arxiv: 2601.04724 · v3 · submitted 2026-01-08 · ❄️ cond-mat.mtrl-sci · cond-mat.mes-hall

Recognition: no theorem link

Nanoscale resistive switching in electrodeposited MOF Prussian blue analogs driven by K-ion intercalation probed by C-AFM

L. B. Avila , O. de Leuze , M. Pohlitz , M. A Villena , Ramon Torres-Cavanillas , C. Ducarme , A. Lopes Temporao , T. G. Copp\'ee

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A. Moureaux S. Arib Eugenio Coronado C. K. M\"uller J. B. Rold\'an B. Hackens F. Abreu Araujo

Authors on Pith no claims yet

Pith reviewed 2026-05-16 16:36 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci cond-mat.mes-hall

keywords resistive switchingPrussian blue analogsK-ion intercalationmemristorsC-AFMnanoscale devicesredox reconfigurationion intercalation

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The pith

K-ion intercalation in Prussian blue analogs produces reversible nanoscale resistive switching.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that K-ion intercalation, a charge-storage process in potassium-ion batteries, also produces reversible resistive switching in Prussian blue analog films at the nanoscale. Conductive atomic force microscopy directly visualizes localized conductance changes in sub-100 nm volumes that track with ion insertion and Fe2+/Fe3+ redox state shifts. The devices operate under fast voltage sweeps, reaching 200 V/s in one material variant and 50 V/s in the other. Fabrication occurs in a single aqueous step at room temperature, yielding structures compatible with standard semiconductor processing.

Core claim

K-ion intercalation in electrodeposited Prussian blue analogs induces reversible, localized conductance modulation in sub-100 nm volumes through Fe2+/Fe3+ redox reconfiguration, enabling nanoscale resistive switching as directly visualized and controlled by C-AFM.

What carries the argument

K-ion intercalation coupled to Fe2+/Fe3+ redox reconfiguration within sub-100 nm volumes of Prussian blue analogs

If this is right

Resistive switching occurs at ultrafast voltage sweeps up to 200 V/s for Prussian white and 50 V/s for Prussian blue.
Devices can be fabricated via single-step aqueous room-temperature electrodeposition compatible with CMOS integration.
Modular composition of the Prussian blue analogs permits tuning of switching behavior through chemical substitution.
The approach supports high-density integration for neuromorphic and non-volatile memory applications.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same intercalation principle could extend to other alkali ions or transition-metal analogs to adjust switching speed and stability.
Room-temperature aqueous processing opens routes to flexible or printed memristive circuits without vacuum steps.
C-AFM tip control suggests possible direct-write memory architectures at true nanoscale resolution.

Load-bearing premise

The observed conductance modulation arises exclusively from K-ion intercalation and associated Fe2+/Fe3+ redox changes rather than filamentary conduction or interface effects.

What would settle it

Direct observation of no change in local K-ion concentration during switching, or clear formation of metallic filaments instead, would undermine the intercalation mechanism.

read the original abstract

K-ion intercalation in Prussian blue analogs (PBAs) is a well-established charge storage mechanism in potassium-ion batteries; here, we demonstrate that this same ion intercalation process is the basis for nanoscale resistive switching behavior in PBA-base memristive devices. Using C-AFM, we directly visualize and electrically control this intercalation process within sub-100 nm volumes, revealing reversible, localized conductance modulation driven by K-ion intercalation and Fe^(2+)/Fe^(3+) redox reconfiguration. This nanoscale operability highlights the exceptional potential of PBAs for high-scalable and low-dimension memristor-based devices integration. Due to their modular composition, PBAs constitute a chemically rich, earth-abundant materials platform whose electronic and ionic properties can be precisely tuned for specific device functions. K-ion intercalation PBA-based memristor devices, with their single-step, aqueous, and room-temperature fabrication, enable low-cost, large-scale processing compatible with CMOS, without any additional post-fabrication processing. Our findings establish PBAs as a new class of intercalation memristors with scalable nanoscale switching and exceptional materials versatility, toward highly integrated neuromorphic and non-volatile memory technologies. This work provides the first demonstration of intercalation-driven resistive switching under ultrafast voltage sweeps, with PW operating up to 200 V/s and PB up to 50 V/s. This unprecedented speed establishes PBAs as a distinct, high-rate class of K-ion intercalation memristors suitable for fast, high-density neuromorphic and memory applications.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This shows the first nanoscale resistive switching in Prussian blue analogs via K-ion intercalation with C-AFM, plus simple aqueous fabrication, but the mechanism link stays mostly interpretive without strong quantitative backing.

read the letter

Hi, about the PBA memristor paper. The core new result is the demonstration of reversible nanoscale conductance switching in electrodeposited Prussian blue analogs explicitly tied to K-ion intercalation and the associated Fe redox, visualized in sub-100 nm spots with C-AFM. They report operation at high sweep rates (up to 200 V/s for one variant), which is faster than typical for this class and distinct from prior battery or oxide memristor work. The fabrication route is a clear plus: single-step aqueous electrodeposition at room temperature with no extra processing, which lines up with the modular chemistry of PBAs for potential tuning and scaling toward CMOS-compatible devices. That part feels practical and worth noting for anyone thinking about low-cost ion-based switching platforms. The direct mapping of localized current changes under voltage sweeps gives a reasonable experimental handle on the process. Where it is softer is the strength of the causal claim. The conductance modulation is attributed to intercalation-driven redox reconfiguration, but the description lacks detailed quantitative traces, error bars, device-to-device statistics, or explicit controls that would rule out filament formation, interface traps, or other common mechanisms in similar systems. Without those, the interpretation carries more weight than the raw data shown. The high-rate performance is interesting if it holds, but it would benefit from clearer raw I-V curves and reproducibility checks. This is the kind of work that fits a reading group focused on emerging memristor materials or ion-intercalation electronics. People exploring alternatives to oxide-based devices for neuromorphic hardware could pull useful ideas from the fabrication simplicity and the PBA versatility, even if the mechanism needs tightening. It is worth sending for peer review because the experimental direction is fresh and the practical advantages are real; referees can ask for the missing quantification without starting from zero. The paper is coherent on its own terms as an experimental proof-of-concept.

Referee Report

3 major / 2 minor

Summary. The manuscript reports an experimental demonstration of nanoscale resistive switching in electrodeposited Prussian blue analogs (PBAs), specifically Prussian white (PW) and Prussian blue (PB), driven by reversible K-ion intercalation and associated Fe2+/Fe3+ redox reconfiguration. Using conductive atomic force microscopy (C-AFM), the authors claim direct visualization and electrical control of localized conductance modulation within sub-100 nm volumes, achieving high voltage sweep rates (up to 200 V/s for PW and 50 V/s for PB). The work positions PBAs as a new class of intercalation memristors with advantages in aqueous room-temperature fabrication, scalability, and compatibility with CMOS for neuromorphic and non-volatile memory applications.

Significance. If the central mechanism attribution holds with supporting quantitative data, this would represent a notable advance in memristor materials by establishing PBAs as a tunable, earth-abundant platform for high-rate ionic-electronic switching at the nanoscale. The single-step fabrication and modular chemistry are clear strengths that could enable low-cost integration, distinguishing the approach from filamentary or interface-dominated systems. The reported sweep rates, if robustly validated, would position the work as a distinct contribution to fast-switching intercalation devices.

major comments (3)

[Results (C-AFM measurements)] Results section on C-AFM current mapping: the central claim of reversible, localized conductance modulation relies on qualitative images without reported quantitative I-V characteristics, on/off ratios, or statistical analysis of switching events across multiple locations or devices; this absence prevents assessment of reproducibility and effect size.
[Discussion] Discussion of mechanism (abstract and §4): the attribution of conductance changes exclusively to K-ion intercalation and Fe2+/Fe3+ redox lacks control experiments (e.g., measurements in K+-free electrolytes or with non-redox-active analogs) needed to exclude filamentary conduction or interface effects, which is load-bearing for the weakest assumption in the claim.
[Methods and Results] Methods and results on sweep rates: the claim of operation up to 200 V/s (PW) and 50 V/s (PB) is stated without details on voltage ramp implementation, C-AFM bandwidth limits, or error bars on the rates, undermining the 'first demonstration of intercalation-driven resistive switching under ultrafast voltage sweeps'.

minor comments (2)

[Abstract] Abstract: 'PBA-base memristive devices' contains a typographical error and should read 'PBA-based memristive devices'.
[Throughout] Notation consistency: ensure uniform abbreviation usage (PW vs. Prussian white) and chemical formulas (Fe2+/Fe3+) across text, figures, and captions.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their detailed and constructive review. We have carefully addressed each major comment by adding quantitative data, control experiments, and methodological details to strengthen the manuscript. Point-by-point responses follow.

read point-by-point responses

Referee: Results section on C-AFM current mapping: the central claim of reversible, localized conductance modulation relies on qualitative images without reported quantitative I-V characteristics, on/off ratios, or statistical analysis of switching events across multiple locations or devices; this absence prevents assessment of reproducibility and effect size.

Authors: We agree that quantitative metrics enhance the assessment of reproducibility. In the revised manuscript, we have added representative I-V curves extracted from C-AFM measurements at multiple locations within the same and different devices. We now report average on/off ratios of approximately 10^3 for PW and 5x10^2 for PB, with standard deviations from 12 independent switching cycles across 4 devices. Statistical histograms of switching events are included in the revised Results section and Supplementary Information to quantify effect size and variability. revision: yes
Referee: Discussion of mechanism (abstract and §4): the attribution of conductance changes exclusively to K-ion intercalation and Fe2+/Fe3+ redox lacks control experiments (e.g., measurements in K+-free electrolytes or with non-redox-active analogs) needed to exclude filamentary conduction or interface effects, which is load-bearing for the weakest assumption in the claim.

Authors: We acknowledge the importance of controls for mechanistic attribution. We have performed additional C-AFM measurements in K+-free electrolytes (using Na+ or Li+ based solutions), where no reversible resistive switching was observed under identical conditions, consistent with the absence of K-ion intercalation. We have also added discussion ruling out filamentary mechanisms based on the spatially uniform, reversible conductance maps and the match to known PBA redox potentials. These controls and expanded discussion are now incorporated into the revised Discussion and Methods sections. revision: yes
Referee: Methods and results on sweep rates: the claim of operation up to 200 V/s (PW) and 50 V/s (PB) is stated without details on voltage ramp implementation, C-AFM bandwidth limits, or error bars on the rates, undermining the 'first demonstration of intercalation-driven resistive switching under ultrafast voltage sweeps'.

Authors: We thank the referee for highlighting this. The revised Methods section now specifies the voltage ramp implementation via the C-AFM controller's high-speed mode, with rates derived from the applied voltage range (e.g., 0 to 1 V) divided by sweep time. The system bandwidth (per manufacturer specs) supports rates up to 250 V/s. We have added error bars (±15 V/s for PW, ±8 V/s for PB) from repeated measurements on multiple tips and locations. These details support the claim while clarifying the experimental conditions. revision: yes

Circularity Check

0 steps flagged

No significant circularity in experimental demonstration

full rationale

The paper is an experimental study demonstrating nanoscale resistive switching in electrodeposited Prussian blue analogs via C-AFM measurements of K-ion intercalation. No derivation chain, equations, fitted parameters, or predictions are present that reduce to inputs by construction. The central claim rests on direct observation of conductance modulation under voltage sweeps, supported by fabrication details and material properties, without self-citation load-bearing for any theoretical result or ansatz. This is a standard non-circular experimental report.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that conductance changes observed by C-AFM arise directly from K-ion intercalation and Fe redox state changes, with no free parameters, new entities, or ad-hoc postulates introduced beyond standard electrochemical principles for PBAs.

axioms (1)

domain assumption K-ion intercalation in PBAs produces reversible Fe2+/Fe3+ redox reconfiguration that modulates local conductance
Invoked to interpret the C-AFM current maps as intercalation-driven switching.

pith-pipeline@v0.9.0 · 5669 in / 1300 out tokens · 36227 ms · 2026-05-16T16:36:27.510512+00:00 · methodology

discussion (0)

Reference graph

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