{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T15:54:14Z","timestamp":1791647654753,"version":"4.3.4"},"reference-count":40,"publisher":"Wiley","issue":"42","license":[{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2022YFA1207600"],"award-info":[{"award-number":["2022YFA1207600"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22274157"],"award-info":[{"award-number":["22274157"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2026,10,12]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Ultrasensitive detection of nonpolar toxic VOCs like toluene remains a great challenge for environmental monitoring. This work presents a rationally designed SERS platform based on metallized covalent organic frameworks (M\u2010COFs, M = Fe, Ni, Cu) obtained by a mild metal\u2010modulation strategy that enables metal\u2011tunable COF crystallinity and porosity. M\u2010COFs were one\u2010pot synthesized from PyTA and PDA under 70\u00a0\u00b0C and atmospheric pressure. Spectroscopic characterizations confirm atomic dispersion of M\n                    <jats:sup>2+<\/jats:sup>\n                    with four\u2010coordinate M\u2500N\/O bonding in the frameworks. Particularly, Fe\u2500COF exhibits superior crystallinity and an enhanced BET surface area of 2078\u00a0m\n                    <jats:sup>2<\/jats:sup>\n                    g\n                    <jats:sup>\u22121<\/jats:sup>\n                    with a pore size of 1.87\u00a0nm, whereas Ni\u2011 and Cu\u2500COF show reduced structural order. The Au\/Fe\u2500COF SERS platform achieves a toluene detection limit of 0.1 ppb with an enhancement factor of 1.5\u00a0\u00d7\u00a010\n                    <jats:sup>6<\/jats:sup>\n                    , outperforming Ni\u2500COF (0.5 ppb), Cu\u2500COF (1\u00a0ppm), and metal\u2010free COF (10 ppb). DFT calculations verify Fe\u2500COF \u2019s ultrahigh toluene adsorption affinity with an adsorption energy of \u221234.17\u00a0kcal mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    and its higher crystallinity compared to its counterparts. This platform also shows excellent anti\u2010interference and enables specific toluene detection in complex gas mixtures. The M\u2010COF\u2010based SERS system offers a practical solution for ultra\u2010trace nonpolar VOC monitoring.\n                  <\/jats:p>","DOI":"10.1002\/anie.8532105","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T12:04:28Z","timestamp":1787227468000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Metal\u2010COF\u2010Based SERS Platform for PPb\u2010Level Toluene Sensing With Tailored Metal Selectivity"],"prefix":"10.1002","volume":"65","author":[{"given":"Mingkai","family":"Ren","sequence":"first","affiliation":[{"name":"School of Science China University of Geosciences (Beijing) Beijing China"},{"name":"CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences  Beijing 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