Halide-free synthesis of metastable graphitic BC₃

Area of Science:

• Materials Science
• Solid State Chemistry
• Nanomaterials Synthesis

Background:

• Layered BC₃, a metastable boron-carbon phase, has proven difficult to crystallize, typically resulting in poorly ordered materials.
• Existing synthesis methods rely on halide precursors, limiting scalability and compatibility with certain templates due to gaseous byproducts.

Purpose of the Study:

• To develop a novel halide-free synthesis route for producing crystalline, turbostratic BC₃.
• To achieve long-range in-plane ordering in BC₃ materials.
• To establish a computational method for precursor selection in metastable material synthesis.

Main Methods:

• Co-pyrolysis of carefully selected molecular precursors.
• Multi-wavelength Raman spectroscopy for structural characterization.
• Computational screening of precursor compatibility.

Main Results:

• Successful synthesis of turbostratic BC₃ with long-range in-plane ordering.
• Demonstration of a halide-free reaction pathway.
• Identification of precursor pairing as critical for B-C bond formation and preventing phase segregation.

Conclusions:

• A scalable, halide-free method for synthesizing ordered BC₃ has been established.
• The developed computational approach can guide the synthesis of other metastable materials.
• This work overcomes previous limitations in BC₃ crystallization and production.