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采用简单的一步水热法直接在不锈钢基底上制备了不同形貌的SnO2纳米棒阵列。利用X射线衍射(XRD),扫描电镜(SEM)、透射电镜(TEM)、分光光度计、场发射装置对材料的结构、形貌、光致发光谱和场发射特性进行了表征。XRD结果表明不锈钢基底上制备的样品为四方晶系金红石结构。SEM和TEM结果表明不同的反应条件下都能够在基底上大面积的垂直生长单晶SnO2纳米棒阵列,但是形貌和尺寸发生了改变(A:针尖状,B:铅笔状)。室温下的光致发光光谱(PL)表明两种样品在367、392、419 nm处分别存在较强的发射峰,并且紫外光峰强与可见光峰强比值较大,说明样品的结晶质量较好。场发射测试结果表明:两种样品的场发射都是通过电子隧道效应进行的,且样品A的场发射性能优于样品B。
SnO2 nanorod arrays with different morphologies were prepared directly on a stainless steel substrate by a simple one-step hydrothermal method. The structure, morphology, photoluminescence spectra and field emission properties of the materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), spectrophotometer and field emission device. XRD results show that the sample prepared on the stainless steel substrate is tetragonal rutile structure. The SEM and TEM results show that monocrystalline SnO2 nanorod arrays can be grown vertically on a large area under different reaction conditions, but the morphology and size have been changed (A: needle-like, B: pencil). The photoluminescence spectra (PL) at room temperature show that the two samples have strong emission peaks at 367, 392, and 419 nm, respectively, and the ratio of the peak intensity of UV light to the peak intensity of visible light is larger, indicating that the crystal quality of the sample is better . The field emission test results show that the field emission of both samples is performed by electron tunneling, and the field emission performance of sample A is better than that of sample B.