Scanning Electron Microscope

Scanning Electron Microscope

  • Sharif Solar
  • Electron microscopy

    1. Certificate of Nanotechnology

    2. 2020/01/20
    3. 2023/01/21

    1. NanoScale Certification

    2. 2020/01/20
    3. 2023/01/21
Introduction Application Specification Advantage Of Using Nanotechnology Manual And Maintenance Safety And Package

Scanning electron microscope (SEM) is a powerful tool designed for studying the surface morphology of solid objects and materials characterization. SEMs use electrons for imaging, in a similar way that light microscopes use visible light. Since the wavelength of electrons is much smaller than the wavelength of light, the resolution of SEMs is superior to that of a light microscope. Therefore, surface characterization at higher resolutions requires the use of SEMs.

In a nutshell, the working principles of a SEM instrument are as follows: first, electrons are generated at the top of the column by an electron gun; the emitted electrons are then focused into a very thin beam by magnetic lenses and interact with the specimen. The interaction of electrons with the sample can result in the generation of many different types of electrons and photons. In the case of SEM, the two types of electrons used for imaging are the backscattered (BSE) and the secondary electrons (SE). The electrons reflected from the sample surface are collected by detectors; the output of detectors is converted to an electrical signal and eventually displayed as a contrast image.

  • To examine surface composition and morphology
  • Measuring the thickness of thin films deposited on a substrate

Details of technical specifications are presented in the following Table.

 

 

Electron microscopes are one of the most important analyzing instruments used to study the nano-scale materials. SEMs are generally used to investigate the dimensions, morphology and structure of nanomaterials, such as nanoparticles, nanofibers, nanotubes, etc.

  • Install the device in a place with temperature in the 17 to 28 °C range and humidity of less than 80%.
  • Ambient vibration must be lower than 4 μm/s at frequencies below 30 Hz, and lower than 8 μm/s at frequencies above 30 Hz.
  • Avoid installing the device next to the tools which generate severe electric shocks.
  • For more details on how to use the device, refer to the device catalog and user guide.
  • During using the device, avoid touching the high voltage cables or components which are labelled with High Voltage Warning Sign.
  • To prevent damaging the vacuum pump, close the chamber door before turning the pump on.
  • Different parts of the device are individually packaged and shipped. Customer must check the packages precisely and inform the manufacturer in case of observing any damage or problem.
  • Device installation is done by the company technician and the necessary instructions are given to the operators.
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