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Research Highlight

Dynamic Impedance Reveals Multiple Memory Elements in Membrane-Based Memcapacitors

Scientific Achievement

Dynamic impedance spectroscopy revealed that structural reorganization drives the memory behavior of membranes formed from lipid bilayers by deconvoluting memristance from memcapacitance.

Significance and Impact

Understanding how a membranes’ dielectric properties can be tuned by electric stimulation or other chemical changes opens the door to new memory behaviors and multiplexed functionality from two-terminal devices.

Research Details

Dynamic impedance spectroscopy was used to probe nonlinear charging behavior in lipid bilayers as a function of biasing amplitude and frequency.
Time-constant analysis distinguished memory behavior resulting from simple geometric changes (e.g., bilayer thickening) from structural reorganization (e.g., alkyl chain restructuring) that results in a change of the dielectric properties of the system.
 
R.L. Sacci, H.L. Scott, Z. Liu, D. Bolmatov, B. Doughty, J. Katsaras, and C.P. Collier, Advanced Electronic Materials 8 2200121 (2022). DOI: 10.1002/aelm.202200121