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REVIEW 3 major objections 4 minor 57 references

XANES absorption spectra of penta-graphene and penta-SiC2 with different terminations: a computational study

T0 review · 3 major / 4 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read This computational study predicts X-ray absorption fingerprints that distinguish penta-graphene, penta-SiC2, and their hydrogenated and hydroxylated forms.

desk verdict Useful first-pass computational XANES reference for penta-graphene and penta-SiC2, but the 'reliable fingerprints' claim needs an energy calibration before experimentalists should lean on it. read the letter →

arxiv 2508.00704 v1 pith:PL7XWBXY submitted 2025-08-01 cond-mat.mtrl-sci cond-mat.mes-hall

Andrea Pedrielli , Tommaso Morresi , Simone Taioli This is my paper
classification cond-mat.mtrl-scicond-mat.mes-hall
keywords penta-graphenepenta-SiC2XANESX-rayabsorptionnear-edgespectroscopytwo-dimensionalmaterialscore-holepseudopotentialdensityfunctionaltheoryhydrogenation
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 asks whether two all-pentagon two-dimensional materials, penta-graphene and penta-SiC2, and their chemically terminated variants can be told apart by X-ray absorption. Using first-principles core-hole calculations, it computes C, Si, and O K-edge XANES spectra for pristine, hydrogenated, and hydroxylated forms and finds that peak positions, shapes, and polarization dependencies differ systematically between materials and terminations. The authors conclude that these spectra can serve as reliable fingerprints for experimental identification. If that is correct, the calculations give experimentalists a reference for recognizing these elusive phases and for engineering their X-ray absorption in optical devices.

What carries the argument

The central object is the K-edge XANES spectrum computed for each inequivalent absorbing site with a core-hole pseudopotential: after X-ray absorption the excited atom's 1s electron is removed and the resulting hole is included in the pseudopotential, so the spectrum reflects the local chemical environment and coordination. The Lanczos chain algorithm evaluates the absorption cross section from the ground-state density without enumerating empty states, and dipole selection rules restrict K-edge transitions to final states with p character or s/p hybrids. Site-resolved spectra are then averaged over the inequivalent sites in the unit cell and broadened with a Lorentzian of 0.8 eV full width at half maximum.

What would settle it

Measure C and Si K-edge XANES on a phase-pure sample of penta-graphene or penta-SiC2; the fingerprint claim fails if the predicted three-plateau C spectrum (283–288, 290–300, and above 305 eV) and the double Si peaks near 1844 and 1857 eV are absent or shifted by more than the several-electronvolt error typical of the uncalibrated scheme.

Watch

Extended reading notes

Core claim

On the paper's own terms, the central finding is that pristine, hydrogenated, and hydroxylated penta-graphene, silicon-substituted penta-graphene, and pristine and hydrogenated penta-SiC2 each have distinct C, Si, and O K-edge XANES signatures in peak position, shape, and polarization dependence, so these spectra can serve as reliable fingerprints for experimental identification. Notable discriminators are the 283–288 eV plateau and the site-2 π* peak near 285 eV in pristine penta-graphene, which hydrogenation or hydroxylation removes, and the Si K-edge region around 1840–1860 eV, where coordination site and host lattice change the number, position, and polarization of the peaks.

Load-bearing premise

The fingerprint claim stands on the assumption that the uncalibrated core-hole density functional calculation reproduces absolute XANES peak positions and shapes closely enough for unambiguous identification, yet no comparison to measured spectra is made in the paper.

Editorial extensions

If this is right

  • XANES can distinguish pristine penta-graphene from its hydrogenated and hydroxylated forms, because the low-energy plateau at 283–288 eV and the site-2 π* peak near 285 eV vanish on termination.
  • The C K-edge spectrum of penta-graphene reproduces graphene's σ* peaks near 293, 298, and 303 eV for the three-coordinated sites, so XANES can recognize the sp2-like sublattice within the pentagonal network.
  • Si K-edge spectra separate a single substitutional Si dopant in penta-graphene from true penta-SiC2 by the high-energy peak structure above 1850 eV.
  • Polarization-dependent XANES records could reveal the orientation of penta-graphene or penta-SiC2 flakes, since in-plane versus out-of-plane responses are computed to differ strongly in pristine cases.

Reading between the lines

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

  • Beyond the paper's explicit claims: the loss of the low-energy plateau upon hydrogenation or hydroxylation could act as a general marker for conversion of sp2 to sp3 carbon sites in other pentagonal carbon networks.
  • The strong site and polarization sensitivity of the Si K-edge suggests a route beyond identification: XANES could locate a single Si dopant within a penta-graphene lattice, provided the computed few-electronvolt energy accuracy holds.
  • A testable extension would be to recompute spectra with a self-consistent, many-body treatment of the core hole and compare absolute peak positions to synchrotron measurements, since the current uncalibrated energies are the main uncertainty.
  • Because the spectra are computed for isolated 3×3 supercells, an extension to finite temperature or to supported, substrate-bound samples would test whether the fingerprints survive realistic experimental conditions.
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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

3 major / 4 minor

Summary. The authors present first-principles XANES calculations for penta-graphene in pristine, hydrogenated, and hydroxylated forms, for penta-graphene with a single Si substitution, and for pristine and hydrogenated penta-SiC2. Using the XSpectra code within QUANTUM ESPRESSO with PBE and core-hole pseudopotentials, they compute C, Si, and O K-edge spectra for inequivalent sites and polarizations, and form weighted-average total spectra. They conclude that the calculated peak positions, shapes, and polarization dependencies can serve as reliable fingerprints for experimental identification.

Significance. If the absolute energy scale were validated, the systematic set of computed spectra would be a useful reference for future experimental characterization of these hypothetical materials. The work is methodologically standard and internally consistent: no fitting to experimental data, and the only manually chosen parameter is the Lorentzian broadening. However, the central fingerprint claim is not established because the absolute energy scale of PBE core-hole XANES is not benchmarked against experiment. The paper would be acceptable if the claim is softened to 'predicted spectra' or if a calibration against measured spectra is added.

major comments (3)
  1. [Section 4 and Section 3.1] The 'reliable fingerprints' claim in the Conclusions requires absolute energy accuracy. The only comparison with experiment is qualitative: site-2 peaks at 293/298/303 eV are said to correspond to graphene's sigma peaks (citing refs [25,55-57]), but no peak-position residuals or calibration shift are reported. Since PBE core-hole XANES can have site- and edge-dependent shifts of several eV, and the sp3 carbon site and all Si K-edge spectra are unbenchmarked, the fingerprints are not validated. Provide a quantitative benchmark against measured C K-edge (e.g., graphene) and Si K-edge (e.g., SiC) spectra, or explicitly restrict the claim to relative spectral features.
  2. [Section 2.2 and Section 3.1] The 'weighted average' of spectra over inequivalent sites is not defined. It is not stated what weights were used (stoichiometric 1:2 for site 1:site 2, or equal weights). Without this, the total spectra in Figs. 3, 5, 7, 9, 10, 12, and 14 cannot be reproduced, which is a reproducibility problem for the fingerprint claim.
  3. [Section 2.1] The statement that a 3x3 supercell is 'sufficient for the convergence of the spectra' is not supported by any presented convergence data. Similarly, 'After convergence tests' for cutoff and k-points is asserted but not shown. Because the central claim concerns absolute peak positions, demonstrate supercell-size, cutoff, and k-point convergence of peak energies (e.g., a table of first-peak positions vs supercell size).
minor comments (4)
  1. [Section 3.6] The first paragraph contains a duplicated sentence: 'We report in Fig. 11 the Si K-edge XANES spectra ... and in Fig. 12 the spectra for the C K-edge.' is immediately followed by 'We show in Fig. 11 the Si K-edge XANES spectra ...' Remove one.
  2. [Section 2.1] In the sentence 'In addition, penta-SiC and hydrogenated penta-SiC are shown in panels D) and E)', 'penta-SiC' should be 'penta-SiC2' to match the figure and the rest of the manuscript.
  3. [Figures 2-14] The x- and y-polarized spectra coincide in many figures; the text notes this, but the red and green lines are indistinguishable in print. Consider using dashed/dotted lines for one of the polarizations or stating the coincidence directly in each caption.
  4. [Section 3.1] The description of the total spectra as 'three plateaus in the ranges 283–288, 290–300 and above 305 eV' is imprecise because the spectra show peaks, not plateaus; rephrase to 'three groups of peaks' or similar.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the XANES fingerprints are computed from first-principles DFT without fitting to measured spectra or importing the target result from self-citations.

full rationale

The paper's central claim is that calculated XANES peak positions, shapes, and polarization dependencies can serve as reliable fingerprints for identifying penta-graphene, penta-SiC2, and their hydrogenated/hydroxylated variants. The spectra are produced by standard DFT-based XANES calculations (XSpectra/Quantum ESPRESSO with ultrasoft core-hole pseudopotentials and the PBE functional). No measured XANES spectrum of these materials enters the calculation, no parameter is fitted to experimental data, and the only manually chosen parameter, the 0.8 eV Lorentzian broadening, affects line shape but does not encode the peak positions or the fingerprint pattern. The comparison with graphene in Section 3.1 is an external qualitative benchmark, not an input to the calculation. The paper does cite prior work by its own authors, but those citations support introductory background and methodological context, not the load-bearing fingerprint derivation. The absence of a quantitative experimental energy-scale validation is a real accuracy concern, but it is a correctness/validation issue, not circularity: the claimed fingerprints are not equivalent to the inputs by construction.

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

The central properties are computed from first-principles DFT, so no free parameters encode the target peaks; the sole spectral-shaping choice is the 0.8 eV Lorentzian broadening. The main axioms are standard approximations of XANES theory, the supercell convergence, and the structural models of disputed materials.

free parameters (1)
  • Lorentzian broadening FWHM = 0.8 eV
    Chosen broadening for spectral convolution. It affects peak shape and visibility of fine features, though not the peak positions, and is not fitted to target experimental data.
assumptions (4)
  • domain assumption PBE functional with core-hole pseudopotential yields XANES spectra accurate enough for fingerprinting
    Section 2.2 states the core-hole is included in the pseudopotential and PBE is used, but no comparison to experimental spectra is made to validate absolute energy accuracy.
  • domain assumption Dipole approximation selects only 1s to p or s/p transitions
    Section 2.2: 'XANES spectra are calculated in the dipole approximation; therefore, only the transitions from 1s to np or s/p hybridized orbitals are examined.' This is standard but restricts spectral features.
  • domain assumption 3x3 supercell with 2.0 nm vacuum is converged and isolates the single core-hole interaction
    Section 2.1 states the supercell size and vacuum dimension were chosen to ensure convergence and avoid spurious interactions, but no convergence data are shown.
  • domain assumption The modeled structures represent the relevant experimental phases of penta-graphene and penta-SiC2
    The introduction notes penta-graphene stability is controversial (ref 39). All fingerprints depend on the assumed structure, including full hydrogenation or hydroxylation coverages and the silicon substitution site.

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Cite this review

Pith. "Pith review of XANES absorption spectra of penta-graphene and penta-SiC2 with different terminations: a computational study." pith.science (2026). https://pith.science/paper/PL7XWBXY

@misc{pith2026250800704,
  author       = {Pith},
  title        = {Pith review of: XANES absorption spectra of penta-graphene and penta-SiC2 with different terminations: a computational study},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/PL7XWBXY}},
  note         = {Machine review of arXiv:2508.00704}
}
read the original abstract

In recent research, penta-graphene and penta-SiC2 have emerged as innovative 2D materials consisting exclusively of pentagons. However, there is still a significant gap in the theoretical characterization of these materials, which hinders progress in their synthesis and potential technological applications. This study aims to close this gap by investigating the X-ray absorption near-edge spectroscopy (XANES) of these materials through ab initio calculations. In particular, we analyze the XANES spectra of penta-graphene in its pristine, hydrogenated, and hydroxylated states, and we investigate the effects of substitution by a single silicon in both penta-graphene and pentagraphane. In addition, we calculate the XANES spectra for pristine and hydrogenated penta-SiC2. This work sets the stage for the possible identification of penta-graphene and penta-SiC2 phases by X-ray spectroscopy at the experimental level and lays the foundation for the future engineering of the absorption properties of these materials in optical devices.

Figures

Figures reproduced from arXiv: 2508.00704 by the authors.

Figure 1
Figure 1. A) 3×3 supercell of penta-graphene in which tri-coordinated sites are colored green and the four￾coordinated atoms are colored purple. The unit cell is framed by black lines, and the two non-equivalent sites are numbered (1) and (2). In penta-graphene, all atoms are carbon atoms, while in penta-SiC2, the tri-coordinated sites are occupied by carbon atoms and the four-coordinated sites by silicon atoms. The image was… view at source ↗
Figure 2
Figure 2. Theoretical C K-edge XANES spectra of a 3×3 unit cell of penta-graphene for inequivalent positions of the core-hole within the unit cell, for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in the diagram) is the same as that for y-polarized light (green line) [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Theoretical C K-edge XANES spectra of a 3×3 unit cell of penta-graphene, averaged over all inequivalent positions of the core-hole within the unit cell, for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in the diagram) is the same as that for y-polarized light (green line). 3.3. Hydroxylated penta-graphene We analyzed the XANES response in hydroxylate… view at source ↗
Figures from the paper (11 more)
Figure 4
Figure 4. Figure 4: Theoretical C K-edge XANES spectra of a 3×3 supercell of hydrogenated penta-graphene for inequivalent positions of the core-hole within the unit cell, for x-, y-, and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible i…
Figure 5
Figure 5. Figure 5: Theoretical C K-edge XANES spectra of a 3×3 supercell of hydrogenated penta-graphene averaged over all inequivalent positions of the core-hole within the unit cell, for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, …
Figure 6
Figure 6. Figure 6: Theoretical C K-edge XANES spectra of a 3×3 supercell of hydroxylated penta-graphene for inequivalent positions of the core-hole within the unit cell, for x-, y- and z-polarized electric fields [PITH_FULL_IMAGE:figures/full_fig_p009_6.png]
Figure 7
Figure 7. Figure 7: Theoretical C K-edge XANES spectra of a 3×3 supercell of hydroxylated penta-graphene averaged over all inequivalent positions of the core-hole within the unit cell, for x-, y- and z-polarized electric fields [PITH_FULL_IMAGE:figures/full_fig_p010_7.png]
Figure 8
Figure 8. Figure 8: Theoretical O K-edge XANES spectra of a 3×3 supercell of hydroxylated penta-graphene for x-, y- and z-polarized electric fields [PITH_FULL_IMAGE:figures/full_fig_p010_8.png]
Figure 9
Figure 9. Figure 9: Theoretical Si K-edge XANES spectra of a 3×3 supercell of penta-graphene for inequivalent positions of the core-hole within the unit cell, for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in the diagram…
Figure 10
Figure 10. Figure 10: Theoretical Si K-edge XANES spectra of a 3×3 supercell of hydrogenated penta-graphene for different positions of the core hole within the unit cell, for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in …
Figure 11
Figure 11. Figure 11: Theoretical Si K-edge XANES spectra of a 3×3 supercell of penta-SiC2 with the core-hole at site 1 for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in the diagram) is the same as that for y-polarized li…
Figure 12
Figure 12. Figure 12: Theoretical C K-edge XANES spectra of a 3×3 supercell of penta-SiC2 with the core-hole at site 2 for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in the diagram) is the same as that for y-polarized lig…
Figure 13
Figure 13. Figure 13: Theoretical Si K-edge XANES spectra of a 3×3 supercell of hydrogenated penta-SiC2 with the core-hole at site 1 for x-, y- and z-polarized electric fields. We note that the spectrum for x-polarized X-rays (red line, not visible in the diagram) is the same as that for y…
Figure 14
Figure 14. Figure 14: Theoretical C K-edge XANES spectra of a 3×3 supercell of hydrogenated penta-SiC2 with the core-hole at site 2 for x-, y- and z-polarized electric fields. In [PITH_FULL_IMAGE:figures/full_fig_p014_14.png]

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Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.