{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T20:34:40Z","timestamp":1778790880616,"version":"3.51.4"},"reference-count":55,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2020,8,13]],"date-time":"2020-08-13T00:00:00Z","timestamp":1597276800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Taishan Scholar Foundation of Shandong Province","award":["NO.tsqn201812087"],"award-info":[{"award-number":["NO.tsqn201812087"]}]},{"name":"National Natural Science Fund of China","award":["NO. 61901239"],"award-info":[{"award-number":["NO. 61901239"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The CNT-PDMS composite has been widely adopted in flexible devices due to its high elasticity, piezoresistivity, and biocompatibility. In a wide range of applications, CNT-PDMS composite sensors were used for resistive strain measurement. Accordingly, the percolation threshold 2%~4% of the CNT weight ratio in the CNT-PDMS composite was commonly selected, which is expected to achieve the optimized piezoresistive sensitivity. However, the linear range around the percolation threshold weight ratio (2%~4%) limits its application in a stable output of large strain (&gt;20%). Therefore, comprehensive understanding of the electromechanical, mechanical, and electrical properties for the CNT-PDMS composite with different CNT weight ratios was expected. In this paper, a systematic study was conducted on the piezoresistivity, Young\u2019s modulus, conductivity, impedance, and the cross-section morphology of different CNT weight ratios (1 to 10 wt%) of the CNT-PDMS composite material. It was experimentally observed that the piezo-resistive sensitivity of CNT-PDMS negatively correlated with the increase in the CNT weight ratio. However, the electrical conductivity, Young\u2019s modulus, tensile strength, and the linear range of piezoresistive response of the CNT-PDMS composite positively correlated with the increase in CNT weight ratio. Furthermore, the mechanism of these phenomena was analyzed through the cross-section morphology of the CNT-PDMS composite material by using SEM imaging. From this analysis, a guideline was proposed for large strain (40%) measurement applications (e.g., motion monitoring of the human body of the finger, arm, foot, etc.), the CNT weight ratio 8 wt% was suggested to achieve the best piezoresistive sensitivity in the linear range.<\/jats:p>","DOI":"10.3390\/s20164523","type":"journal-article","created":{"date-parts":[[2020,8,13]],"date-time":"2020-08-13T02:58:02Z","timestamp":1597287482000},"page":"4523","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":86,"title":["Optimized CNT-PDMS Flexible Composite for Attachable Health-Care Device"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2458-3322","authenticated-orcid":false,"given":"Jian","family":"Du","sequence":"first","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Li","family":"Wang","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yanbin","family":"Shi","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Feng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shiheng","family":"Hu","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2025-5233","authenticated-orcid":false,"given":"Pengbo","family":"Liu","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anqing","family":"Li","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Chen","sequence":"additional","affiliation":[{"name":"Advanced Micro and Nanoinstruments Center (AMNC), School of Mechanical &amp; Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,8,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.nanoen.2017.05.024","article-title":"Ultrasensitive and ultraflexible e-skins with dual functionalities for wearable electronics","volume":"38","author":"Lou","year":"2017","journal-title":"Nano Energy"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1313","DOI":"10.1016\/j.jacc.2005.11.063","article-title":"Measurement of Strain and Strain Rate by Echocardiography","volume":"47","author":"Marwick","year":"2006","journal-title":"J. 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