纳微氧化锌形貌演变过程的实验和模拟研究  

Experimental and simulation study on the morphology evolution of zinc oxide nano/microstructures

作　　者：田会娟 孟君[1] 赵玥[1] 洪岩 TIAN Hui-juan;MENG Jun;ZHAO Yue;HONG Yan(School of New Material and Chemical Engineering,Tangshan University,Tangshan 063000,China;Qian'an Hongao Industry and Trade Co.,LTD.,Qian'an 063000,China)

机构地区：[1]唐山学院新材料与化学工程学院,河北唐山063000 [2]迁安市宏奥工贸有限公司,河北迁安063000

出　　处：《化学研究与应用》2023年第11期2765-2770,共6页Chemical Research and Application

基　　金：唐山市科技局项目(21130232C)资助。

摘　　要：利用热蒸发锌粉法在水平管式炉中成功生长出了纳微结构氧化锌。研究了不同的O_(2)/N2流量下,锌源上、下游氧化锌形貌的演变过程。采用扫描电子显微镜(SEM)、X-射线衍射(XRD)和拉曼光谱等对产物形貌和结构进行了表征。制备的纳微氧化锌具有六方纤锌矿结构,纯度高,结晶好。当保持O_(2)流量为0.25 sccm,O_(2)和N2的总流量分别为100 sccm、200 sccm和400 sccm时,上游产物形貌为钉状且钉帽尺寸逐渐减小,而产物形貌分别为多足、铅笔和针状。当保持总流量为400 sccm,随着O_(2)流量的增加,上游的钉状氧化锌的钉帽变大,下游针状氧化锌的顶部直径变粗,长度变长。计算流体动力学模拟结果表明:纳微氧化锌的形貌演变过程与Zn蒸汽和O_(2)的反应速率决定相关。ZnO nano/microstructures were successfully grown in a horizontal tube furnace by thermal evaporation of zinc powder.The morphological evolution of ZnO nano/microstructures was studied under variable O,/N,flow ratios at both upstream and down-stream.The morphology and structure of the products were characterized by SEM,XRD and Raman spectroscopy.The prepared ZnO nano/microstructures are hexagonal wurtzite structure,with high purity and good crystallization.When the O,flow rate was 0.25 sc-cm and the total flow rates were changed from 100 sccm to 400 sccm,the size of the nail caps gradually decreased at upstream and the morphologies of downstream products were mutipod,pencil and needle,respectively.When the total flow rate was 400 sccm,the caps of the nail-like ZnO became larger with increasing O,flow rate at upstream and the diameters at the top of products became thicker and the length became longer at downstream.Computational fluid dynamics simulation indicates that the morphological evo-lution of the ZnO nanostructures result from the reaction rate of zinc vapor and O_(2).

关 键 词：纳微氧化锌 热蒸发 形貌演变 计算流体动力学 反应速率 

分 类 号：O614.2[理学—无机化学]