第3楼2004/11/18
总的来说SPM利大于弊:
1、具有原子级高分辨率,可以分辨出单个原子。
2、可实时得到在实空间中表面的真正三维图像,可用于具有周期性或不具备周期性的表面结构研究,这种可实时观测的性能可用于表面扩散等动态过程的研究。
3、可观察单个原子层的局部表面结构。
4、可在真空、大气、常温等不同环境下工作,样品甚至可浸在水和其他溶液中。不需要特别的制样技术并且探测过程对样品无损伤。
5、配合扫描隧道谱可以得到有关表面电子结构的信息。
6、利用STM针尖,可以对原子和分子进行操作。
纵使有许多优点,缺点也不可避免,但是短短二十载就能发展至此也相当不易。对于人类认识自然是一个必不可少的工具。
第10楼2005/10/11
The main disadvantage that the AFM has compared to the scanning electron microscope (SEM) is the image size. The SEM can show an area on the order of millimetres by millimetres and a depth of field on the order of millimetres. The AFM can only show a maximum height on the order of micrometres and a maximum area of around 100 by 100 micrometres. Additionally, the AFM cannot scan images as fast as an SEM. It may take several minutes for a typical region to be scanned with the AFM, however an SEM is capable of scanning at near real-time (although at relatively low quality).