He said his team used a metallic substrate simply because it's necessary in order to produce scanning tunnelling microscope images.

他还说他的小组选用金属只是出于制作扫描隧道显微镜图片的需要。

The surface structure of Polymeric 1 Cyano 3 Phenyl Urea(PCPU) film has been studied by scanning tunnelling microscope (STM) under ambient conditions.

本文利用大气中扫描隧道显微镜对新型有机功能材料腈基-苯基-脲（CPU）的聚合物（PCPU）薄膜进行了研究。