Direct laser ablation of 2D material films for fabricating multi-functional flexible and transparent devices

Andres Castellanos-Gomez; Javier Martinez; Yigit Sozen; Yu Kyoung Ryu

REVIEW 2 major objections 7 minor 11 references

Direct laser ablation of 2D material films for fabricating multi-functional flexible and transparent devices

T0 review · 2 major / 7 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read A pulsed infrared laser can directly pattern 2D material films on flexible transparent plastic into working devices, without lithography or solvents, while preserving film crystallinity.

desk verdict A solid, useful process paper: low-cost fiber-laser patterning of roll-to-roll exfoliated 2D films works, and the main caveat is the under-supported 'no substrate damage' claim, which is fixable rather than fatal. read the letter →

arxiv 2506.03730 v1 pith:K5ZK7AW5 submitted 2025-06-04 physics.app-ph cond-mat.mtrl-sci

Yigit Sozen , Yu Kyoung Ryu , Javier Martinez , Andres Castellanos-Gomez This is my paper

classification physics.app-phcond-mat.mtrl-sci

keywords laserablation2Dmaterialsflexibleelectronicstransparentdevicesphotodetectorarraypolycarbonateroll-to-rollexfoliationvanderWaals

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 reports a direct-write method for patterning layered van der Waals films—graphite, MoS2, and WSe2—on polycarbonate and similar low-absorption substrates using a pulsed 1064-nm infrared fiber laser. The laser pulse is absorbed by the 2D film, which is ablated away, while the transparent substrate absorbs little of the light, so no photolithography, masks, or solvents are needed. The authors show that the remaining film keeps its crystallinity, with a Raman defect ratio mode of 0.08, and that the same setup can make a graphite strain gauge, an interdigitated micro-supercapacitor, and a 31-pixel WSe2/graphite photodetector array with uniform photocurrent response used to image an 'H' light pattern. If the method works as described, it offers a low-cost, scalable route to all-van der Waals flexible and semi-transparent electronic devices.

What carries the argument

The load-bearing mechanism is selective absorption: polycarbonate and similar substrates absorb little at 1064 nm, so a pulsed laser pulse is taken up by the 2D film, which heats and vaporizes, leaving the underlying polymer cool enough to stay intact. The patterning uses a low-cost laser engraving system run at 15% of its 20 W rated power and a scan speed of 50 mm/s, which the authors find removes the film cleanly without damaging the substrate. The complementary machinery is high-throughput roll-to-roll-like mechanical exfoliation with thermal-release tape, which produces homogeneous nanosheet films that can be transferred to PC, glass, or curved surfaces before patterning; the paper also shows that films can be patterned on the tape itself and then transferred onto substrates such as silicon that would otherwise absorb the laser light and overheat.

What would settle it

Image a cross-section of a laser-ablated line on polycarbonate with scanning electron microscopy and cyclically bend an ablated cantilever to failure next to a pristine one; visible microcracks, fewer cycles to failure, or localized changes in transmittance or fluorescence along the ablated edge would contradict the claim that the substrate is undamaged.

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Extended reading notes

Core claim

The paper's central claim is that direct laser ablation with a pulsed 1064-nm fiber laser can replace photolithography and wet etching for patterning nanosheet films of graphite, MoS2, and WSe2 on polycarbonate and other low-absorption substrates. It argues that the laser energy is absorbed by the film rather than the polymer, so the ablated edge is clean, the surrounding film keeps high crystallinity (Raman $I_D/I_G$ mode of 0.08 with a narrow distribution of peak positions), and the polycarbonate shows no detectable change by Raman spectroscopy. On this basis the authors build an all-van der Waals device set: a strain gauge, a micro-supercapacitor, and a 31-pixel WSe2/graphite photodetector array whose pixels show photocurrents of 27–76 nA, dark currents of $10^{-10}$–$10^{-9}$ A, signal-to-noise ratios of $10^2$–$10^3$, a power-law exponent of 0.68, and a low-power responsivity of 0.05 A/W, and they demonstrate the array as an image sensor by resolving an 'H' light pattern. The discovery, stated on the paper's own terms, is that a single, inexpensive, solvent-free laser step can pattern multiple layered materials into functional flexible and semi-transparent devices at a scale large enough for imaging.

Load-bearing premise

The claim that the substrate is unharmed rests on polycarbonate being a low-absorption substrate at 1064 nm, so the laser energy is absorbed by the 2D film rather than the polymer; the paper's support for this is Raman spectra of ablated and pristine PC that look identical, but Raman can miss microcracks, mechanical embrittlement, or subtle optical changes in the heat-affected zone.

Editorial extensions

If this is right

Complex device layouts, such as meander inductors, interdigitated electrodes, and pixel arrays, can be defined in seconds on a benchtop laser engraver, replacing mask-based lithography and wet etching for these films.
Conducting graphite and semiconducting MoS2 or WSe2 can be patterned in the same process, so all-van der Waals heterostructure devices can be built on one flexible transparent substrate.
The 31-pixel photodetector array works as an image sensor with uniform pixel response, indicating the patterning route can scale beyond a single device to multi-pixel flexible imagers.
Because both film production (roll-to-roll exfoliation) and patterning are solvent-free and fast, the process is positioned for low-waste, continuous manufacturing of flexible transparent electronics.
Patterning films on the transfer tape before lamination allows the same method to be used on substrates that strongly absorb infrared light, such as silicon, which otherwise overheat under the laser.

Reading between the lines

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

The selective-absorption criterion is not tied to polycarbonate, so a natural extension is to other transparent polymers and other layered semiconductors; the method should carry over wherever the substrate absorption at the laser wavelength is low.
The no-substrate-damage claim can be tested directly by mechanical fatigue or cross-sectional imaging of the ablated edge, because Raman spectra do not probe microcracks or embrittlement.
The uniformity of the photocurrent across pixels hints that pixel-to-pixel variation is set by flake-network coverage, not by the laser patterning, so improving film homogeneity would likely improve imaging resolution.
Combining this patterning step with printed or solution-cast 2D material inks could decouple the method from tape exfoliation and make it available to labs that do not run roll-to-roll processes.

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Editorial analysis

A structured set of objections, weighed in public.

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

Desk Editor's Note

read the letter

You asked about arXiv:2506.03730. My take: this is a genuine and useful process demonstration, with one claim that needs tightening before I would take it as fully established.

What is actually new is the specific combination: a cheap 1064 nm pulsed fiber-laser engraver directly patterning roll-to-roll exfoliated graphite, MoS2, and WSe2 films on polycarbonate and other low-absorption substrates, no lithography and no solvents. The same tool patterns conductors and semiconductors, which is what lets them build all-van der Waals devices. The 31-pixel WSe2/graphite photodetector array with reasonably uniform photocurrent and the "H"-pattern imaging demo are a legitimate scalability statement, not just a single-device trick. The strain gauge shows reversible response with only 1.4% drift over an hour of cycling, which is real evidence that the film survives mechanical deformation. They also honestly report the micro-supercapacitor's small areal capacitance rather than overselling it.

The electrical characterization is solid: TLM gives sheet resistance dropping to 106 Ohm/sq, contact resistances in the single-digit ohm range, and the extracted resistivity is consistent with other graphite nanosheet films. Raman mapping with ID/IG mode at 0.08 and narrow peak-position distributions supports the claim that the laser does not destroy the film crystallinity away from the edge. The citation pattern looks fine; references to their own earlier laser-trimming and mechanical-exfoliation work are appropriate and not inflationary.

The soft spots are real but modest. The "no observable damage to the underlying substrate" claim rests mainly on Raman spectra of ablated versus pristine polycarbonate, plus optical microscopy. Raman can miss subsurface microcracks, chain scission, embrittlement, or local optical changes, and there is no control where bare PC is exposed to the same laser settings without a film. That is a fair referee question, and the authors should add a mechanical or optical check (bend-to-failure, transmittance, or cross-section) before the claim appears in the abstract. It is not fatal: the working strain gauge and photodetector array on PC are themselves evidence against gross substrate failure, and the method's value does not collapse if the heat-affected zone is slightly larger than claimed.

The photoresponsivity normalization uses a coverage factor c = 0.9 chosen by inspection. That is a genuine free parameter, but the comparison to liquid-phase-exfoliated devices (0.001-28 mA/W) is robust to reasonable changes in c, so it does not undermine the conclusion.

Who should read it: anyone working on flexible 2D electronics or rapid prototyping of vdW devices. It is a methods paper, not a physics breakthrough, but it ships multiple working devices and a clear process recipe.

If this crossed my desk, I would send it to peer review. It deserves a serious referee; I would ask for one targeted addition on substrate integrity and a bit more caution in the abstract's wording, then accept.

Referee Report

2 major / 7 minor

Summary. The manuscript reports a direct-write patterning method for graphite, MoS2, and WSe2 films using a pulsed 1064 nm fiber laser on polycarbonate and other substrates. The authors combine roll-to-roll-like mechanical exfoliation with laser ablation to fabricate strain gauges, micro-supercapacitors, and a 31-pixel WSe2/graphite photodetector array used as an image sensor. They claim the process preserves film crystallinity, does not damage the substrate, and is faster and more environmentally friendly than photolithography. The central evidence includes Raman mapping (ID/IG mode 0.08), TLM sheet resistance down to 106 Ω/□, cyclic strain gauge response with ~1.4% drift, and a photocurrent response that is comparable across array pixels.

Significance. If the substrate-integrity and TMD-crystallinity claims hold, the method is a valuable low-cost, lithography-free route to flexible all-van der Waals devices. The paper includes several concrete strengths: quantitative Raman mapping, TLM analysis, power-law photocurrent fitting, a 31-pixel array demonstration, and a fair comparison with liquid-phase-exfoliated photodetectors. The fabrication parameters are described in enough detail to be reproduced. The main uncertainties are experimental under-support of two load-bearing claims, not internal circularity or an unfixable derivation error.

major comments (2)

[Structural and electronic characterization / Raman characterization (Fig. S4b)] The claim of 'no observable damage to the underlying substrate' (Abstract and Results) is supported only by Raman spectra of ablated versus pristine PC and by optical microscopy. Raman is insensitive to several degradation modes that matter for flexible transparent devices: subsurface microcracks, molecular-weight reduction/chain scission, embrittlement, and local changes in refractive index or optical absorption. The manuscript does not report a control experiment exposing bare PC to the same laser settings (15% power, 50 mm/s), nor does it report optical transmittance or mechanical flexibility measurements after ablation. Because the transparent-flexible value proposition depends on substrate integrity, I request either direct measurements of the ablated regions (e.g., UV-vis transmittance, SEM/AFM of the ablation line, bending-to-failure tests) or a softening of the claim to 'no detectable Raman changes in the PC.'
[Raman characterization of the laser ablation processed materials (Figs. 2, S4)] The crystallinity claim is demonstrated only for graphite. Raman mapping and ID/IG analysis are performed on the graphite film; no post-ablation Raman spectra are shown for MoS2 or WSe2, despite the abstract stating that 'laser-processed films maintain their crystallinity' for all materials patterned. Since the versatility of the method across TMDs is a central advance, either provide Raman (or equivalent) data for MoS2 and WSe2 after ablation, or restrict the crystallinity claim to graphite and state that TMD functionality is inferred from device operation.

minor comments (7)

[Figure 6d] The term 'uniform photocurrent' is used although pixel values span 27–76 nA; please report the mean and standard deviation and define the uniformity criterion used.
[Equation (2) and photodetector responsivity] The coverage factor c=0.9 is described as 'obtained' but no estimation procedure or uncertainty is given; please state how c was determined and how the reported responsivity would change for a plausible range of c.
[Materials and Methods, Laser Ablation] The text contains the typo 'SeaCAD sofware'; it should be 'SeaCAD software'.
[References] Reference 41 duplicates Reference 35 (the same Pimenta et al. paper); please consolidate to avoid confusion.
[Figure 2h and histograms] The histograms report the mode of lognormal fits; because the distributions are right-skewed, the mean ID/IG will be larger than 0.08, so please also report the mean or median for a complete picture.
[Photodetector array description] The sentence 'causing the formation of two sets of arrays which can be readout as 4 × 4 and 5 × 3' is awkward and should be rephrased to clarify the readout geometry.
[Strain gauge stability (Figure 5d)] The 1.4% drift is attributed to temperature or humidity changes without supporting measurements; please either measure these environmental conditions or label the explanation as a hypothesis.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the paper is an experimental characterization study with no derivation that reduces to its own inputs.

full rationale

The manuscript reports an empirical fabrication and characterization study: pulsed 1064-nm laser ablation patterns graphite, MoS2, and WSe2 films on polycarbonate and other substrates, and the supporting evidence consists of optical, Raman, electrical, electrochemical, and optoelectronic measurements. There is no claimed first-principles derivation or prediction whose output is equivalent by construction to an input. The Raman ID/IG ratio, sheet resistance extracted by TLM linear fits, areal capacitance from GCD curves, photocurrent power-law exponent, and photoresponsivity are all fitted or computed from measured data and used descriptively, not presented as predictions of a model derived from the method itself. The photoresponsivity calculation uses an areal coverage factor c = 0.9 chosen by inspection of the channel, which scales the reported responsivity values but does not force the comparison against liquid-phase-exfoliated devices; that comparison is an external benchmark and remains robust to reasonable choices of c. The roll-to-roll exfoliation method is cited to prior work by the authors (Ref. 30), but the present paper independently demonstrates the resulting film quality through its own microscopy, Raman, and electrical data, so the citation is not load-bearing for the central patterning claim. Similarly, the XPS cleanliness statement cites Ref. 32, but this is a supporting characterization detail rather than a premise on which the main result logically depends. No equation in the paper reduces to its own input, no fitted parameter is renamed as a prediction, and no uniqueness theorem or self-citation chain is invoked to forbid alternative interpretations. The only notable weakness is that substrate-integrity evidence relies mainly on Raman spectra, which is a completeness or correctness-risk concern, not a circularity concern.

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

No new physical entities are introduced. The central claims rest on process parameters and interpretive assumptions about characterization, not on new forces, particles, or conserved quantities.

free parameters (4)

Coverage factor c = 0.9
Estimated from optical micrographs to define Aeffective = c * total channel area in the photoresponsivity equation; directly scales reported responsivity values.
Laser power setting = 15% of 20 W (3 W)
Chosen to ablate films without damaging substrate; central process parameter.
Scan speed = 50 mm/s
Sets ablation exposure time; combined with power to control patterning quality.
Number of film transfers = 5 (graphite), 5 (WSe2)
Chosen to reach percolating conductive networks; sheet resistance decreases with transfer count.

assumptions (4)

domain assumption Polycarbonate is transparent and low-absorbing at 1064 nm, so the laser pulse heats the 2D film but not the substrate.
Underlies the no-substrate-damage claim; tested only via Raman on PC (Figure S4).
domain assumption Raman ID/IG ratio is a valid quantitative proxy for defect density in the percolative graphite flake network.
Used to conclude crystallinity is preserved (Figure 2); assumes standard graphite Raman assignments apply to this film geometry.
domain assumption The thermal release transfer leaves no residue that would alter contact or channel properties.
Cites prior XPS work (ref 32) for cleanliness; if residues remained, TLM contact resistances and photodetector dark currents would change.
domain assumption The photoconductivity mechanism obeys a single power law Ipc ~ P^α, with α=0.68, interpreted as photogating.
Used to claim sub-linear response and photogating effect; fitted to data without stated uncertainty.

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Cite this review

Pith. "Pith review of Direct laser ablation of 2D material films for fabricating multi-functional flexible and transparent devices." pith.science (2026). https://pith.science/paper/K5ZK7AW5

@misc{pith2026250603730,
  author       = {Pith},
  title        = {Pith review of: Direct laser ablation of 2D material films for fabricating multi-functional flexible and transparent devices},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/K5ZK7AW5}},
  note         = {Machine review of arXiv:2506.03730}
}

read the original abstract

We present a scalable method for direct patterning of graphite and transition metal dichalcogenide (TMD) films on polycarbonate (PC) and other transparent substrates using fiber laser ablation. This process facilitates the fabrication of various functional devices, including strain gauges, supercapacitors, and photodetector arrays, without the need for photolithography or solvents, thereby simplifying device production and enhancing environmental sustainability. Utilizing roll-to-roll mechanical exfoliation, homogeneous nanosheet films are created and then patterned with a laser engraving system. Electrical and optical characterization confirms that the laser-processed films maintain their crystallinity, with no observable damage to the underlying substrate. We demonstrate the scalability of this approach by constructing a WSe2/graphite photodetector array on PC, which exhibits high sensitivity, low noise, and uniform photocurrent response across its active channels. As a proof-of-concept, this array is used as an image sensor to capture light patterns, showcasing its potential for flexible and semi-transparent imaging applications. These findings open up new avenues for incorporating all-van der Waals devices into wearable electronics, optoelectronics, and imaging technologies.

Figures

Figures reproduced from arXiv: 2506.03730 by the authors.

**Figure 1.** Laser ablation patterning of graphite, MoS2, and WSe2 films on various substrates. (a) Sequential images of the laser ablation process on a roll-to-roll exfoliated graphite film deposited on a PC substrate, with times indicating the elapsed duration from the start of the ablation. (b) Laser-patterned graphite structures on a glass substrate, including a meander-line inductor (top), resistors with different geometrie… view at source ↗

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Reference graph

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.

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work page doi:10.1021/acsnano.2c09501 2023

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J.; Ogilvie, S

(47) Large, M. J.; Ogilvie, S. P.; Amorim Graf, A.; Lynch, P. J.; O’Mara, M. A.; Waters, T.; Jurewicz, I.; Salvage, J. P.; Dalton, A. B. Large-Scale Surfactant Exfoliation of Graphene and Conductivity-Optimized Graphite Enabling Wireless Connectivity. Adv. Mater. Technol. 2020, 5 (7), 2000284. https://doi.org/10.1002/admt.202000284. (48) Hyun, W. J.; Seco...

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(45) Nakamura, S.; Miyafuji, D.; Fujii, T.; Matsui, T.; Fukuyama, H

https://doi.org/10.1038/ncomms2022. (45) Nakamura, S.; Miyafuji, D.; Fujii, T.; Matsui, T.; Fukuyama, H. Low Temperature Transport Properties of Pyrolytic Graphite Sheet. Cryogenics 2017, 86, 118–122. https://doi.org/10.1016/j.cryogenics.2017.08.004. (46) Gabbett, C.; Kelly, A. G.; Coleman, E.; Doolan, L.; Carey, T.; Synnatschke, K.; Liu, S.; Dawson, A.; ...

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30 (55) Pan, K.; Fan, Y.; Leng, T.; Li, J.; Xin, Z.; Zhang, J.; Hao, L.; Gallop, J.; Novoselov, K

https://doi.org/10.1038/s41467-017-01210-2. 30 (55) Pan, K.; Fan, Y.; Leng, T.; Li, J.; Xin, Z.; Zhang, J.; Hao, L.; Gallop, J.; Novoselov, K. S.; Hu, Z. Sustainable Production of Highly Conductive Multilayer Graphene Ink for Wireless Connectivi ty and IoT Applications. Nat. Commun. 2018, 9 (1),

work page doi:10.1038/s41467-017-01210-2

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(61) Hempel, M.; Nezich, D.; Kong, J.; Hofmann, M

https://doi.org/10.1007/978-1-4757-3058-6. (61) Hempel, M.; Nezich, D.; Kong, J.; Hofmann, M. A Novel Class of Strain Gauges Based on Layered Percolative Films of 2D Materials. Nano Lett. 2012, 12 (11), 5714–5718. https://doi.org/10.1021/nl302959a. (62) McManus, D.; Vranic, S.; Withers, F.; Sanchez-Romaguera, V.; Macucci, M.; Yang, H.; Sorrentino, R.; Par...

work page doi:10.1007/978-1-4757-3058-6 2012