{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T18:40:15Z","timestamp":1778006415162,"version":"3.51.4"},"reference-count":23,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2025,6,5]],"date-time":"2025-06-05T00:00:00Z","timestamp":1749081600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Shanghai Foundation for Development of Science and Technology, China","award":["22dz1203800"],"award-info":[{"award-number":["22dz1203800"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This study utilized tetramethylammonium hydroxide (TMAH) as a substitute for traditional catalysts and successfully incorporated platinum octaethylporphyrin (PtOEP) into SiO2 nanoparticles (PtOEP@SiO2) via the St\u00f6ber method. Methyl silicone resin was employed as the matrix material, and a drop-coating technique was applied to fabricate thin films of PtOEP@SiO2 particles for dissolved oxygen (DO) sensing in seawater. By optimizing the concentrations of TMAH and PtOEP, a highly sensitive oxygen-sensing film with a quenching ratio (I0\/I100) of 28 was ultimately developed, with a wide linear detection range (0~20 mg\/L, R2 = 0.994). Stability tests revealed no significant performance degradation during five oxygen\u2013nitrogen cycle tests. After 30 days of immersion in East China Sea seawater, the quenching ratio decreased by only 6%, confirming its long-term stability and excellent resistance to ion interference. This research provides a novel strategy for developing highly reliable in situ marine DO sensors.<\/jats:p>","DOI":"10.3390\/s25113559","type":"journal-article","created":{"date-parts":[[2025,6,5]],"date-time":"2025-06-05T05:49:22Z","timestamp":1749102562000},"page":"3559","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Highly Sensitive Dissolved Oxygen Sensor with High Stability in Seawater Based on Silica-Encapsulated Platinum(II) Porphyrin"],"prefix":"10.3390","volume":"25","author":[{"given":"Hang","family":"Lv","sequence":"first","affiliation":[{"name":"State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China"},{"name":"Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2260-3772","authenticated-orcid":false,"given":"Siyuan","family":"Cheng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Song","family":"Hu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0728-5614","authenticated-orcid":false,"given":"Guohong","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1038\/nature13068","article-title":"The rise of oxygen in Earth\u2019s early ocean and atmosphere","volume":"506","author":"Lyons","year":"2014","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1444","DOI":"10.2166\/wst.2022.281","article-title":"Dissolved oxygen control strategies for water treatment: A review","volume":"86","author":"Li","year":"2022","journal-title":"Water Sci. 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