物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1343-1348.doi: 10.3866/PKU.WHXB20100524

光化学与光谱 上一篇    下一篇

Zn2SnO4纳米材料制备及光致发光特性

赵传熙, 吴萍, 张丹莉, 陈荣, 池凌飞, 肖潭   

  1. 汕头大学物理系, 广东 汕头 515063
  • 收稿日期:2009-11-01 修回日期:2010-01-26 发布日期:2010-04-29
  • 通讯作者: 吴萍 E-mail:pwu@stu.edu.cn

Synthesis and Photoluminescence of Zn2SnO4 Nanomaterials

ZHAO Chuan-Xi, WU Ping, ZHANG Dan-Li, CHEN Rong, CHI Ling-Fei, XIAO Tan   

  1. Department of Physics, Shantou University, Shantou 515063, Guangdong Province, P. R. China
  • Received:2009-11-01 Revised:2010-01-26 Published:2010-04-29
  • Contact: WU Ping E-mail:pwu@stu.edu.cn

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摘要：

以ZnO、SnO2和活性炭的混合物为原料, 通过碳热还原热蒸发法无催化剂成功制备出Zn2SnO4纳米材料. 借助X射线衍射仪(XRD)、拉曼光谱和扫描电子显微镜(SEM)对样品物相和形貌进行了表征, 结果显示样品为面心立方结构的Zn2SnO4纳米链状棒, 同时含有少量的ZnO物相. 利用X射线光电子能谱(XPS)对Zn2SnO4样品表面各元素的化学状态及相互作用方式进行了测试, 结果表明: 样品中Zn和Sn分别是以+2价和+4价氧化态形式存在, 其中Zn 2p3/2电子有两个结合能, 分别来自ZnO和Zn2SnO4, Zn2SnO4中Sn4+占据不同的格点位置. 室温下光致发光谱(PL)结果显示, 样品在紫外区域(320-450 nm)和可见区域存在很强的发光带, 其中紫外区域的宽发光带, 经过高斯拟合可分为358和385 nm两个发光峰, 与同条件下制备得到的纯ZnO纳米材料发光谱比较, 确认358 nm发光峰是来自于Zn2SnO4的近带边复合发光.

关键词: 光致发光, Zn2SnO4纳米材料, 碳热还原热蒸发法, X射线光电子能谱

Abstract:

We synthesized Zn2SnO4 nanomaterials by the carbon-thermal evaporation method with Zn, SnO2 and C powder mixture, without using a catalyst, to investigate the controllable synthesis of Zn2SnO4 nanomaterials and to study their optical properties in the ultraviolet region. The structure, and morphology of the as-grown products were characterized by X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) was also used to study the type of binding of the elements onto the product surfaces. Results show that zinc and tin are in the +2 and +4 oxidation states, respectively. We detected two different Zn 2p3/2 binding energies and attributed these to ZnO and Zn2SnO4. The two binding energies of Sn 3d revealed that Sn4+ occupies two distinct sites in Zn2SnO4. Our measured photoluminescence spectrum (PL) at room temperature consists of a broad emission in the ultraviolet region (320-450 nm) and a strong emission in the visible region. The asymmetric ultraviolet emission band can be divided into two emission bands (358 and 385 nm). Compared with the PL spectrum of pure ZnO, the band centered at 358 nmis assigned to the near-band-emission of Zn2SnO4.

Key words: Photoluminescence, Zn2SnO4 nanomaterial, Carbon-thermal evaporation method, X-ray photoelectron spectroscopy