{
  "abstract": "Establishing how nanoscale morphology gives rise to plasmonic chirality requires understanding both its development during nanoparticle growth and its response to subsequent structural modification. Here, we investigate these complementary processes within a single nanoparticle platform through cysteine-directed Au growth followed by Ag overgrowth. Initially achiral Au bipyramids evolve into irregular, faceted nanoparticles displaying strong bisignate circular dichroism (CD), with L- and D-cysteine producing approximately mirror-related responses. Varying the relative proportions of the cysteine enantiomers systematically controls the sign and magnitude of the CD response, with near cancellation for the racemic mixture. Time-resolved measurements reveal that the positive and negative CD bands develop with comparable sigmoidal Avrami-type kinetics, quantitatively capturing the emergence of plasmonic chirality during growth. Once chirality is established, subsequent Ag deposition without additional cysteine progressively blue-shifts the plasmonic response and attenuates the CD of both enantiomeric nanoparticles without sign reversal. This attenuation accompanies the transformation of the irregular, faceted Au exterior into a smoother and more rounded Ag-rich outer morphology. Together, these observations connect the emergence and postsynthetic attenuation of plasmonic chirality and highlight the importance of the asymmetric nanoparticle exterior in sustaining morphology-encoded chiroptical activity.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Chemistry",
    "Birla Institute of Technology and Science Pilani, Pilani Campus"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Shubhangi Sharma"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Susmita Pradhan"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Arun Pratap Singh"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Satyajit Patra"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/87w5zys94q0j5.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15009103/v1",
  "fulltext_url": null,
  "id": "87w5zys94q0j5",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009103/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2504|Gold and Silver Nanoparticles Synthesis and Applications"
    ]
  ],
  "openalex": "W7213867328",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15009103/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-20",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/87w5zys94q0j5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:19Z",
      "native_id": "10.26434/chemrxiv.15009103",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009103/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2504|Gold and Silver Nanoparticles Synthesis and Applications",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Growth and Postsynthetic Modulation of Morphology-Encoded Plasmonic Chirality",
  "title_text": "Growth and Postsynthetic Modulation of Morphology-Encoded Plasmonic Chirality",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:19Z",
  "url": "https://research.draconitic.com/paper/87w5zys94q0j5",
  "venue": "ChemRxiv",
  "versions": []
}