SnO_2纳米棒阵列的制备及光学、场发射性能研究

Synthesis and optical field-emission property of SnO_2 nanorod arrays

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。

Different morphology SnO2 nanorod array were directly synthesized on stainless steel substrate by simple one-pot hydrothermal method. The structure, morphology, photoluminescence and field emission of samples were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, spectrophotometer and field emission testing device. XRD result indicated that samples on substrate belonged to tetragonal rutile structure. SEM and TEM results showed that large-area SnO2 nanorods grown vertically on the substrate with single crystal structure were obtained, but the size and morphology of nanorods changed with the reaction condition （A： needle-like, B： pencil- like）. The room temperature photoluminescence spectrum （PL） showed that three strong emissions peak appear at 367 rim, 392 rim, 419 nm respectively and the ratio of the UV emission peak to the visible emission peak was large, indicating the high crystallization quality. The field emission test results showed the field emission of two samples conduct through the electronic tunnel effect and the field emission performance of sample A was better than sample B.