Synthesis and Photoluminescence Properties of 3-D Flower-like ZnO Nanomaterials

KeyWord:flower-like  ZnO  nanorod  photoluminescence spectrum

Abstract:

      Under ordinary pressure£¬3-D flower-like ZnO nanomaterials were successfully synthesized by two steps of sol-gel and chemical solution growth methods with three different substrates.The samples were characterized by means of X-ray diffraction£¨XRD£©,scanning electron microscopy£¨SEM£©£¬transmission electron microscopy£¨TEM£©£¬selected-area electron diffraction£¨SAED£©£¬ultraviolet absorption spectroscopy and photoluminescence spectrum£¨PL£©.The results indicated that the component units of flower-like ZnO were ZnO nanorods grown along the c-axis.The diameter and length of nanorods were approximately 100 nm and 2 ¦Ìm,respectively.Different substrates had little effect on the morphology of flower-like ZnO and the solution pH value had great influence on the formation of flower-like ZnO.The ultraviolet absorption spectrum and photoluminescence spectrum of 3-D flower-like ZnO nanomaterials indicated that the nanomaterials produced a strong broadband absorption in ultraviolet area£¬a strong blue emission at 421 nm and two weak green emissions at 520 nm and 560 nm.Therefore£¬this flower-like ZnO could be used to make the blue light emitting devices.