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In this study, luminescent lanthanide\u2010based nanocomposite hydrogels featuring injectable and self\u2010healing properties are developed for VOC sensing. Europium\u2010containing laponite (Eu\n                    <jats:sup>3+<\/jats:sup>\n                    @Lap) and 2\u2010thiophenyltrifluoroacetone (TTA)\u2010modified Eu\n                    <jats:sup>3+<\/jats:sup>\n                    @Lap (Eu\n                    <jats:sup>3+<\/jats:sup>\n                    (TTA)@Lap) are incorporated into a dynamic cross\u2010linked hydrogel network composed of polyethyleneimine\u2010modified gelatin and polydextran aldehyde (PG\/PDA), resulting in PG\/PDA\/Eu\n                    <jats:sup>3+<\/jats:sup>\n                    @Lap and PG\/PDA\/Eu\n                    <jats:sup>3+<\/jats:sup>\n                    (TTA)@Lap hydrogels, respectively. The luminescent properties, microstructures, and mechanical characteristics of these two nanocomposite hydrogels are systematically investigated. The interactions of VOCs with the laponite luminophores alter the luminescence of the gels and produce unique response patterns for each VOC. PG\/PDA\/Eu\n                    <jats:sup>3+<\/jats:sup>\n                    (TTA)@Lap lyophilized hydrogel presented a superior sensing capability compared to PG\/PDA\/Eu\n                    <jats:sup>3+<\/jats:sup>\n                    @Lap lyophilized hydrogel in distinguishing formaldehyde from various VOCs, with the calculated detection limit of 39 ppb. This work highlights the importance of the effective antenna effect between organic ligands and lanthanide ions in improving the sensing capability of the luminescent nanocomposite hydrogels and demonstrates the promise of the dynamic cross\u2010linked PG\/PDA\/Eu\n                    <jats:sup>3+<\/jats:sup>\n                    (TTA)@Lap hydrogel as an innovative platform in environmental VOC monitoring.\n                  <\/jats:p>","DOI":"10.1002\/smll.202501574","type":"journal-article","created":{"date-parts":[[2025,5,19]],"date-time":"2025-05-19T03:56:17Z","timestamp":1747626977000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Injectable and Self\u2010Healable Luminescent Europium\u2010Containing Gelatin\/Polydextran\/Laponite Nanocomposite Hydrogels for Distinguishing Formaldehyde in Volatile Organic Compounds"],"prefix":"10.1002","volume":"21","author":[{"given":"Pin\u2010Han","family":"Zeng","sequence":"first","affiliation":[{"name":"Institute of Polymer Science and Engineering National Taiwan University  Taipei 10617 Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guo\u2010Zen","family":"Song","sequence":"additional","affiliation":[{"name":"Institute of Polymer Science and Engineering National Taiwan University  Taipei 10617 Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4576-8665","authenticated-orcid":false,"given":"Yi\u2010Cheun","family":"Yeh","sequence":"additional","affiliation":[{"name":"Institute of Polymer Science and Engineering National Taiwan University  Taipei 10617 Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,5,19]]},"reference":[{"key":"e_1_2_9_1_1","first-page":"215","volume":"1","author":"Yadav J.","year":"2023","journal-title":"Opt. 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