氨水溶液制备ZnO纳米晶阵列的研究

以氨水和硝酸锌为前躯体，采用低温水溶液法在涂敷ZnO晶种层的玻璃衬底上外延生长了ZnO纳米棒晶阵列。应用SEM、TEM、SAED和XRD表征了ZnO纳米晶的形貌和结构。讨论了该组成体系水溶液法纳米棒外延生长的机理及其对棒晶形貌的影响。通过对水溶液pH值的原位二次调整，制备出了ZnO纳米管和表面绒毛状的棒晶阵列，基于生长机理探讨了它们的形成原因，为实现不同形貌ZnO纳米晶阵列的优化控制提供了可能的技术途径。结果表明，不同形貌的ZnO均属沿c轴择优取向的六方纤锌矿结构。

ZnO Nanocrystal Arrays Fabricated from Ammonia Solution System

Well-aligned crystalline ZnO nanorod arrays were fabricated via an aqueous solution route with zinc nitrate and ammonia as precursors. ZnO seed layers on glass substrates were firstly formed by dip-coating and heat treatment for subsequent epitaxial growth of ZnO nanorods. Morphologies and structures of ZnO nanocrystals were characterized by SEM, TEM, SAED and XRD. The growth mechanism of ZnO nanorod and its effect on rod morphology are discussed. ZnO nanotubes and nanorods with blanket-like surface were produced via in-situ secondary pH adjustment of solutions. The formation of nanotubes and nanorods with blanket-like surface are explained in terms of the growth mechanism. The results show that multiform ZnO nanocrystals are all hexagonal wurtzite structure preferentially oriented in c-axis direction.