镀金或镀碳

你可以用导电胶将其与底部的金属部位接触，不就不存在不导电了

不导电造成的。

在低真空下，适合看这类导电性不好的样品
那LV低真空和 环境扫描电镜 是一样的么？同一概念不？

环扫的压力更深一些。

不会的啦我看

It is a very typical image with charging，with streaks and astigmatism like effect. You can try two methods

1. Find the Zero Point of Charge(ZPC), it is normally in low accelerating voltage. Fine adjustments of the SEM must be available. You need to know roughly in which range the ZPC falls in for your material. Then gradually decrease your bracket of of voltage to find ZPC. It might be time consuming. And may not be good for organic or plastic materials since their ZPC are low.

2. Coating (Carbon, Au, Pd-Au or even Cu). Make sure of the conductivity while maintain the thinest coating.

Good luck!

俩字，镀金

一起学习!!!