籽晶层制备方式对氧化锌纳米棒阵列的影响

采用3种不同的方式制备ZnO薄膜籽晶层:旋涂、喷雾热解和脉冲激光沉积。对于每一种制备方式,其薄膜的晶体结构、形貌、表面粗糙度等性能分别用X射线衍射(XRD)、扫描电子显微镜(SEM)和原子力显微镜(AFM)进行了表征。之后,通过水热合成方法,在3种籽晶层衬底上制备得到具有不同结构和形貌特征的ZnO纳米棒阵列。结果表明,ZnO纳米棒生长和籽晶层制备方式具有极强的相关性。最后,对两者相关性的生长机理进行了解释。

Seed-Layer Effect on Highly Oriented ZnO Nanorod Array Fabrication

Vertically aligned ZnO nanorod arrays have been extensively applied to the fabrication of various optoelectronic devices owing to their versatile properties. However, to control and investigate the morphology of nanorods is directly related to device performances. A seeded substrate is favourable for the hydrothermal synthesis of nanorods by lowering the nucleation barrier and restricting the migration of the disordered nucleation. Therefore, varying the seed layer properties is a feasible and effective way to control the nanorod growth. In this paper, three different methods sol-gel, spray pyrolysis and pulse laser deposition (PLD) were employed to the ZnO seed layer preparation. For each preparation method, the crystal structure, morphologies, surface roughness and properties of ZnO seed layers were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. ZnO nanorod arrays with different structures and morphological properties were synthesised on the prepared seed layers by hydrothermal treatment. The ZnO nanorods exhibit strong substrate-dependent properties. Combined with the characteristics of ZnO seed layers, the difference of growth mechanisms for each method is proposed by analyzing the nanorod properties on the seed layers.