中文摘要：

制备出分散良好的电镜样品对准确观察纳米粉末的形貌和尺寸尤为重要。以导电类铂和不导电类钒酸钇纳米粉末为研究对象,分别采用直接固定法和铜网碳载膜固定法制备样品,并对比这两种方法对扫描电镜成像的影响。结果表明：采用铜网碳载膜固定制备法可以有效改善纳米粉末样品的分散性,杜绝纳米颗粒与导电胶发生溶合,易获得纳米粉末样品扫描电镜真实像,明显提高扫描电镜观察的准确性和检测效率。

英文摘要：

The preparation of well dispersed SEM samples is significantly important to the observation for the accurate morphology and particle sizes of nano-powder. In this study, conductive platinum and non-conductive yttrium vanadate were chosen as study objects. Direct fixing method and the fixing method using copper mesh with carbon supporting film were used to prepare SEM samples, respectively. The influences of the two methods on the observation results of SEM were investigated. The results showed that the fixing method using copper mesh with carbon supporting film can effectively improve the dispersion of nano-powders, and eliminate the possibility of the occurrence of fusion between nano-particles and conductive adhesive. It enables the accessibility to true SEM image of nano-powders, and improves the accuracy and the efficiency of SEM measurement.