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Herein, a transmittance\u2010shifting triboelectric nanogenerator (TS\u2010TENG) providing complementary droplet\u2010induced electrical sensing and water\u2013responsive optical modulation is proposed. The device consists of porous polydimethylsiloxane (PDMS) on indium tin oxide glass, enabling reversible transparency regulation through water infiltration and release within the porous structure. The optical transmittance decreases from 84.80% in the transparent state to 46.67% after water infiltration, producing a hazy appearance. In parallel, droplet impacts are converted into electrical signals for real\u2010time sensing, and stable output is maintained under continuous operation after optimization of the droplet\u2010impact conditions. The transient electrical response enables rapid detection of droplet impacts, whereas the reversible transmittance change indicates sustained water infiltration within the porous layer. These mechanistically distinct but complementary responses are realized within a single porous PDMS\u2010based device without requiring a separate optically active material, providing a dual\u2010response platform for water\u2010responsive sensing and optical wet\u2010state indication.<\/jats:p>","DOI":"10.1002\/smll.76226","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T13:27:25Z","timestamp":1791984445000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Water\u2013Responsive Porous Polydimethylsiloxane Triboelectric Nanogenerator With Complementary Optical Modulation and Droplet Sensing"],"prefix":"10.1002","author":[{"given":"Quanyu","family":"He","sequence":"first","affiliation":[{"name":"Department of Semiconductor Engineering Kyung Hee University  Yongin Republic of 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