氧化锌纳米棒/云母复合粉体的合成、表征及红外发射性能  

Preparation,Characterization and Infrared Emissivity of ZnO Nanorod/Mica Composites

作　　者：蔡伟炜[1] 杨辉[1] 郭兴忠[1] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027

出　　处：《无机化学学报》2014年第2期229-234,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家支撑计划项目(No.2012BAJ20B03)资助项目

摘　　要：采用液相沉积法制备了氧化锌（ZnO）纳米棒负载云母复合粉体，其合成工艺分为：（1）云母粉体表面沉积ZnO纳米粒子，并经煅烧制得表面晶种化的云母粉体；（2）以七水硫酸锌（ZnSO4·7H2O）为前驱体，乙醇胺和氨水为络合剂，制得液相沉积前驱体溶液，并在晶种化的云母粉体表面沉积ZnO纳米棒。利用X-射线衍射（XRD）、ζ电位仪、扫描电子显微镜（SEM）以及红外发射率测试仪对氧化锌/云母复合粉体进行了测试与表征。结果表明，云母分散于乙醇水体积比为1：1的混合溶液中，其表面带负电（-37 mV），而ZnO粒子表面则带正电（16 mV）；两种粒子混合时，可通过静电引力实现ZnO纳米粒子在云母表面沉积；随着云母表面ZnO纳米棒沉积密度的增大，复合粉体在8~14 μm波段内的红外发射率逐渐增大，从0.800增加至0.863；对比棒状ZnO球体，结构单元聚集状态的变化对最终红外发射性能的影响不大。ZnO nanorod/Mica composite powders were successfully fabricated with chemical liquid deposition （CLD）. The composite powder consisting of mica and ZnO nanorod was fabricated via a two-step process： （1） The ZnO colloid particles were absorbed on the surface of sheetlike mica particles via electrostatic interaction, and then heat-treatment was used to attain mica particles with ZnO nanocrystals loaded on the surface; （2） Precursor solution prepared with zinc sulfate heptahydrate, ethanolamine and ammonia was used to load ZnO nanorods on the surface of mica. The resultant composite particles were characterized by XRD, Zeta potential analyzer, scanning electron microscope （SEM） and spectral radiometer. The results showed that the ζ potential of mica in the ethanol/water solution （1：1, V/V） was -37 mV, while the ζ potential of ZnO colloidal particles was 16 mV. Thus the ZnO colloidal particles can be absorbed on the surface of mica particles via electrostatic interaction. As increased deposition density of ZnO nanorod on the surface of mica particles, the emissivity of the particles in 8~14 μm region increased from 0.800 to 0.863. Compared with the rodlike ZnO particles, the aggregation of structural unit had no obvious effect on the infrared emissivity of the particles.

关 键 词：氧化锌 云母 复合粉体 红外发射率 

分 类 号：TB34[一般工业技术—材料科学与工程]