Structural and Optical Properties of Silicon Carbide Powders Synthesized from Organosilane Using High-Temperature...

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Physics

Background:

• High-quality silicon carbide (SiC) nanocrystals are crucial for advanced applications.
• Existing synthesis methods often struggle with size control and structural perfection.

Purpose of the Study:

• To develop a novel, size-controllable synthesis method for high-quality SiC 3C polytype nanocrystals.
• To investigate the influence of synthesis parameters on crystal size and optical properties.

Main Methods:

• Pyrolysis of organosilane (C12H36Si6) under high pressure (8 GPa).
• Controlled variation of synthesis temperatures from 800 °C to 2000 °C.
• Characterization using IR transmission spectroscopy, Raman scattering, and low-temperature photoluminescence.

Main Results:

• Achieved size-controllable synthesis of SiC 3C polytype nanocrystals (2 nm to 500 nm) by adjusting temperature (800-1400 °C).
• Demonstrated suppression of crystal growth at higher temperatures due to recrystallization.
• Correlated optical properties with carrier concentration, defect types, and LO phonon-plasmon modes.

Conclusions:

• The novel pyrolysis method enables precise control over SiC nanocrystal size and quality.
• Synthesis conditions and heat treatments allow tuning of optical properties for IR photonics.
• This work provides a pathway for mass production of tailored SiC nanocrystals.