Year: 2025
Type: article
Abstract: Nanopore evolution theories predict symmetrical expansion or shrinkage by changing free surface energy. Here, a substrate‐restricted regime is uncovered where this criterion fails: in a substrate‐supported ultrathin film, nanopores shrink universally regardless of initial size. Through in situ annealing and cross‐sectional STEM characterization, asymmetric pore dynamics are revealed ‐ top expansion and bottom shrinkage, with a minimum aperture reduced and forming a conical geometry. Such inhomogeneous variation is proposed to be driven by substrate‐restricted molecular migration, following an energy potential gradient along the nanopore channel, distinct from the equilibrium evolution. A generalized kinetics model identifies substrate confinement as an independent variable, establishing a thickness‐dependent critical radius, validated across both single pores and pore arrays. This redefines nanopore evolution in confined systems, with broad avenues for tunable nanoscale interface design.
Source: Advanced Theory and Simulations
Institutions: University College Dublin, Chongqing University of Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,430
Funders: Enterprise Ireland, Research Ireland
Award: G6586249220
OpenAlex ID: W4413853407