Single-Crystal Diamond Needle Fabrication Using Hot-Filament Chemical Vapor Deposition

Single-crystal diamonds in the form of micrometer-scale pyramids were produced using a combination of hot-filament (HF) chemical vapor deposition (CVD) and thermal oxidation processes. The diamond pyramids were compared here with similar ones that were manufactured using plasma-enhanced (PE) CVD. The similarities revealed in the morphology, Raman, and photoluminescent characteristics of the needles obtained using the hot-filament and plasma-enhanced CVD are discussed in connection with the diamond film growth mechanism. This work demonstrated that the HF CVD method has convincing potential for the fabrication of single-crystal diamond needles in the form of regularly shaped pyramids on a large surface area, even on non-conducting substrates. The experimental results demonstrated the ability for the mass production of the single-crystal needle-like diamonds, which is important for their practical application.

Automated summary

This study compared single-crystal diamond pyramids produced using hot-filament chemical vapor deposition (CVD) and thermal oxidation processes with those produced using plasma-enhanced (PE) CVD. The similarities in morphology, Raman, and photoluminescent characteristics were discussed in connection with the diamond film growth mechanism. The experimental results demonstrated the potential for mass production of single-crystal needle-like diamonds using the HF CVD method, highlighting their practical application.