Answer:
STM = Scanning Tunneling Microscope
Explanation:
STM and its significance
<em>It is the microscope that can take </em><u><em>images of the particles at the atomic scale</em></u><em>.It opens the door to under the </em><u><em>nano-scale process .</em></u>
<u><em>In 1986 Heinrich Rohrer won the nobel prize for its discovery</em></u>
<u><em>It doesn't magnify images like other microscopes .</em></u>
<u><em>It uses the principle of quantum tunneling. </em></u>
Working :
<em>A fine needle like tip is scanned on the surface of electrically conducting sample. When voltage is applied , the electron jumps between the suface of the tip and sample . This flow of electron is detected by the detector. It can resolve the image upto 0.000000001 m or 1 nm (nanometer)</em>
Uses :
- The STM is used in molecular science called nanotechnology to study nano phenomenon
- Its prototype AFM are used to Study wide range of Nano-particles
- STM is used in atomic deposition of metals with required scientific pattern, which can be used as nanodevices themselves.
- It is used to study electron-friedel oscillation on the surface of metals.
- It is used to modify sample surface.