Hydrogenation and defect formation control the strength and ductility of MoS\(_2\) nanosheets: Reactive molecular dynamics simulation (publisher proof PDF)

PDF variant

Elsevier proof PDF. Full curated protocols and quantitative stress–strain discussion are on 2018hasanian-extreme-mech-hydrogenation-defect (papers/Hasanian_ExtremeMechLett_2018.pdf).

Summary¶

The galley PDF papers/Hasanian_ExtremeMechLett_2018_galley.pdf corresponds to the Extreme Mechanics Letters article DOI 10.1016/j.eml.2018.05.008, “Hydrogenation and defect formation control the strength and ductility of MoS₂ nanosheets: Reactive molecular dynamics simulation.” The extract (normalized/extracts/2018hasanian-venue-paper_p1-2.txt) begins with Elsevier proofing notices (“changes made in the online proofing system… are not reflected in this PDF”) and an in-press citation line directing readers to the DOI above. The abstract reproduced there states that two-dimensional MoS₂ attracts attention for solar cells, photocatalysis, lithium-ion batteries, nanoelectronics, and electrocatalysis, and—like other 2D materials—can be tuned by chemical functionalization and defects. The authors state an objective to explore mechanical properties of hydrogen-functionalized single-layer MoS₂ and to analyze several defect types on mechanical response at room temperature using ReaxFF. They report that increasing hydrogen adatom or defect content significantly affects elastic modulus, tensile strength, stretchability, and failure behavior, and that the simulations provide guidance for designing nanodevices with hydrogenated and defective MoS₂. (A copyediting query visible in the online proof text asks whether a “better word” than “stretchability” is preferred, reflecting publisher workflow rather than physics content.)

Methods¶

Per the Elsevier proof PDF (pdf_path) and the version-of-record article (2018hasanian-extreme-mech-hydrogenation-defect), reactive MD uses LAMMPS with Mo–S–H ReaxFF (Ostadhossein et al.) on single-layer 2H-MoS\(_2\) supercells (e.g. 8280 atoms for the pristine case on the VOR page) with periodic boundary conditions in-plane as detailed on 2018hasanian-extreme-mech-hydrogenation-defect. Room-temperature (~300 K) NPT equilibration uses Nosé–Hoover thermostat and barostat damping values quoted on the VOR page, followed by uniaxial loading at 1×10⁹ s⁻¹ with 0.25 fs timestep and virial stress averaging intervals listed there. Monovacancy motifs follow the Zhou taxonomy. N/A — reproduce final figure labels from this proof file alone—use the non-galley PDF for pagination-sensitive citations.

Findings¶

Outcomes (abstract-level, proof PDF): hydrogen adatoms and several defect types materially change elastic modulus, tensile strength, stretchability, and failure behavior for single-layer MoS\(_2\) at room temperature in the authors’ ReaxFF workflow.

Mechanistic detail & numbers: N/A — stress–strain curves, S–S pairing after yield, and virial stress magnitudes are not extracted from this galley file in the corpus; read [[2018hasanian-extreme-mech-hydrogenation-defect]] for the curated quantitative discussion.

Comparisons / sensitivity: N/A — the proof excerpt does not restate experimental comparisons beyond motivating context in the full article.

Limitations / outlook: Proof PDFs can carry copyediting queries and non-final typography; corpus honesty: prefer the VOR PDF on the sibling wiki page for figure numbering and pagination.

Corpus / KB: this slug exists for manifest provenance of the galley bytes; duplicate of [[2018hasanian-extreme-mech-hydrogenation-defect]] for scientific interpretation.

Limitations¶

Proof PDFs can include editorial queries and differ cosmetically from the final XML. Prefer the non-galley PDF for stable figure numbering.

Relevance to group¶

Direct van Duin-group collaboration on TMD mechanics with ReaxFF.

Citations and evidence anchors¶

DOI: 10.1016/j.eml.2018.05.008.