A polycrystalline diamond micro-detector for X-ray absorption fine-structure measurements

Area of Science:

• Materials Science
• Physics
• Analytical Chemistry

Background:

• Microminiaturization of X-ray detectors is crucial for advanced experimental techniques.
• Chemical-vapor-deposited (CVD) polycrystalline diamond offers advantageous properties like thermal stability and conductivity for detector fabrication.

Purpose of the Study:

• To fabricate and characterize a micro-detector using CVD polycrystalline diamond film.
• To evaluate the performance of the CVD diamond micro-detector in X-ray absorption fine-structure (XAFS) spectroscopy.

Main Methods:

• Fabrication of a micro-detector using CVD polycrystalline diamond.
• Performance testing using K-edge XAFS spectra of Cr, Fe, Cu, and Se foils.
• Comparison with a routine ion chamber at the Beijing Synchrotron Radiation Facility.

Main Results:

• The CVD diamond micro-detector was successfully fabricated with dimensions of 15mm × 7.8mm × 5.8mm.
• The detector exhibited excellent performance in recording XAFS spectra, outperforming a standard ion chamber.
• Feasibility demonstrated for X-ray intensity recording in XAFS measurements.

Conclusions:

• CVD polycrystalline diamond is a suitable material for fabricating high-performance micro-detectors.
• The developed CVD diamond micro-detector is a viable alternative for XAFS measurements.
• This technology advances combined X-ray experimental techniques through enhanced detector capabilities.