Desktop/Portable/Tabletop SEM

Desktop/Portable/Tabletop SEM
- Practical Electron Microscopy and Database -
- An Online Book -

Microanalysis | EM Book https://www.globalsino.com/EM/

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

=================================================================================

A desktop (or called portable or tabletop) SEM (scanning electron microscope) is an instrument that can be applied for imaging and microscopic analysis of materials and biological samples. Similar to full-size SEM systems, desktop SEMs scans electron beams on surfaces of samples and then provides three-dimensional (3-D) images. The desktop SEMs can be applied to life science, forensics, pharmaceuticals, nanotechnology, and material science.

The main advantages which the conventional SEMs do not have are:
          i) Desktop SEMs can easily sit on a bench or table in laboratories.
          ii) Desktop SEMs are more cost-effective than large SEMs in many cases.
          iii) Desktop SEMs are easy to use and maintain, fast, and require less training.

Some models of desktop SEMs are EVEX Mini-SEM, Table-top Mini-SEM SNE-3000M (see Figure 3335), Aspex Express/Explorer, Hitachi TM 3000, and Hitachi TM1000 SEM. Table 3335 lists key specifications of desktop and full-size SEM systems.

Table-top Mini-SEM SNE-3000M

Figure 3335. Table-top Mini-SEM SNE-3000M.

Table 3335. Key specifications of desktop and full-size SEM systems.

	Full-size SEMs	Desktop SEMs
Magnification	Up to 1,000,000	Up to 100,000
Detector	SE and BSE detectors	SE and BSE detectors
Accelerating Voltage	200V - 30 kV	1 kV to 15 kV
Resoilltion	2~3 nm at 30 kV, 5~8 nm at 3 kV	≤ 17 nm
Field of view	15 mm at 10 mm working distance
Probe current	1 pA ~ 1 µA
Drift in probe current	W-filament: 0.25%/hour, LaB₆: 2%/hour
Noise in probe current	1% for W- and LaB₆-filaments
Maximum sample size	Up to wafer size	75 mm in diameter, 15 mm in thickness
Analytical methods	EDS	EDS
Power		Single-phase AC 110 - 240 Volt, 50/60 Hz, 300 W
Vacuum	Higher vacuum	Various 'high pressure' modes, no coating is needed
Use	More training is needed	Easy to use and maintain, can learn how to use it in about 30 seconds.
Controls	More controls	Limited controls
Services	Need services	No special services required, Easy to exchange filaments
System	Need special installation	Water, special power, air-plug into standard outlet
Size	Large	Small
Price	Up to $ 1000 k	$ 80 k

=================================================================================

The book author (Yougui Liao) welcomes your comments, suggestions, and corrections, please click here for submission. If you let book author know once you have cited this book, the brief information of your publication will appear on the “Times Cited” page.