Journal Article

PUBDB-2026-03155

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Multifunctional CNF-Based Composite with Photochromic and Upconversion Luminescence Properties for Advanced Anticounterfeiting Applications

Mietner, J. B. (Corresponding author) ; Raveendran, D. G.Extern* ; Barba, E.Extern* ; Chen, S. ; Sochor, B.Extern*DESY* ; Koyiloth Vayalil, S.DESY* ; Falourd, X. ; Komban, R. ; Gimmler, C. ; Müller-Buschbaum, P.Extern* ; Roth, S. V.XFEL.EU*DESY* ; Navarro, J. R. G. (Corresponding author)Extern*

2026
ACS Publications Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsomega.6c09372  doi:10.3204/PUBDB-2026-03155

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 inves- tigations 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.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PET-D)
2. Sustainable Materials (FS-SMA)
3. DOOR-User (DOOR)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20240168 (I-20240168) (I-20240168)
4. SINE2020 - World class Science and Innovation with Neutrons in Europe 2020 – SINE2020 (654000) (654000)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; Fees ; IF < 5 ; JCR ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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