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Related Concept Videos

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...
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In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography (CT) and Light Microscopy (LM) Correlated with Scanning Electron Microscopy (SEM)
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Study on a High-Current CNT Cathode X-Ray Tube.

Huaping Tang1,2, Jinmei Chen2, Guoyu Li2

  • 1Department of Engineering Physics, Tsinghua University, Beijing 100084, China.

Nanomaterials (Basel, Switzerland)
|May 12, 2026
PubMed
Summary
This summary is machine-generated.

Carbon nanotube (CNT) cathodes achieve high current density (7.8 A/cm²) and high emission current (350 mA) for powerful X-ray generation. These durable CNT cathodes demonstrate stable performance and long operational lifetimes.

Keywords:
X-ray tubecarbon nanotubescurrent intensityemission current densityfield emission

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • High-power X-ray generation requires advanced cathode materials for high current emission.
  • Carbon nanotube (CNT) cathodes offer potential due to their unique electronic properties.

Purpose of the Study:

  • To develop CNT cathodes with high current emission density and high emission current for high-power X-ray applications.
  • To evaluate the performance and durability of fabricated CNT cathodes.

Main Methods:

  • Fabrication of CNT cathodes using high-purity, small-diameter CNT materials.
  • A novel "five-state" electrophoretic deposition method was employed.
  • Performance testing included emission current, current density, X-ray dose rate, focal spot size, and long-term durability.

Main Results:

  • Achieved a stable cathode emission current of 350 mA with a current density of 7.8 A/cm² over a 10 mm × 0.45 mm area.
  • Measured an X-ray dose rate of 39.49 mGy/s@50 cm at 120 kV and 100 mA.
  • Demonstrated a focal spot size of approximately 1 mm and an estimated cathode lifetime of ~5085 hours.

Conclusions:

  • This study presents CNT cathodes simultaneously achieving multi-A/cm² emission density, hundreds-of-milliampere emission current, and hundreds-of-millisecond pulse width.
  • The developed CNT cathodes exhibit stable, reliable durability, making them suitable for high-power X-ray generation.