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REVIEW 4 major objections 4 minor 62 references

General and scalable vapor etching and transformation platform for two-dimensional materials

T0 review · 4 major / 4 minor · reviewed 2026-08-01 · deepseek-v4-flash

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Pith's one-line read This paper reports that hydrogen chloride vapor can selectively strip the A-element layers out of MAX phases, yielding a library of 36 two-dimensional carbides, nitrides, and carbonitrides—including the first semiconducting Hf2CTx—without l

desk verdict Vapor HCl etching works, Hf2CTx is new and credible, but the '36-material library' and 'semiconductor' claims run ahead of the demonstrated data. read the letter →

arxiv 2607.15581 v1 pith:IIT3VKT7 submitted 2026-07-17 cond-mat.mtrl-sci

Zhiguo Du , Jikai Zhang , Jonas Björk , Zongju Cheng , Ningjun Chen , Qi Zhao , Hao Chen , Yuxuan Ye
show 5 more authors
Guang Yang Haiyang Wang Bin Li Johanna Rosen Shubin Yang
This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords MXenesMAXphasesvaporetchinghydrogenchloridetwo-dimensionalmaterialssemiconductingHf2CTxsurfaceterminationscalablesynthesis
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's central claim is that a gas-solid reaction, rather than liquid acids, can make MXenes at scale. At 873–1073 K, HCl vapor reacts with the A element in a MAX phase and carries it away as a volatile chloride, leaving the transition-metal carbide/nitride layers intact; because the byproduct is a gas, nothing accumulates to block the etch. The authors support this with a thermodynamic map that predicts which MAX phases will etch selectively, and they demonstrate 12 MXenes, including the previously elusive semiconducting Hf2CTx. The broader assertion is that this solvent-free vapor platform is general: a library of 36 carbides, nitrides, and carbonitrides with conductivities spanning six orders of magnitude, and routine production to ten kilograms. If correct, it would turn MXene synthesis into a dry, cheap, scalable step.

What carries the argument

The load-bearing machinery is the reaction MAX + HCl(g) → MX + ACl_y(g) + H2(g), combined with a thermodynamic stability map built from density functional theory. The map places each MAX phase on a plot whose axes are the computed free-energy changes for MXene formation and for full disintegration; the diagonal sets the selectivity boundary. This is what turns a single etch into a library prediction: any MAX phase below the diagonal should yield the corresponding MXene, and experiments on 12 compounds confirm the trend. The volatility of ACl_y is equally important—it removes the byproduct continuously, which is why the etch proceeds in minutes and can be scaled to kilogram batches.

What would settle it

Take a MAX phase that the thermodynamic map places below the diagonal but that is not among the 12 experimentally demonstrated, run HCl vapor etching at 923 K, and check for a layered MXene. If the product is metal chlorides, unreacted MAX, or a non-layered residue, the universality claim fails. A narrower falsifier: measure four-probe resistance of a delaminated Hf2CTx film versus temperature; a metallic temperature dependence would contradict the claimed semiconductor.

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Extended reading notes

Core claim

The paper discovers that HCl vapor selectively removes A-layers from MAX phases via MAX + HCl(g) → MX (MXene) + ACl_y(g) + H2(g). The volatile ACl_y leaves the solid, preventing byproduct accumulation and allowing deep, sustained etching—fast enough to convert Ti4AlN3 to Ti4N3Tx in 25 minutes. A DFT-based thermodynamic stability map compares formation of the MXene against complete disintegration of the MAX phase; compositions below the diagonal etch selectively, whereas V2AlC and Cr2AlC, above the diagonal, do not. Twelve MXenes are experimentally made, including Zr2CTx and first Hf2CTx, whose optical absorption gives indirect bandgaps of 2.04 and 2.24 eV, and the ensemble spans six orders o

Load-bearing premise

The generality claim depends on the DFT thermodynamic ranking being the whole story: that HCl selectively volatilizes the A element while leaving the M-X framework intact, and that kinetic barriers, side chlorination of the metal, or trace-water oxidation do not overturn that ranking for any of the 36 library members.

Editorial extensions

If this is right

  • MXene production becomes a solvent-free, washing-free gas-solid process; the paper demonstrates 285 g in a single batch and routine 10 kg production, with lower water use and cost than wet or molten-salt routes.
  • The first synthesis of semiconducting Hf2CTx opens access to a predicted class of MXenes beyond metallic conductors, with reported indirect optical bandgaps of 2.04 eV for Zr2CTx and 2.24 eV for Hf2CTx.
  • Exposing MXenes to O2, H2S, Se, Te, or P vapor after etching changes their surface terminations, turning Ti4N3Tx from metallic Cl-terminated to semiconductor-like O-terminated and making it stable in base for three weeks and to 1100 K.
  • The platform edits the interior of the layers: CH4 or NH3 swaps C and N at the X-site, enabling carbide–nitride interconversion, and Sn or Al vapor inserts A layers between MX slabs to make 2D MAX phases with conductivities up to about 48,000 S/m.

Reading between the lines

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

  • Because the selectivity criterion is thermodynamic and the byproduct is volatile, the same design rule should extend to other non-van der Waals laminates whose A element forms a volatile chloride—this is my inference, not a claim the paper tests.
  • The semiconducting character of Zr2CTx and Hf2CTx is inferred from optical absorption; a direct four-probe transport measurement on delaminated flakes would confirm whether the bandgap is intrinsic and whether carrier mobility is useful.
  • The paper's batches are still batch processes; a continuous-flow reactor that feeds HCl gas and removes ACl_y vapor continuously is the obvious next scale-up step and is not demonstrated here.
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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. The paper reports a vapor-phase etching and transformation platform for MXene synthesis. The central reaction is MAX + HCl(g) → MX (MXene) + ACl_y(g) + H2(g), where HCl vapor selectively removes A-layers from MAX phases at 873–1073 K, producing layered MXenes without liquid etching or washing. The authors support this with DFT free-energy calculations comparing MXene formation versus MAX disintegration, presenting a thermodynamic stability map for many MAX chemistries (36 materials advertised). They experimentally demonstrate 12 MXenes, including first-time Hf2CTx and Zr2CTx, and report a six-order-of-magnitude spread in electrical conductivity, with Tauc-derived optical bandgaps of 2.04 eV and 2.24 eV for Zr2CTx and Hf2CTx, respectively. They further show post-synthetic termination exchange (O, S, Se, Te, P), X-site substitution (C/N), and transformation into Sn- or Al-intercalated 'MAXene' structures. Scalability is claimed through single-batch 285 g and routine 10 kg production.

Significance. If the claims hold, this would be a substantial advance in MXene synthesis: a solvent-free, scalable route that expands the accessible MXene family to previously elusive Zr/Hf-based semiconducting members and enables postsynthetic compositional and structural tailoring. The thermodynamic framework is independent (computed using DFT and thermochemical data, not fit to the measured conductivity or bandgap), which is a strength, and the experimental demonstrations cover a range of chemistries. The work combines synthesis, characterization, and computational screening in a way that could reframe MXene production. However, the central generality and 'library of 36' claim currently rest on only 12 demonstrated phases and a thermodynamic map that omits kinetic and side-reaction pathways. The semiconducting assignment is based on optical measurements and low powder conductivity rather than transport measurements. These load-bearing points need strengthening before the platform can be considered established at the claimed breadth.

major comments (4)
  1. [Abstract and §3 (Figs. 3A, 3E)] The abstract and Section 3 claim a 'library of 36 2D carbides, nitrides, and carbonitrides' and a universal synthesis, but the main text demonstrates only 12 MXenes experimentally. The remaining 24 compositions are not enumerated in the main text, and the thermodynamic stability map (Fig. 3A) is only a binary comparison of MXene formation versus total disintegration. The paper itself notes that Mo-based MAX phases show 'low reactivity' despite the thermodynamic framework, indicating that kinetics or side reactions can overturn the thermodynamic ranking. Since 'general' is a central claim, the authors should provide a full list of the 36 predicted compositions, mark which are experimentally verified, and discuss or measure kinetic limitations (e.g., time-dependent conversion, competing chlorination of M, passivation by trace H2O-derived oxide) for representative cases.
  2. [§3, Fig. 3E–G] The semiconducting assignment for Zr2CTx and Hf2CTx rests on Tauc plots from UV-vis diffuse reflectance (optical bandgaps 2.04 and 2.24 eV) and on a drop in electrical conductivity to 10^-2 S m^-1. No temperature-dependent conductivity, Hall-effect, or field-effect transistor data are provided to confirm semiconducting behavior. The conductivity values in Fig. 3E appear to come from pressed powders or films without stated measurement geometry or error bars; contact resistance and porosity can dominate. Given that the discovery of semiconducting MXenes is a headline result, transport measurements on delaminated flakes or at least carefully described pellet measurements are needed to distinguish intrinsic semiconductivity from poor interparticle contact.
  3. [§5 'Scalable production' and Fig. 1B] Scalability is claimed from a 285 g single-batch synthesis and routine 10 kg production, but no process details are given: reactor design, gas flow rates, temperature uniformity, batch-to-batch reproducibility, yield, or purity. A single photograph (Fig. 1B) is not sufficient evidence for a 'scalable platform' central claim. Provide quantitative scale-up data, including reaction time, conversion efficiency, and characterization (XRD, composition) at the largest scale, to substantiate the scalability.
  4. [§4 and Fig. 4D–G] The 'MAXene' structures (Cl-MX-[A-MX]_n-Cl) are claimed from atomic-resolution STEM images after Sn vapor treatment, but the XRD evidence (Fig. S72) shows only a weak broad peak, and no diffraction pattern or quantitative composition analysis is presented to confirm the stacking sequences and the absence of unreacted Sn or Sn-containing secondary phases. The claim that n can be 1, 2, and 4 is structural but not statistically supported. Given that this is presented as a new class of non-vdW layers, more evidence (e.g., EELS/EDX line profiles, simulated STEM images, or diffraction) is required.
minor comments (4)
  1. [Fig. 3E] No error bars or measurement uncertainty are shown for the conductivity values. At least three independent samples or measurements should be reported to support the six-order-of-magnitude spread.
  2. [Fig. 1C caption] The caption contains an incomplete phrase: 'as a function of HCl-to-MAX molar (nHCl/nMAX)' — likely missing 'ratio'.
  3. [§4, Fig. 4A] The notation M-X-T′ with T′ = O, S, Se, Te, P is used; clarify whether these are terminal sites or substitutional X-site doping, as both are discussed in the same section.
  4. [General] The term 'MAXenes' is introduced without a formal definition or comparison to existing nomenclature. Define it explicitly and note its relation to 'MAX phases' and 'MXenes'.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: independent DFT map validated by 12 syntheses; minor self-citations not load-bearing.

full rationale

The derivation chain is not circular. The central claim—HCl vapor selectively removes A-layers from MAX phases to form MXenes—is supported by an independent DFT thermodynamic model (Fig. 3A), which computes ΔG for MXene formation versus disintegration from first-principles MAX/MXene free energies and standard thermochemical data (refs 44, 52, 53) as a function of HCl pressure, temperature, and nHCl/nMAX. No parameter is fitted to the 12 experimental syntheses, the six-order conductivity spread, or the Zr2CTx/Hf2CTx bandgaps; those measurements are external validation of the map, not inputs that define it. The Mo-containing MAX phases are rationalized by a weak-Cl-bonding argument citing ref. 34 from the Björk/Rosen group, and the O-termination preference is said to be consistent with ref. 34, but these citations are ancillary and do not carry the generality claim. The map was also checked against expected failures (V2AlC, Cr2AlC). No equation is defined in terms of its target, no fitted parameter is renamed as prediction, and no load-bearing uniqueness theorem is imported from the authors' prior work. The score reflects only the presence of minor non-load-bearing self-citations, which do not amount to circularity.

Assumptions & free parameters 0 free parameters · 4 assumptions · 1 invented entities

No ad hoc fitted parameters are found for the central claims. The DFT stability map uses standard vdW-DF and thermochemical data; the only tunable is the HCl-to-MAX ratio, which is an experimental process variable rather than a fit. The main assumptions are domain-level: DFT thermodynamics is predictive, and phase purity is established by the reported characterization.

assumptions (4)
  • domain assumption MAX phases react with HCl(g) to produce volatile ACl_y(g) and H2(g) while preserving the M-X framework (MAX + HCl(g) → MX + ACl_y(g) + H2(g)).
    Central reaction in the section 'Synthesis of MXenes by vapor etching' (Fig. 1A). This is assumed to hold for all 36 claimed members, though only 12 MXenes are experimentally demonstrated in main text.
  • domain assumption DFT free-energy differences computed with vdW-DF accurately rank etching selectivity vs. disintegration for all considered MAX phases.
    Thermodynamic stability map (Fig. 3A, figs. S9–S35) is used to define the boundary between etchable and non-etchable phases; no kinetic corrections are included.
  • domain assumption Tauc analysis of UV-vis diffuse reflectance data correctly yields indirect optical bandgaps for Zr2CTx and Hf2CTx.
    Fig. 3F,G reports 2.04 and 2.24 eV indirect bandgaps; Tauc fitting of powder reflectance can be ambiguous, and no direct transport measurements (e.g., FET or Seebeck) are shown.
  • domain assumption The characterization suite (XRD, STEM, XAS, XPS, elemental analysis) unambiguously identifies phase purity and Cl/O termination.
    Used throughout Figs. 2–4 to convert measured signals into specific MXene structures; subtle mixed-termination or stacking faults could alter conductivity values.
invented entities (1)
  • MAXenes (Cl-MX-[A-MX]_n-Cl stacking) independent evidence
    purpose: Describe MXene sheets re-zippered with Sn or Al layers into 2D MAX-phase-like non-vdW layers.
    Atomic-resolution STEM and elemental mapping show Sn monolayers between MX slabs (Fig. 4D–G, fig. S73); however, stability and electronic properties are not independently measured beyond conductivity.

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Pith. "Pith review of General and scalable vapor etching and transformation platform for two-dimensional materials." pith.science (2026). https://pith.science/paper/IIT3VKT7

@misc{pith2026260715581,
  author       = {Pith},
  title        = {Pith review of: General and scalable vapor etching and transformation platform for two-dimensional materials},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/IIT3VKT7}},
  note         = {Machine review of arXiv:2607.15581}
}
read the original abstract

Two-dimensional (2D) nanomaterials derived from non-van der Waals (non-vdW) solids offer exceptional physicochemical properties, yet their synthesis is impeded by intrinsic covalent/metallic bonding and high surface reactivity of the precursors. Here, we report a general vapor-phase etching and transformation platform for producing a library of 36 2D carbides, nitrides, and carbonitrides, exhibiting electrical conductivities spanning six orders of magnitude. Using reactive vapors like hydrogen chloride, we selectively remove A-layers from MAX phases to yield well-defined layers (MXenes), including previously inaccessible semiconducting Hf2CTx. By varying the reactive vapor environment, MXenes can be engineered at X-site and surface-termination site and even be transformed into non-vdW layers such as 2D MAX phases. This general and scalable vapor-phase platform reframes 2D material synthesis, opening new avenues for various applications.

Figures

Figures reproduced from arXiv: 2607.15581 by the authors.

Figure 2
Figure 2. Characterizations of a typical MXene Ti4N3Tx synthesized by vapor etching of Ti4AlN3. (A) Schematic illustration of the transformation of MAX Ti4AlN3 to MXene Ti4N3Tx under HCl gas. (B) SEM image of Ti4N3Tx, showing a typical accordion-like structure. (C) XRD patterns of MAX Ti4AlN3 and accordion-like Ti4N3Tx, exhibiting the presence of typical (002) peak for MXene. (D) AFM image and corresponding height profiles of… view at source ↗

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Pith tools

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