Scaled-down ionic liquid-functionalized geopolymer memristors

Maedeh Ahmadipour; Mahmudul Alam Shakib; Zhaolin Gao; Stephen A Sarles; Caterina Lamuta; Reza Montazami

doi:10.1039/d5mh00231a

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Scaled-down ionic liquid-functionalized geopolymer memristors

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Scaled-down ionic liquid-functionalized geopolymer memristors

Maedeh Ahmadipour, Mahmudul Alam Shakib, Zhaolin Gao, Stephen A Sarles, Caterina Lamuta and Reza Montazami

Materials horizons, Vol.12(12), pp.4208-4228

05/13/2025

DOI: 10.1039/d5mh00231a

PMID: 40358460

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Abstract

Whereas most memristors are fabricated using sophisticated and expensive manufacturing methods, we recently introduced low-cost memristors constructed from sustainable, porous geopolymers (GP) at room temperature simple casting processes. These devices exhibit resistive switching electroosmosis and voltage-driven ion mobility inside water-filled channels within the porous material, enabling promising synaptic properties. However, GP memristors were previously fabricated at the centimeter scale, too large for space-efficient neuromorphic computing applications, and displayed limited memory retention durations due to water evaporation from the pores of the GP material. In this work, we overcome these limitations by implementing (i) an inexpensive manufacturing method that allows fabrication at micron-scale (99.998% smaller in volume than their centimeter-scale counterparts) and (ii) functionalization of GPs with EMIM Otf ionic liquid (IL), which prolonged retention of the memristive switching properties by 50%. This improved class of GP-based memristors also demonstrated ideal synaptic properties in terms of paired-pulse facilitation (PPF), paired-pulse depression (PPD), and spike time dependent plasticity (STDP). These improvements pave the way for using IL-functionalized GP memristors in neuromorphic computing applications, including reservoir computing, in-memory computing, memristors crossbar arrays, and more.

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Details

Title: Subtitle: Scaled-down ionic liquid-functionalized geopolymer memristors
Creators: Maedeh Ahmadipour - Iowa State University
Mahmudul Alam Shakib - Department of Mechanical Engineering, College of Engineering, University of Iowa, Iowa City, Iowa 52242, USA. caterina-lamuta@uiowa.edu
Zhaolin Gao - University of Iowa
Stephen A Sarles - University of Tennessee at Knoxville
Caterina Lamuta - University of Iowa
Reza Montazami - Iowa State University
Resource Type: Journal article
Publication Details: Materials horizons, Vol.12(12), pp.4208-4228
DOI: 10.1039/d5mh00231a
PMID: 40358460
NLM abbreviation: Mater Horiz
ISSN: 2051-6347
eISSN: 2051-6355
Publisher: Royal Society of Chemistry
Grant note: Air Force Office of Scientific Research: FA9550-21-1-0416 Air Force Office of Scientific Research: W911NF-23-2-0020 U.S. Army Research OfficeMaterials Analysis and Research Lab at Iowa State University
CL acknowledges financial support from the Air Force Office of Scientific Research (grant no FA9550-21-1-0416). RM acknowledges financial support from the U.S. Army Research Office (grant no W911NF-23-2-0020). MA thanks Dr Warren Straszheim, manager of the Materials Analysis and Research Lab at Iowa State University, for his expert guidance in the operation of the scanning electron microscope and energy-dispersive X-ray spectrometry.
Language: English
Date published: 05/13/2025
Academic Unit: Roy J. Carver Department of Biomedical Engineering; Mechanical Engineering
Record Identifier: 9984822962102771

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