SEM、TEM、PL等检测手段对样品进行结构、形貌和发光性能分析。结果表明,纳米棒属于六方纤锌矿结构,具有垂直基底沿[002]方向生长的特征,PL谱上存在强的近紫外辐射峰。随着掺杂量的增加,纳米棒直径略有减小,近紫外辐射峰蓝移,强度先增加后减小,证明掺杂会形成非辐射中心,探讨了Al掺杂ZnO纳米棒阵列的发光机理。

Al-doped ZnO nanorod arrays with different Al doping concentration were grown on ZnO seed layers by hydrothermal method. XRD, SEM, TEM, PL measurement were used to characterize the structure, morphology and optical properties of the samples. The results show that Al-doped ZnO nanorod belongs to hexagonal structure,and has a preferential （002） oriention with the e-axis perpendicular to the substrate surface. A strong UV emission is observed for all the samples. With the increase of Al doping concentration,the average diameter of the rods decreases, the UV peak position blue shifts, the intensity of the UV peak increases first, but then decreases,indicating the presence of nonradiative centers. The photoluminescence mechanism of the Al doping is discussed.