Evolution of nanopores in hexagonal boron nitride

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Atomically precise nanopores in 2D materials offer potential in energy, DNA sequencing, and quantum technologies.
• Hexagonal boron nitride (h-BN) is a promising material due to its chemical and thermal stability.
• Existing expectations suggest h-BN nanopores should maintain structural integrity in various environments.

Purpose of the Study:

• To investigate the time evolution of hexagonal boron nitride (h-BN) nanopore geometry.
• To assess the stability of h-BN nanopores under different environmental conditions.
• To understand the mechanisms driving nanopore structural changes.

Main Methods:

• Transmission electron microscopy (TEM) was used to observe h-BN nanopores.
• Experiments were conducted in vacuum and air environments.
• Nanopore geometry was monitored over timescales from one hour to one week at room temperature.

Main Results:

• Significant geometric changes in h-BN nanopores were observed over time.
• Atom motion and adsorption of contaminants at the edges were identified as key factors.
• These changes occurred even at room temperature and in vacuum.
• Nanopore evolution was observed across various timescales.

Conclusions:

• The structural integrity of h-BN nanopores is not as stable as previously assumed.
• Nanopore evolution due to atom motion and contamination has profound implications for their practical applications.
• Further research is needed to mitigate these changes for reliable nanopore device performance.