{
  "annotation_id": "c81d4e10-b8c6-4eab-a604-4f964ac0ed3b",
  "date_created": "2026-02-17T05:53:11.875000Z",
  "date_modified": "2026-02-17T05:53:11.875000Z",
  "file_hash": "b5db5d0621fef40f543fb9c01c8a021f9119b34cadee44cdd413d91cbc7de502",
  "private": false,
  "record": {
    "abstract": "Zinc sulphide (ZnS) is a non-toxic, wide-bandgap II-VI semiconductor well known for its optoelectronic properties and environmental friendliness. Conventional syntheses of ZnS quantum dots (QDs) often involve high temperatures or toxic reagents. This study presents a comparative investigation of hydrothermal and co-precipitation synthesis routes for ZnS QDs, emphasizing scalable, environmentally friendly production under mild conditions. Using polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG) as capping agents, we achieved precise control over particle size, optical properties, and particle size distribution. Room temperature co-precipitation produced monodisperse ZnS QDs with crystallite size as small as 2.03 nm, while hydrothermal synthesis at elevated temperature yielded larger crystals exceeding ~6 nm. X-ray diffraction confirmed zinc-blende crystal structure in all samples, with lattice parameter shifts and peak broadening reflecting nanoscale effects. UV-Visible spectroscopy revealed tuneable optical band gaps from 3.60 eV to 3.80 eV, corresponding to strong quantum confinement in smaller particles. FTIR and DLS analyses verified effective surface capping and particle size distribution, with PVP providing greater growth suppression and stability than PEG. These results demonstrate that ambient, polymer-assisted co precipitation enables low-toxicity, energy-efficient synthesis of high-quality ZnS QDs, offering a viable route toward sustainable and scalable nanoparticle production for optoelectronic and nanomaterial applications",
    "arxiv_id": "2601.07554",
    "authors": [
      "Rao Uzair Ahmad",
      "Nasir Javed"
    ],
    "categories": [
      "cond-mat.mtrl-sci"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Structure-Property Relationship in Zinc Sulphide Nanoparticles Synthesized by Hydrothermal and Co-precipitation Methods",
    "url": "https://arxiv.org/abs/2601.07554",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "779fcd0f-7709-45c6-91a3-284fd3862fe1",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}