Disentangling Memristive and Memcapacitive Effects in Droplet Interface Bilayers Using Dynamic Impedance Spectroscopy

Robert L. Sacci, Haden L. Scott, Zening Liu, Dima Bolmatov, Benjamin Doughty, John Katsaras, C. Patrick Collier

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The underlying principles for generating intelligent behavior in living organisms are fundamentally different from those in traditional solid-state circuits. Biomimetic neuromorphic equivalents based on biological membranes offer novel implementation of tunable plasticity and diverse mechanisms to control functionality. Here, dynamic electrochemical impedance spectroscopy (dEIS) to probe diphytanoylphosphatidylcholine (DPhPC) droplet interface bilayers (DIBs) to better understand the differences in molecular level structure/dynamics that give rise to hysteretic loops and neuromorphic, memelement behaviors in lipid bilayers in response to electrical biasing is used. Importantly, this system does not have ion-conducting channels and is, therefore, not expected to show memristive behavior. Surprisingly, both memristive and memcapacitive behaviors by measuring the time-dependent complex impedance of DPhPC DIBs are detected. It is shown that nonlinear memristance can originate from structural changes in the bilayer, affecting its dielectric properties. This novel dEIS application allows for the simultaneous analysis of the system's changing memristive and memcapacitive properties, which originate from different molecular restructuring processes. Moreover, and importantly, access to this type of information increases the number of neuromorphic processes supported simultaneously in a single two-terminal device.

Original languageEnglish
Article number2200121
JournalAdvanced Electronic Materials
Volume8
Issue number5
DOIs
StatePublished - May 2022

Funding

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Dynamic electrochemical impedance (dEIS) measurements on droplet interface bilayers, were performed at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Data analysis was supported by the U.S. DOE, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. J.K. and H.L.S. are supported through the Scientific User Facilities Division of the Department of Energy (DOE) Office of Science, sponsored by the Basic Energy Science (BES) Program, DOE Office of Science, under Contract No. DEAC05-00OR22725. A portion of this research used resources at the Spallation Netron Source, a U.S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. J.K. would like to thank Fyl Pincus (Department of Physics, University of California, Santa Barbara) and Ralph Lydic (Department of Psychology, University of Tennessee) for many fruitful discussions. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Dynamic electrochemical impedance (dEIS) measurements on droplet interface bilayers, were performed at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. Data analysis was supported by the U.S. DOE, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. J.K. and H.L.S. are supported through the Scientific User Facilities Division of the Department of Energy (DOE) Office of Science, sponsored by the Basic Energy Science (BES) Program, DOE Office of Science, under Contract No. DEAC05‐00OR22725. A portion of this research used resources at the Spallation Netron Source, a U.S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. J.K. would like to thank Fyl Pincus (Department of Physics, University of California, Santa Barbara) and Ralph Lydic (Department of Psychology, University of Tennessee) for many fruitful discussions.

Keywords

  • droplet interface bilayer
  • dynamic impedance spectroscopy
  • lipid bilayer
  • memcapacitor
  • memristor
  • nonlinear elements

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