University of Osaka Researchers Develop Autonomous Memory Nanopore

Most conventional laboratory sensors operate on a singular principle: they passively detect whatever happens to pass through their channels. A team of researchers at the University of Osaka has upended that paradigm by building a tiny device that behaves more like a biological system. According to reporting published on August 2, 2026, in ACS Nano, scientists created an autonomous solid-state nanopore that not only detects molecules as they pass through, but also retains memories of recent events and selectively responds to them without any external electronic control.

An Autonomous Nanopore That Reshapes Itself Under Constant Voltage

Nanopores are minuscule holes measuring only a few billionths of a meter wide, traditionally used in laboratory settings to detect biological molecules like DNA and proteins by tracking changes in electrical current. Standard nanopores function as fixed, passive openings controlled by external electronics. However, the new device developed at the University of Osaka’s SANKEN and collaborating institutions operates entirely differently, according to lead author Makusu Tsutsui.

MIT Researchers Develop Blood Vessel-on-a-Chip to Guide Capillary Growth

Our nanopore works differently, Tsutsui said, explaining that under a constant voltage supply, chemical reactions inside the pore repeatedly build up and dissolve tiny mineral deposits. This continuous cycle forces the nanopore to open and close independently, generating bursts of electrical signals without external switching.

Unlocking Molecular Memory and Distinct Electrical Signatures

Because the nanopore continuously alters its own structure, it creates a dynamic sensing environment. As amino acids and nucleotides travel through the pore, they interact with the ongoing chemical reactions and influence how the nanopore evolves over time.

Senior author Tomoji Kawai noted that different molecules alter the size, duration, and timing of electrical spikes in distinct ways. As each signal also depends on the nanopore’s recent memory, the device behaves as a remembering, chemically active sensor, Kawai explained.

To evaluate the device, the research team applied machine learning to analyze these state-dependent signatures. The autonomous nanopore successfully distinguished all four DNA nucleotides, accurately measured complex mixtures containing multiple nucleotides, and successfully identified seven different amino acids without requiring active electronic control during the sensing process.

Implications for Biomedical Diagnostics and Iontronic Technologies

This self-regulating approach marks a fundamental departure from traditional nanoscale sensor design. This represents a shift in how nanopores are designed, Tsutsui said, noting that nanopores can now actively respond to their chemical environment rather than serving merely as passive channels.

Osaka Researchers Generate Red Blood Cell-Like Cells From Canine iPSCs

According to the University of Osaka research details, multifunctional nanopores of this caliber could substantially improve molecular analysis for biomedical diagnostics and research. Furthermore, they could contribute to emerging iontronic technologies designed to process information using ions rather than conventional electrons, successfully integrating sensing capabilities, memory, and signal generation into a single intelligent nanoscale device.