Controlled radiation damage and edge structures in boron nitride membranes

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Graphene's radiation sensitivity limits its use in electron beam-intensive applications.
• Understanding the radiation tolerance of 2D materials is critical for their technological advancement.

Purpose of the Study:

• To compare the electron beam irradiation resistance of hexagonal boron nitride (hBN) and graphene.
• To investigate the radiation damage mechanisms in hBN membranes.
• To characterize the edge structures and termination species of hBN.

Main Methods:

• Synthesis of hBN membranes via chemical exfoliation.
• Electron beam irradiation at 80 kV.
• Quantum chemical calculations for radiation damage modeling.
• High-resolution microscopy for structural analysis.

Main Results:

• hBN membranes exhibit higher resistance to electron beam irradiation than graphene.
• Monolayer hBN remains stable, forming no vacancy defects or amorphization.
• Predominant zigzag edge structures were observed in freestanding and supported hBN.
• Elemental analysis confirmed nitrogen as the predominant zigzag edge termination species.

Conclusions:

• Hexagonal boron nitride is a highly radiation-tolerant 2D material, outperforming graphene.
• The intrinsic stability of hBN makes it suitable for applications requiring high electron beam exposure.
• The identified N-terminated zigzag edges offer insights into hBN's surface chemistry and reactivity.