Conductance-based profiling of nanopores: Accommodating fabrication irregularities

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Solid-state nanopores are crucial for single-molecule detection, requiring precise control over nanoscale dimensions (<10 nm).
• Fabrication processes for nanopores are challenging, necessitating robust characterization methods.

Purpose of the Study:

• To reassess and validate a simulation framework for characterizing nanopore formation.
• To investigate the capability of time-dependent conductance measurements to detect fabrication defects and multiple pores.

Main Methods:

• Utilized simulation of time-dependent conductance changes during nanopore formation.
• Validated simulation model against experimental data from Yanagi et al.
• Introduced relaxed model constraints to account for defects and multiple pores.

Main Results:

• The time-dependent conductance formalism effectively detects and characterizes nanopore defects.
• The method can determine the number of pores formed, distinguishing single from multiple pores.
• Discrimination between correct and incorrect nanopore profiles was possible, with dimensional differences providing uncertainty bounds.

Conclusions:

• Time-dependent nanopore conductance provides valuable insights into nanopore structure and function.
• This approach is effective even when nanopore fabrication involves defects.
• The simulation framework offers a versatile tool for nanopore characterization during fabrication.