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Metal doped polyaniline as neuromorphic circuit elements for in-materia computing

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Polyaniline-based atomic switches are material building blocks whose nanoscale structure and resultant neuromorphic character provide a new physical substrate for the development nextgeneration, nanoarchitectonic-enabled computing systems. Metal ion-doped devices consisting of a Ag/metal ion doped polyaniline/Pt sandwich structure were fabricated using an in situ wet process. The devices exhibited repeatable resistive switching between high (ON) and low (OFF) conductance states in both Ag+ and Cu2+ ion-doped devices. The threshold voltage for switching was>0.8 V and average ON/OFF conductance ratios (30 cycles for 3 samples) were 13 and 16 for Ag+ and Cu2+ devices, respectively. The ON state duration was determined by the decay to an OFF state after pulsed voltages of differing amplitude and frequency. The switching behaviour is analagous to short-term (STM) and long-term (LTM) memories of biological synapses. Memristive behaviour and evidence of quantized conductance were also observed and interpreted in terms of metal filament formation bridging the metal doped polymer layer. The successful realization of these properties within physical material systems indicate polyaniline frameworks as suitable neuromorphic substrates for in materia computing.

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Creator
  • Name
    R. Higuchi
    Organization
    National Institute for Materias Science (NIMS)
    Sub organization
    International Center for Materials Nanoarchitectonics (WPI-MANA)
    Role
    author
    Name
    S. Liak
    ORCID
    https://orcid.org/0000-0003-4021-2895
    Organization
    University of California Los Angeles
    Sub organization
    Department of Chemistry and Biochemistry
    Role
    author
    Name
    H. O. Sillin
    Organization
    University of California Los Angeles
    Sub organization
    Department of Chemistry and Biochemistry
    Role
    author
    Name
    T. Tsuruoka
    Organization
    National Institute for Materials Science (NIMS)
    Sub organization
    International Center for Materials Nanoarchitectonics (WPI-MANA)
    Role
    author
    Name
    M. Kunitake
    Organization
    Kumamoto University
    Sub organization
    Graduate School of Science and Technology
    Role
    author
    Name
    T. Nakayama
    ORCID
    https://orcid.org/0000-0001-9696-475X
    Organization
    National Institute for Materials Science (NIMS)
    Sub organization
    International Center for Materials Nanoarchitectonics (WPI-MANA)
    Role
    author
    Name
    J. K. Gimzewski
    Organization
    University of California Los Angeles
    Sub organization
    California Nano System Institute (CNSI)
    Role
    author
    Name
    A. Z. Stieg
    Organization
    University of California Los Angeles
    Sub organization
    California Nano System Institute (CNSI)
    Role
    author
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Date published
  • 13/02/2023
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  • Version of record (Published version)
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