Synthesis of ZnO flowers and their photoluminescence properties
Synthesis of ZnO flowers and their photoluminescence properties
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DOI：
10.1016/j.materresbull.2007.07.025
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发表时间：
2008-07
影响因子：
5.4
通讯作者：
Changle Wu;X. Qiao;Langli Luo;Haijun Li
中科院分区：
文献类型：
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作者：
Changle Wu;X. Qiao;Langli Luo;Haijun Li
以Zn（NH3）42+为前驱体，氨水为结构导向剂，在水溶液中通过热处理合成了花状ZnO纳米/微米结构。采用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、热分析和光致发光（PL）等技术对ZnO结构进行了表征。光致发光（PL）测试表明，在320 nm的He-Gd激光激发下，所合成的ZnO结构呈现出紫外（λ 375 nm）、蓝光（λ 465 nm）和黄光（λ 585 nm）发射带。此外，在空气中600°C退火3 h后，ZnO纳米晶在λ 585 nm处的发光强度显著降低。其原因可能是高温下样品中可能存在的氧空位和介电常数减少。
Flower-like ZnO nano/microstructures have been synthesized by thermal treatment of Zn(NH3)42+precursor in aqueous solvent, using ammonia as the structure directing agent. A number of techniques, including X-ray diffraction (XRD), field emission scan electron microscopy (FESEM), transmission electron microscopy (TEM), thermal analysis, and photoluminescence (PL) were used to characterize the obtained ZnO structures. The photoluminescence (PL) measurements indicated that the as-synthesized ZnO structures showed UV (∼375nm), blue (∼465nm), and yellow (∼585nm) emission bands when they were excited by a He–Gd laser using 320nm as the excitation source. Furthermore, it has been interestingly found that the intensity of light emission at ∼585nm remarkably decreased when the obtained ZnO nanocrystals were annealed at 600°C for 3h in air. The reason might be the possible oxygen vacancies and interstitials in the sample decreased at high temperature.