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Laser-Synthesized Amorphous PdSe$_{\mathrm{2-x}}$ Nanoparticles: A Defect-Rich Platform for High-Efficiency SERS, Photocatalysis, and Photothermal Conversion

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Pith's one-line read Femtosecond laser ablation in liquid converts crystalline PdSe2 into amorphous, selenium-deficient PdSe2-x nanoparticles whose defect states simultaneously deliver plasmon-free SERS enhancement above $10^6$, a fifty-fold rise in…

desk verdict Credible synthesis of amorphous PdSe2-x, but the SERS 'plasmon-free' claim and the headline EF rest on a missing aluminum control and a concentration-normalization artifact; the paper deserves peer review but needs major revision. read the letter →

arxiv 2507.21918 v1 pith:2JABGYWK submitted 2025-07-29 cond-mat.mtrl-sci physics.chem-ph

Andrei Ushkov , Nadezhda Belozerova , Dmitriy Dyubo , Ilya Martynov , Alexander Syuy , Daniil Tselikov , Georgy Ermolaev , Sergey V. Bazhenov
show 11 more authors
Roman I. Romanov Ivan Kruglov Anton A. Popov Alexander Chernov Alexey D. Bolshakov Sergey Novikov Andrey A. Vyshnevyy Aleksey Arsenin Andrei V. Kabashin Gleb I. Tselikov Valentyn Volkov
This is my paper · ORCID
classification cond-mat.mtrl-sciphysics.chem-ph
keywords palladiumdiselenideamorphousnanoparticlesfemtosecondlaserablationinliquidseleniumvacanciesplasmon-freeSERSphotocatalysisphotothermalconversiondefectengineering
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 femtosecond laser ablation in liquid can push a transition-metal dichalcogenide out of its stable crystal form and that the resulting amorphous, selenium-deficient phase is functionally richer, not merely degraded. Ablating a crystalline PdSe2 target in water yields stable PdSe2-x nanoparticles, with x about 1, that the paper characterizes as dense in selenium vacancies and coordinatively unsaturated sites. On those particles it reports Raman signal enhancement above $10^6$ without plasmonic metals, a fifty-fold higher photocatalytic dye-degradation rate per unit mass than crystalline flakes, and photothermal conversion efficiency up to 83% under 830 nm light. The claim matters because it would turn one laser step into a general top-down route for defect-engineered two-dimensional materials for sensing, water treatment, and photothermal therapy.

What carries the argument

The central object is the amorphous, non-stoichiometric nanoparticle phase PdSe2-x produced by femtosecond laser ablation in liquid, a disordered palladium selenide in which the selenium-to-palladium ratio drops from about 2:1 to about 1:1. The mechanism the authors invoke is a high density of selenium vacancies and coordinatively unsaturated surface sites created by amorphization. These defects do two jobs: they introduce mid-gap electronic states that align with adsorbed dye molecules for resonant charge-transfer SERS and broaden optical absorption for photocatalysis and photoheating, and they act as adsorption anchors and local dielectric-confinement hotspots in aggregates that concentrate the Raman field without plasmon resonances.

What would settle it

A decisive test would take the same PdSe2-x colloid, remove or passivate the surface oxide without changing the amorphous core (for example by a brief dilute-acid wash or mild reduction), and re-measure the SERS enhancement factor, the mass-normalized photocatalytic rate, and the photothermal conversion efficiency. If the 50-fold photocatalytic advantage and the near-83% photothermal efficiency survive oxide removal, the amorphous selenium-vacancy network is doing the work; if the numbers collapse, the oxide surface is the true functional layer.

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Extended reading notes

Core claim

The paper's central discovery is that pulsed laser ablation in liquid can stabilize an amorphous palladium selenide phase that the crystalline PdSe2 precursor does not possess. The ablated nanoparticles are not merely smaller crystals: electron diffraction shows amorphous halos, Raman shows broad bands instead of the sharp A1g and A3g modes, and the composition shifts from roughly two selenium atoms per palladium to roughly one, corresponding to PdSe2-x with x about 1. That selenium deficit and the associated coordinatively unsaturated sites are presented as the microscopic origin of three emergent functions: SERS enhancement factors up to about $1.2 \times 10^6$ for crystal violet at $10^{-9}$ M, pseudo-first-order methylene blue photodegradation whose mass-normalized rate constant is about fifty times that of crystalline flakes, and photothermal conversion efficiency rising from 72% for 51 nm particles to 82-83% for 11 nm particles under 830 nm illumination. The paper argues these functions arise from a synergy of defect-state charge transfer, dielectric-confinement hotspots at particle aggregates, and broad sub-gap absorption, all absent in the ordered precursor.

Load-bearing premise

The load-bearing premise is that selenium vacancies and coordinatively unsaturated sites in the amorphous PdSe2-x phase, rather than the substantial Pd-O and Se-O surface oxides or any residual crystalline domains seen in the XPS and EDX data, are what drive the SERS, photocatalytic, and photothermal gains.

Editorial extensions

If this is right

  • A single femtosecond-laser run produces colloids that remain stable for at least a month, so the defect-rich state can be stored without ligands or inert atmosphere.
  • Differential centrifugation tunes mean particle size from about 51 nm down to 11 nm and raises photothermal conversion efficiency from 72% to about 83%, giving size-tunable heat agents from one synthesis.
  • Detection limits reach $10^{-9}$ M for crystal violet, rhodamine 6G, rhodamine B, and methyl orange, with enhancement factors above $10^6$ for crystal violet.
  • Mass-normalized photocatalytic methylene blue degradation is about 50 times faster for the nanoparticles than for crystalline flakes, even though the nanoparticle loading is 30 times lower.
  • Because ablation starts from a bulk target and works in water, the route is compatible with continuous-flow reactors, which the paper identifies as the scaling path.

Reading between the lines

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

  • An untested corollary is that mildly annealing or re-selenizing the nanoparticles should erase the selenium vacancies and, if the paper's mechanism is right, sharply lower the SERS, photocatalytic, and photothermal performance; this would provide a clean control experiment.
  • The XPS data show substantial Pd-O and Se-O bonding, so credit for the functions may belong partly to a surface oxide layer; the paper does not separate the two contributions.
  • The same laser-amorphization route may extend to other platinum-group dichalcogenides, where crystalline phases are also thermodynamically favored and a defect-rich amorphous phase could be similarly functional.
  • The near-83% photothermal ceiling at small particle size suggests absorption by the amorphous defect network, not Mie scattering, dominates; comparing measured PCE with Mie-theory predictions for crystalline PdSe2 of the same sizes would test that reading.
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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 / 5 minor

Summary. This manuscript reports the femtosecond laser ablation in liquid (PLAL) of a crystalline PdSe2 target to produce amorphous, non-stoichiometric PdSe2-x nanoparticles (x ≈ 1). The authors characterize the product by TEM/SAED, Raman, EDX, XPS, and photoluminescence, and they measure three functionalities: SERS with reported enhancement factors up to 10^6, photocatalytic degradation of methylene blue with a claimed 50-fold improvement in mass-normalized activity over crystalline flakes, and photothermal conversion efficiencies up to 83% under 830 nm illumination. The central claim is that selenium vacancies and coordinatively unsaturated sites created by amorphization are responsible for the enhanced performance, and that the nanoparticles constitute a defect-rich, plasmon-free multifunctional platform.

Significance. If fully substantiated, the work would provide a simple, scalable route to defect-engineered amorphous TMDC nanoparticles with simultaneous SERS, photocatalytic, and photothermal functionality. The structural evidence for amorphization (SAED halos, Raman band broadening, XPS shifts, EDX stoichiometry) is credible and well presented. The comparison between amorphous nanoparticles and crystalline flakes for SERS and photocatalysis is a useful design principle, and the photothermal study includes a literature benchmark and size-fraction measurements. The main weakness is that the SERS claim currently rests on substrates fabricated on metallic aluminum without a bare-aluminum control, so the 'plasmon-free' mechanism is not established. In addition, the attribution of the functional gains to selenium vacancies is confounded by the substantial Pd-O and Se-O bonding revealed by XPS, and the photocatalytic 50-fold claim depends on an unverified linearity assumption in mass normalization. These issues are fixable with additional control experiments and analysis, but they directly affect the paper's headline claims.

major comments (4)
  1. [Section 4.2.5 and Section 2.3] The SERS substrates are prepared by drop-casting the nanoparticle colloid onto an aluminum surface (Section 4.2.5), yet no baseline measurement on bare aluminum with the same dye deposition is reported. At 532 and 633 nm, a rough aluminum film can provide electromagnetic enhancement, and it can also act as a back-reflector. Without a bare-Al control, or without comparable SERS measurements on a non-metallic substrate (e.g., glass or silicon), the observed enhancement factors cannot be assigned to the amorphous PdSe2-x defect states. The 'plasmon-free' label in the abstract and Section 2.3 is therefore unsupported. Table 1 also shows that the derived EF increases monotonically as dye concentration decreases (e.g., CV at 1617 cm^-1 from 170 at 10^-4 M to 1.23×10^6 at 10^-9 M), which is a concentration-normalized analytical factor rather than a fixed per-molecule enhancement; the absence of film thickness and coverage characterization further prevents a quantitative assignment of the enhancement mechanism.
  2. [Section 2.1, Figs. 2f and 2g] The XPS data show new Pd 3d peaks assigned to PdO2 (343.70 eV and 337.90 eV) and a Se 3d peak assigned to Se-O (58.50 eV), and the EDX data reveal a significant oxygen content. The manuscript attributes the SERS, photocatalytic, and photothermal performance to selenium vacancies and coordinatively unsaturated sites, but it does not separate the contribution of the surface oxide phases from the proposed amorphous defect network. Since surface oxides can themselves act as charge-transfer mediators or active sites, the central mechanistic claim that the 'defect-rich platform' is the cause of the observed enhancements is not uniquely established. Additional experiments (e.g., controlled surface etching, comparison with deliberately oxidized crystalline PdSe2, or oxide-free synthesis conditions) would be needed to support the attribution.
  3. [Section 2.4 and Section 4.2.6] The 50-fold photocatalytic enhancement is obtained by normalizing the pseudo-first-order rate constant by catalyst mass concentration: k = 0.0244 min^-1 at 0.022 mg/mL for nanoparticles versus k = 0.0138 min^-1 at 0.66 mg/mL for flakes. This normalization assumes that the rate constant is linear in catalyst loading over the studied range, an assumption that is not tested or justified. If the reaction is limited by light absorption, surface area, or mass transfer, the mass-normalized comparison may overstate the intrinsic activity difference. The manuscript should include loading-dependent rate measurements or another justification for the normalization before the factor-of-50 claim is accepted.
  4. [Section 2.2 and Fig. 3d] The photothermal conversion efficiency (PCE) of 83% is a headline result, but the main text does not provide the heating/cooling curves, the model equation, or the experimental parameters used to extract PCE; these are deferred to Supplementary Note 2. The zero-size asymptote of the experimental PCE curve (η ≈ 0.83) is attributed to nanoparticle agglomeration, but no agglomeration data are presented. Since the abstract reports this value without qualification, the reliability of the PCE extraction should be demonstrated in the main text or the claim should be softened to the measured values for specific size fractions (e.g., 82% for 11 nm).
minor comments (5)
  1. [Section 2.4] The text says the nanoparticles exhibit 'two orders of magnitude higher specific activity,' but the reported values (1.11 versus 0.021 min^-1 mL/mg) give a factor of roughly 53, which is one and a half orders of magnitude; please correct this overstatement.
  2. [Figure 5b caption] The caption uses 'C0/Ct' while the text and kinetics equations use 'Ct/C0'; the axis label and caption should be made consistent.
  3. [Section 2.3 references] References [58] and [59] are cited for the Raman spectra of crystal violet and rhodamine B, but these references are about laser-induced periodic surface structures and appear mismatched; please verify the citations and replace them with appropriate SERS spectral references.
  4. [Section 4.2.5 and keywords] There are minor typographical issues: '2µl' should be '2 µL', 'drop casted' should be 'drop-cast', and the keyword 'nanoparicles' is misspelled as 'nanoparticles'.
  5. [Section 2.1] The XPS discussion states 'binding energies of Pd 3d3/2 (341.97 eV), Pd 3d5/2 (336.69 eV PdOx/Pd)', which is ambiguous because the PdOx/Pd label appears only for one peak; clarify the assignment.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the headline metrics are measured or compared against independent benchmarks, and the self-citations are contextual, not load-bearing.

full rationale

The derivation chain is not circular. The SERS enhancement factors are obtained from directly measured spectra via the standard ratio EF = I_SERS/I_RS × C_RS/C_SERS (Section 2.3, Table 1), with crystalline PdSe2 flakes as an independent control; no parameter is fitted to force the >10^6 result. The photothermal efficiencies (η = 72–82%) come from heating/cooling measurements at 830 nm (Section 4.2.4), while the theoretical PCE curves in Fig. 3d are stated to use literature refractive-index data (Supplementary Note 3), so the theory is not fitted to the measured PCE. The photocatalytic 50-fold comparison is a transparent calculation from measured pseudo-first-order rate constants and independently weighed concentrations (Section 2.4). The self-citations [30,38,44] supply synthesis context, Raman peak references, or a bandgap value that is also supported by independent references [21,39]; none is load-bearing for the central defect-based mechanism, and no uniqueness theorem or ansatz is imported from prior work by the same authors. The main caveat is experimental rather than circular: Section 4.2.5 states that SERS substrates were drop-cast onto an aluminum surface, and no bare-aluminum control is reported, so the 'plasmon-free' attribution is under-supported. That gap is a confounding-control issue, not a reduction of the conclusion to its own inputs, and it does not change the circularity score.

Assumptions & free parameters 0 free parameters · 6 assumptions · 0 invented entities

No numbers in the main text are fitted to make the central claim work: the photocatalytic rate constants are measured outputs, not free parameters. The key quantitative assumptions sit in the model choices (SERS EF baseline, PCE heat-loss model in missing Supplementary Note 2, pseudo-first-order kinetics) and in the attribution of effects to amorphous Se vacancies rather than surface oxides. No new particles, fields, or dimensions are introduced.

assumptions (6)
  • standard math Lambert-Beer law converts absorbance at 665 nm to MB concentration.
    Used to compute Ct/C0 in the photocatalytic experiments; assumes no strong scattering or absorption interference from the nanoparticle suspension.
  • domain assumption The amorphous phase is stable and is the cause of the enhanced properties.
    SAED and Raman support amorphization, but stability is demonstrated only by one-month visual inspection and the oxidation chemistry is not controlled.
  • domain assumption SERS enhancement is chemical and defect-mediated, not an artifact of aggregation, fluorescence, or residual crystallinity.
    Argued in Section 2.3; no experiment isolates these channels, and the concentration-dependent EF suggests adsorption effects dominate at low concentrations.
  • domain assumption Photodegradation of MB is photocatalytic rather than adsorption or photolysis.
    No catalyst-free or dark-control experiments are reported; the 30-minute dark pre-adsorption is the only control.
  • domain assumption Photothermal PCE model in Supplementary Note 2 correctly separates absorption, scattering, and heat losses.
    The formula is not in the arXiv version; the main text reports only extinction, not absorption, so the measured 72-83% values cannot be audited.
  • ad hoc to paper The zero-size PCE asymptote of about 0.83 is due to agglomeration.
    Offered without supporting data ('it could be caused by NP agglomeration'); not load-bearing for the main claim but flagged as a post-hoc explanation.

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Cite this review

Pith. "Pith review of Laser-Synthesized Amorphous PdSe$_{\mathrm{2-x}}$ Nanoparticles: A Defect-Rich Platform for High-Efficiency SERS, Photocatalysis, and Photothermal Conversion." pith.science (2026). https://pith.science/paper/2JABGYWK

@misc{pith2026250721918,
  author       = {Pith},
  title        = {Pith review of: Laser-Synthesized Amorphous PdSe$_\mathrm2-x$ Nanoparticles: A Defect-Rich Platform for High-Efficiency SERS, Photocatalysis, and Photothermal Conversion},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/2JABGYWK}},
  note         = {Machine review of arXiv:2507.21918}
}
abstract

The control of material properties at the atomic scale remains a central challenge in materials science. Transition metal dichalcogenides (TMDCs) offer remarkable electronic and optical properties, but their functionality is largely dictated by their stable crystalline phases. Here we demonstrate a single-step, ligand-free strategy using femtosecond laser ablation in liquid to transform crystalline, stoichiometric palladium diselenide (PdSe$_{\mathrm{2}}$) into highly stable, amorphous, and non-stoichiometric nanoparticles (PdSe$_{\mathrm{2-x}}$, with x$\approx$1). This laser-driven amorphization creates a high density of selenium vacancies and coordinatively unsaturated sites, which unlock a range of emergent functions absent in the crystalline precursor, including plasmon-free surface-enhanced Raman scattering with an enhancement factor exceeding 10$^\mathrm{6}$, a 50-fold increase in photocatalytic activity, and near-infrared photothermal conversion efficiency reaching 83$\%$. Our findings establish laser-induced amorphization as a powerful top-down approach for defect-engineered TMDCs and advances their practical usage in optics, catalysis, and nanomedicine.

Figures

Figures reproduced from arXiv: 2507.21918 by the authors.

Figure 1
Figure 1. (a) Photograph of PdSe2 crystal used as a target and its crystal structure, the unit cell is denoted as a dashed box; (b) Schematic view of PLAL; (c) From left to right: typical TEM image and SAED of PdSe2 flakes, and a high-resolution TEM photograph of a zoomed area of a single flake proving its crystalline structure; (d) From left to right: typical TEM image and SAED of PdSe2-x nanoparticles, and a zoomed TEM imag… view at source ↗
Figure 2
Figure 2. a),b) EDX of (a) flakes of PdSe2 and (b) nanoparticles of PdSe2 -x with TEM photographs in the insets; c) Photoluminescence spectra of PdSe2 flakes (grey region) and PdSe2-x nanoparticles (red, green and blue regions) acquired at excitation wavelengths of 350 nm, 380 nm and 410 nm; d),e) XPS characterization of bulk crystal PdSe2 for (d) Pd 3d and (e) Se 3d, with shirley baseline fitted spectra; f), g) XPS character… view at source ↗
Figure 3
Figure 3. Photothermal conversion efficiency (PCE) analysis of nanoparticle systems: (a) [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: (a) SERS spectra of CV acquired using PdSe [PITH_FULL_IMAGE:figures/full_fig_p011_4.png]
Figure 5
Figure 5. Figure 5: (a) UV–visible absorption spectra of PdSe [PITH_FULL_IMAGE:figures/full_fig_p015_5.png]

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Pith tools

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