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REVIEW 4 major objections 4 minor 56 references

Morphology Engineering of Mixed Ionic Electronic Conductors through Aqueous Phase Separation

T0 review · 4 major / 4 minor · reviewed 2026-08-10 · deepseek-v4-flash

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Pith's one-line read Interconnected pores from pH-induced aqueous phase separation let 120–200 µm-thick PEDOT:PSS:PEI OECT channels reach 30 mS transconductance and 13 ms response at 0.05 V gate voltage.

desk verdict A promising water-based route to porous OECT channels, but the morphology-dominance claim is not yet proven because composition and pore architecture are confounded. read the letter →

arxiv 2608.07130 v1 pith:MLXMSKDB submitted 2026-08-07 cond-mat.mtrl-sci

Siqi Wang , Maria Restrepo , John Linkhorst , Matthias Wessling This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords PEDOT:PSSorganicelectrochemicaltransistors(OECTs)aqueousphaseseparationmixedionic-electronicconductorstransconductanceporousmorphologypolyelectrolytecomplexationiontransport
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper sets out to show that the internal pore structure of a conducting-polymer film can break the usual trade-off in organic electrochemical transistors (OECTs), where thicker channels amplify signals more but respond more slowly. By using pH-induced aqueous phase separation to make porous PEDOT:PSS:PEI films, the authors produce channels over 100 µm thick that still let electrolyte ions reach deep into the material. They report a transconductance of 30 mS and a response time of 13 ms at a very low gate voltage of 0.05 V, values normally associated with much thinner channels. The key comparison is between two film compositions with similar electronic conductivity but different pore architectures: the one that keeps an interconnected pore network after annealing and rehydration gives higher transconductance and a faster response. If the interpretation holds, morphology becomes a practical design knob for mixed ionic-electronic conductors, complementing molecular structure and device geometry.

What carries the argument

The central object is the interconnected macroporous network formed in PEDOT:PSS:PEI films by aqueous phase separation (APS): casting a homogeneous solution and immersing it in an acidic coagulation bath protonates PEI amines, triggering complexation with PSS sulfonate groups and phase separation into polymer-rich and pore phases. The pore network is what carries the argument: it provides continuous electrolyte-accessible pathways that shorten the effective ion-diffusion length, and it increases the internal surface area available for electrochemical doping. Two auxiliary mechanisms complete the picture: DMSO acts as a secondary dopant that improves PEDOT ordering and electronic connectivity, and annealing at 140 °C triples the film conductivity while consolidating the polyelectrolyte matrix. The 1:2 PSS:PEI ratio matters because it gives near-stoichiometric charge compensation, so the porous architecture survives annealing and rehydration instead of collapsing as the 1:1 film does.

What would settle it

Measure the electronic conductivity of both films in the hydrated state (for example, four-probe or impedance measurements in 0.1 M NaCl) and determine the electrochemically active volume from thickness-dependent capacitance. If the wet conductivity of the 1:1 film is markedly lower than the 1:2 film, or if the transconductance normalized by electrochemically active volume is the same for both morphologies, the claim that pore connectivity dominates the performance difference would be falsified.

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Extended reading notes

Core claim

On its own terms, the paper's central claim is that an interconnected pore network generated by pH-triggered aqueous phase separation lets a thick OECT channel combine high amplification with fast switching, because electrolyte can penetrate the channel volume instead of modulating only the outer surface. The evidence is a side-by-side comparison of PSS:PEI 1:1 and 1:2 films coagulated in 1 M H2SO4: the two have comparable dry electronic conductivity, but the 1:2 film keeps a well-connected porous architecture after annealing and rehydration, whereas the 1:1 film largely collapses and swells. The 1:2 device reaches a maximum transconductance of 30 ± 6.4 mS at $V_G = 0.05$ V and a response time of 13 ms, against 18 ± 5.3 mS and 39 ms for the 1:1 device, despite both channels being 120–200 µm thick. The authors attribute the difference to shorter local ion-transport distances and a larger electrochemically addressable volume supplied by the pores, with DMSO treatment and annealing preserving electronic percolation in the PEDOT-rich phase. They are careful to state that the resulting operation is consistent with a shift from surface-limited toward spatially distributed mixed ionic-electronic transport, and that quantitative confirmation would require impedance, capacitance, and ionic-conductivity measurements.

Load-bearing premise

The load-bearing premise is that the two film compositions have essentially the same electronic conductivity when wet and operating inside the transistor, even though only dry two-probe conductivities were measured; the 1:1 film is described as swelling more strongly in water, which could lower its hydrated conductivity and explain part of the performance gap without invoking pore connectivity.

Editorial extensions

If this is right

  • Thick OECT channels no longer necessarily sacrifice speed: the interconnected pore network allows high transconductance and short response time to be achieved together.
  • Internal morphology becomes a design parameter that complements molecular structure and device geometry, so optimizing pore connectivity and electronic-phase continuity should be part of OECT design.
  • The water-based APS route produces freestanding, processable porous films without freeze-drying, aerogel processing, or templating, offering a scalable fabrication path for thick-channel devices.
  • The best formulation in the paper, PSS:PEI 1:2 coagulated in 1 M H2SO4 with DMSO and annealing, reaches 15.65 mS/cm conductivity, 30 mS transconductance, and 13 ms response in a 120–200 µm channel.
  • Direct confirmation of fully volumetric modulation still requires quantitative measurements of volumetric capacitance, ionic conductivity, and diffusion impedance, as the paper itself states.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A direct test the paper does not run: if pore connectivity is the active ingredient, then filling or collapsing the pores after film formation (for example, by infiltrating an insulating gel) should erase the transconductance and speed advantage while leaving the dry conductivity roughly unchanged.
  • Because the 1:1 film swells more, its hydrated electronic conductivity is plausibly lower than the 1:2 film; a wet four-probe measurement could attribute part of the 66.7% transconductance gap to electronic conductivity rather than pore architecture, which would soften the morphology-dominance claim.
  • The same aqueous phase separation route should transfer to other weak polyelectrolyte/conducting-polymer pairs, so that pore size, tortuosity, and phase continuity could be screened as independent variables for any mixed ionic-electronic conductor, not only PEDOT:PSS.
  • If the volumetric-modulation picture is right, the normalized transconductance of these thick films (currently 0.069–0.08 mS/µm) should improve with optimized width and length without changing the material, because the pore network already provides volumetric access; the paper's own geometry normalization leaves this implication implicit.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 4 minor

Summary. This manuscript reports a water-based fabrication route, pH-induced aqueous phase separation, for producing porous PEDOT:PSS:PEI films, and it characterizes the resulting morphology, dry electronic conductivity, and organic electrochemical transistor performance. The central claim is that an interconnected pore network increases electrolyte access and reduces effective ion-transport distance, so that thick (>100 µm) channels can simultaneously achieve high transconductance and fast response; the authors present a comparison of PSS:PEI 1:1 and 1:2 films as their most direct evidence. The paper also contains explicit acknowledgements that impedance, capacitance, and ion-transport measurements are needed to confirm volumetric modulation, which is a genuine strength of the presentation.

Significance. If the central claim were fully supported, the work would establish internal morphology as an independent design parameter for mixed ionic-electronic conductors and would offer a scalable, water-based alternative to freeze-drying, aerogel, and hydrogel-templating routes. The paper is also valuable for clearly situating itself against recent literature on the chemistry-dependent role of porosity and for stating its own limitations. However, the current experimental design does not yet isolate morphology from composition and device geometry, so the significance is conditional on additional control experiments or a substantially more cautious interpretation.

major comments (4)
  1. [§1.3.3 and Table 1] The central morphology-dominance claim rests on comparing PSS:PEI 1:1 and 1:2 films, but these films differ in PEI content (3.4 vs 5.8 wt%, Table 1) as well as in pore architecture. The manuscript itself states that 'incorporation of PEI may further support ion transport by increasing water uptake and lowering the elastic modulus of the hydrated matrix' (§1.3.3), which provides a composition-based mechanism independent of pore connectivity. Because the dry two-probe conductivity match in Figure 3 does not control for hydrated electronic conductivity, ionic conductivity, or volumetric capacitance, the 66.7% higher transconductance of the 1:2 device cannot be uniquely attributed to morphology. The authors should either add wet-state impedance or capacitance measurements, use thickness-matched and composition-controlled devices, or soften the 'morphology as the dominant factor' claim.
  2. [§1.3.2 vs §1.1] The claim that 'both devices have identical macroscopic geometries' (Section 1.3.2) is contradicted by the reported nonuniform film thicknesses of approximately 80–200 µm in Section 1.1 for the very samples used. Since transconductance scales with channel thickness, a systematic thickness difference between the 1:1 and 1:2 devices could explain part of the observed 66.7% transconductance increase without invoking pore connectivity. Please report the thickness of each measured device, normalize per-device geometry, or use thickness-matched films for the central comparison.
  3. [§3.4 and §1.1] The electronic conductivity used to match the two compositions is measured on dry, air-dried films by a two-probe method (Section 3.4), whereas the OECT operates in an aqueous electrolyte. Section 1.1 states that the 1:1 film swells more strongly in water, which would lower its hydrated electronic conductivity and alter its ionic accessibility. Therefore the dry conductivity overlap in Figure 3 does not exclude conductivity differences under operating conditions. Wet-state conductivity or electrochemical impedance data are needed before pore connectivity can be identified as the dominant variable.
  4. [Abstract and §3.7] The abstract states that porous channels achieve 'a transconductance of 30 mS and a response time of 13 ms at an ultralow gate voltage of 0.05 V', but the transient response is measured for a gate-voltage step from 0 to 0.6 V (Section 3.7). The 0.05 V value is the gate bias at which the transconductance peaks, not the bias condition used for the 13 ms response time. This conflation of two different operating conditions in the abstract should be corrected.
minor comments (4)
  1. [§1.3.4] The thickness range is reported as 80–200 µm in Section 1.1 but as 120–200 µm in Section 1.3.4; please harmonize the two descriptions or explain why the ranges differ.
  2. [Figure 5B] The normalized transconductance is introduced as gm,n = gm,max/(W d L^-1), but the units and the exact definition of 'mS/µm' should be stated explicitly in the caption so that comparison with literature values is unambiguous.
  3. [§3.7] The text uses 'reaction time' when describing the 90% saturation time; this should be replaced with 'response time' for consistency with the rest of the manuscript.
  4. [Figure 4] The text refers to 'Figure 4 D–E' for transconductance, but the figure panel labels are not described in the caption; please make the panel labeling consistent between the text, figure, and caption.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: all central claims are direct measurements, and self-citations are limited to methods and background.

full rationale

This paper contains no mathematical derivation chain or fitted model; every central performance claim (30 mS transconductance, 13 ms response time, pore-network retention) is a directly reported measurement, not a quantity produced by substituting inputs into an equation. The morphology-dominance interpretation rests on an empirical two-composition comparison (PSS:PEI 1:1 vs 1:2) with matched dry two-probe conductivity, and while that comparison is confounded by composition and hydrated-state unknowns, confounding is a correctness risk, not a circularity. The self-citations are not load-bearing evidence for the performance claims: Rauer et al. [56] is cited only as the protocol for the two-probe conductivity measurement; Restrepo et al. [26] is cited as background for aqueous phase separation; Baig et al. [23] is cited for pH-shift-induced PEI:PSS complexation. None of these supplies the transconductance, response time, or pore-connectivity result. The paper explicitly flags its own missing validation: Section 1.3.3 states that 'Direct determination of ionic conductivity, electronic conductivity, volumetric capacitance, and diffusion impedance by electrochemical impedance spectroscopy or thickness-dependent capacitance measurements would provide quantitative validation of the proposed transport mechanism,' and Section 1.3.4 states that 'A definitive demonstration of complete volumetric modulation would nevertheless require thickness-dependent capacitance or impedance measurements.' These are honest limitations, not disguised inputs. No fitted parameter is renamed as a prediction, no uniqueness theorem is imported from the authors' prior work, and no ansatz is smuggled in by citation. The 'most direct evidence' passage is an observed correlation between morphology and device metrics, not a derivation that reduces to its own assumptions. Under the hard rules, an unverified assumption about hydrated conductivity is not circularity, so the appropriate verdict is no significant circularity.

Assumptions & free parameters 2 free parameters · 4 assumptions · 0 invented entities

The central performance claims depend on several domain assumptions rather than on fitted mathematical parameters. The most significant are that dry conductivity measurements transfer to the hydrated device state, that freeze-dried SEM images represent the wet pore structure, and that the two compared devices had equivalent geometry. These are not verified by the paper and are explicitly acknowledged as open for the volumetric-modulation claim.

free parameters (2)
  • DMSO content = 25 wt%
    Chosen as optimum in preliminary experiments (Supporting Information S1); affects conductivity, morphology, and mechanical properties, and is used in all main device films.
  • Annealing temperature and time = 140°C, 90 min
    Standard processing chosen for the films; annealing increases conductivity by a factor of three and affects pore retention, so the reported device performance depends on this fixed protocol.
assumptions (4)
  • domain assumption The dry two-probe conductivity measurement reflects the electronic conductivity of the hydrated film during OECT operation.
    Invoked in Section 1.3.3 when concluding that PSS:PEI 1:1 and 1:2 films have comparable electronic conductivity and therefore the gm difference is due to morphology. The 1:1 film swells more in water, so its hydrated conductivity may differ.
  • domain assumption The freeze-dried SEM cross-sections preserve the pore structure of the hydrated films.
    Section 1.1 and Figure 2 use freeze-drying to image pore connectivity; this assumes no collapse or alteration of the pore network during drying, which is particularly relevant for the 1:1 film that loses pore structure after annealing.
  • ad hoc to paper Only primary and secondary amine groups of branched PEI participate effectively in charge compensation.
    Section 1.1 uses this assumption to compute effective charge ratios of 1:0.7 and 1:1.4 for nominal PSS:PEI 1:1 and 1:2, explaining why the 1:2 composition is more stable. This is a simplified model based on literature on DNA/PEI complexes.
  • domain assumption The compared 1:1 and 1:2 OECT devices have identical macroscopic geometry (W and L), and thickness differences do not confound the comparison.
    Section 1.3.2 states both devices have identical macroscopic geometries, while Section 1.1 reports nonuniform film thicknesses of 80-200 µm. The gm comparison assumes thickness is either equal or accounted for.

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Cite this review

Pith. "Pith review of Morphology Engineering of Mixed Ionic Electronic Conductors through Aqueous Phase Separation." pith.science (2026). https://pith.science/paper/MLXMSKDB

@misc{pith2026260807130,
  author       = {Pith},
  title        = {Pith review of: Morphology Engineering of Mixed Ionic Electronic Conductors through Aqueous Phase Separation},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/MLXMSKDB}},
  note         = {Machine review of arXiv:2608.07130}
}
read the original abstract

The performance of organic electrochemical transistors (OECTs) is fundamentally governed by the interplay between ionic accessibility and electronic transport within organic mixed ionic-electronic conductors. Although increasing channel thickness enhances transconductance, it also prolongs ion transport, resulting in the well-known gain-speed trade-off. Here, we demonstrate that engineering the internal morphology of PEDOT:PSS:PEI films through pH-induced aqueous phase separation provides an effective route to mitigate this limitation. The resulting interconnected pore network promotes electrolyte penetration and increases the electrochemically addressable volume, while DMSO treatment and annealing enhance the continuity and ordering of the PEDOT-rich electronic phase. Consequently, porous OECT channels achieve a transconductance of 30 mS and a response time of 13 ms at an ultralow gate voltage of 0.05 V despite channel thicknesses exceeding 100 um. Comparison of films with comparable electronic conductivity but different pore architectures identifies morphology as the dominant factor governing device performance, supporting a transition from predominantly surface-limited modulation toward spatially distributed mixed ionic-electronic transport. Beyond demonstrating a scalable water-based fabrication strategy, this work establishes internal morphology as a design parameter that complements molecular structure and device geometry in organic mixed conductors, providing a general framework for the development of high-performance OECTs, soft bioelectronics, and future neuromorphic materials.

Figures

Figures reproduced from arXiv: 2608.07130 by the authors.

Figure 1
Figure 1. Schematic of the aqueous phase separation process: a homogeneous solution of [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Cross-sectional SEM images of PEDOT:PSS:PEI films. Films with PSS:PEI ratios of [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Electrical conductivity of PEDOT:PSS:PEI films as a function of coagulation bath [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: A) Schematic of the OECT measurement cell. B–C) Transfer characteristics and [PITH_FULL_IMAGE:figures/full_fig_p009_4.png]
Figure 5
Figure 5. Figure 5: A) Trade-off between response time and maximum transconductance. Literature values [PITH_FULL_IMAGE:figures/full_fig_p012_5.png]

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Pith tools

Reviewed August 10, 2026 · model on record in the stance chip above.