Why was the scanning tunneling microscope important to the development of nanotechnology?

The scanning tunneling microscope (STM) was pivotal to the development of nanotechnology because it provided the first simple method for imaging the atomic structure of surfaces. Developed in 1981 by Gerd Binnig and Heinrich Rohrer, the instrument allowed scientists to observe individual atoms and their spatial distribution, effectively opening a new era for surface science.12

Beyond imaging, the STM proved essential because it enabled the manipulation of matter at the atomic scale. By utilizing the strong electric field between the probe tip and the sample, researchers could move individual atoms to specific locations. This capability was famously demonstrated in 1990 when Donald Eigler used an STM to arrange 35 xenon atoms to spell the IBM logo. This precision demonstrated the potential for fabricating nanostructures and patterning surfaces with unprecedented control, spawning a wide variety of subsequent scanning probe tools for nanoscale observation and manipulation.12