{
  "abstract": "The development of advanced security materials with multimodal optical responses is of increasing relevance for anticounterfeiting technologies. In this study, we report the successful synthesis and comprehensive characterization of a multifunctional composite based on cellulose nanofibrils (CNFs) covalently functionalized with photochromic PSPA oligomers and cross-linked with upconversion nanoparticles (UCNPs). Covalent grafting of PSPA onto the CNF backbone was done via Cu0-mediated radical polymerization (SET-LRP) and confirmed by spectroscopic analyses, while microscopic and structural investigations verified the homogeneous incorporation of UCNPs within the nanofibril-based hybrid gel. The resulting material combines reversible photochromic behavior under ultraviolet irradiation with near-infrared (NIR)-to-visible upconversion luminescence, enabling dual-mode optical signaling. The nanocomposite exhibited distinct and reproducible color changes upon UV exposure and characteristic luminescent emission under NIR excitation, demonstrating its suitability for advanced anticounterfeiting applications. Furthermore, the formulation as a stable, printable gel underscores its practical processability and compatibility with scalable anticounterfeiting technologies. The integration of photochromic and upconversion optical functionalities within a renewable CNF-based platform provides a robust, versatile, and sustainable approach for secure labeling and product authentication.",
  "abstract_shown": true,
  "affiliations": [
    "Universität Hamburg , , Haidkrugsweg 1 , ,",
    "Deutsches Elektronen-Synchrotron DESY , Notkestr. 85 , ,",
    "Technical University of Munich , , James-Franck-Str. 1 , ,",
    "Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich , Lichtenbergstraße 1 , ,",
    "Lawrence Berkeley National Laboratory , , 6 Cyclotron Rd , , ,",
    "UPES , , , ,",
    "INRAE , , ,",
    "BIBS Facility, PROBE Infrastructure , ,",
    "Fraunhofer Center for Applied Nanotechnology CAN (A Research Division of Fraunhofer Institute for Applied Polymer Research-IAP, Potsdam) , Grindelallee 117 , ,",
    "KTH Royal Institute of Technology , , Teknikringen 56-58 , ,"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 12,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "J. Benedikt Mietner",
      "orcid": "0000-0001-5954-1774"
    },
    {
      "affs": [
        0
      ],
      "name": "Dhanya Girija Raveendran"
    },
    {
      "affs": [
        0
      ],
      "name": "Enguerrand Barba"
    },
    {
      "affs": [
        1,
        2,
        3
      ],
      "name": "Shouzheng Chen"
    },
    {
      "affs": [
        1,
        4
      ],
      "name": "Benedikt Sochor"
    },
    {
      "affs": [
        1,
        5
      ],
      "name": "Sarathlal Koyiloth Vayalil"
    },
    {
      "affs": [
        6,
        7
      ],
      "name": "Xavier Falourd"
    },
    {
      "affs": [
        8
      ],
      "name": "Rajesh Komban"
    },
    {
      "affs": [
        8
      ],
      "name": "Christoph Gimmler",
      "orcid": "0000-0001-5413-4432"
    },
    {
      "affs": [
        2
      ],
      "name": "Peter Müller-Buschbaum",
      "orcid": "0000-0002-9566-6088"
    },
    {
      "affs": [
        1,
        9
      ],
      "name": "Stephan V. Roth",
      "orcid": "0000-0002-6940-6012"
    },
    {
      "affs": [
        0
      ],
      "name": "Julien R. G. Navarro",
      "orcid": "0000-0001-8791-6190"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/90bej46p95d5w.bib",
  "cited_by": 0,
  "doi": "10.1021/acsomega.6c09372",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13718236/?tool=EBI",
  "id": "90bej46p95d5w",
  "issns": [
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  "landing_url": "https://pubs.acs.org/acsodf/article/11/42/65905/5451693/Multifunctional-CNF-Based-Composite-with",
  "language": "eng",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
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  "pdf_url": "https://pubs.acs.org/doi/pdf/10.1021/acsomega.6c09372",
  "pmcid": "PMC13718236",
  "pmid": "42960108",
  "published": "2026-10-15",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/90bej46p95d5w.ris",
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  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2502|Advanced Cellulose Research Studies",
      "subfield": "materials-polymers"
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  ],
  "title": "Multifunctional CNF-Based Composite with Photochromic and Upconversion Luminescence Properties for Advanced Anticounterfeiting Applications",
  "title_text": "Multifunctional CNF-Based Composite with Photochromic and Upconversion Luminescence Properties for Advanced Anticounterfeiting Applications",
  "type": "peer-reviewed",
  "updated_at": "2026-11-02T12:22:19Z",
  "url": "https://research.draconitic.com/paper/90bej46p95d5w",
  "venue": "ACS Omega",
  "versions": []
}