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However, it is challenging to accurately monitor the deformation of human body joints and organs with curved surfaces (e.g., knees, throats, finger joints) by only taking advantage of material thickness and elasticity of conventional\u00a02D film strain sensors. Herein, a simple strategy is developed to fabricate conformal elastomeric thin film sensors with periodic 3D microstructure inspired by the ridges and valleys of human skin for accurate signal acquisition. Specifically, an 8\u2010micrometer\u2010thick elastic film strain sensor with 3D microstructure is fabricated via thermoforming followed by in situ chemical growth of silver nanoparticles. The 3D film strain sensors exhibit excellent signal linearity (R\n                    <jats:sup>2<\/jats:sup>\n                    = 0.99) and relatively high sensitivity (gauge factor = 14) over a relatively wide strain range (\u224843%), with an ultra\u2010low strain detection limit of 0.025%, enabling potential applications in human healthcare monitoring and air leakage detection. Thus, this study unveils a simple methodology to process microstructure\u2010enabled conformable 3D film strain sensors, which show good conformability and multiple mechanical sensing functions for advancing the development of next\u2010generation flexible strain sensors.\n                  <\/jats:p>","DOI":"10.1002\/smll.202500444","type":"journal-article","created":{"date-parts":[[2025,4,14]],"date-time":"2025-04-14T03:06:46Z","timestamp":1744600006000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["An 8\u2010Micrometer\u2010Thick Film Strain Sensor with Conformal 3D Microstructure for Accurate Detection of Body Motion and Air Leakage"],"prefix":"10.1002","volume":"21","author":[{"given":"Qi","family":"Jing","sequence":"first","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Gong","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"He\u2010Qing","family":"Shao","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu\u2010Jie","family":"Wu","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia\u2010Xing","family":"Guo","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai","family":"Ke","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"},{"name":"Key Laboratory of Basalt Fiber and Composites of Sichuan Province  Dazhou 635756 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Gong","sequence":"additional","affiliation":[{"name":"Ningbo Institute of Northwestern Polytechnical University  Ningbo 315103 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Cao","sequence":"additional","affiliation":[{"name":"Ningbo Institute of Northwestern Polytechnical University  Ningbo 315103 China"},{"name":"School of Marine Science and Technology Northwestern Polytechnical University  Xi'an 710072 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zheng\u2010Ying","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0198-1632","authenticated-orcid":false,"given":"Wei","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Polymer Science and Engineering Sichuan University  Chengdu 610065 China"},{"name":"Key Laboratory of Basalt Fiber and Composites of Sichuan Province  Dazhou 635756 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4,14]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201904765"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202103734"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.3c03829"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202104686"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202100542"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202306655"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202008936"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.abj9220"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-019-14214-x"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.201602790"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bios.2022.114298"},{"key":"e_1_2_8_12_1","volume":"37","author":"Xue J.","year":"2025","journal-title":"Adv. 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