Three-dimensional structures of magnesium nanopores

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Physics

Background:

• Nanopore-based devices are crucial for various applications, and their performance is linked to nanopore geometry.
• Controlling the three-dimensional (3D) structure of nanopores is essential for optimizing device functionality.

Purpose of the Study:

• To investigate the fabrication of faceted nanopores in magnesium (Mg) using electron beam (e-beam) sculpting.
• To characterize the resulting 3D nanopore structures and understand their formation mechanisms.
• To provide design guidance for controllable fabrication of solid-state nanopores.

Main Methods:

• Fabrication of nanopores in Mg using aligned electron beam (e-beam) sculpting along the [0001] direction.
• Detailed structural characterization using transmission electron microscopy (TEM).
• Analysis of nanopore morphology in relation to the diameter-to-thickness ratio (D/t).

Main Results:

• Two distinct 3D nanopore structures were observed: hexagonal prism-shaped and hourglass-shaped.
• The 3D morphology of the nanopores was found to be dependent on the widest nanopore diameter-to-thickness ratio (D/t).
• A plausible formation mechanism for the observed 3D structures was proposed.

Conclusions:

• The study successfully fabricated and characterized two unique 3D nanopore structures in magnesium.
• The diameter-to-thickness ratio is a critical parameter influencing nanopore 3D morphology.
• These findings offer valuable insights for the size- and shape-controllable fabrication of solid-state nanopores via e-beam sculpting.