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http://hdl.handle.net/10397/95692
Title: | Tunable piezoresistivity of low percolation threshold micro-nickel wires/PDMS conductive composite regulated by magnetic field | Authors: | Niu, S Wang, S Yan, Q Han, Z Lou, X Li, Q Wang, Z Leung, CW Qu, S |
Issue Date: | 14-May-2021 | Source: | Journal of materials chemistry C, 14 May 021, v. 9, no. 18, p. 5908-5919 | Abstract: | High-performance flexible pressure sensors with tunable piezoresistivity are proposed with percolative composites as a single sensing layer using micro-nickel (μNi) wires as the conductive filler and polydimethylsiloxane (PDMS) as the matrix. The μNi wires were dispersed in PDMS and cured in a magnetic field of 17 mT to align the μNi wires along the direction of the magnetic field. An ultra-low percolation threshold (0.31 vol%) has been achieved, which is more than an order of magnitude lower than the 4.79 vol% of the control sample without a magnetic field. The pressure sensor with microhump structures based on Ni@PDMS composites with a volume fraction of 0.6 vol% molded by sandpaper exhibited ultrahigh averaged sensitivity (8706 kPa−1), a wide sensing range of 1 kPa to 120 kPa and a fast response time of ∼22 ms. The sensor was used to monitor different frequencies and flow rates of water flowing in a pump-driven system that mimics the pulsatile behavior of the coronary artery, and judge whether the graft vessel is blocked or not, showing high potential for application in clinical diagnosis. | Publisher: | Royal Society of Chemistry | Journal: | Journal of materials chemistry C | ISSN: | 2050-7526 | EISSN: | 2050-7534 | DOI: | 10.1039/d1tc00530h | Rights: | This journal is © The Royal Society of Chemistry 2021 The following publication Niu, S., Wang, S., Yan, Q., Han, Z., Lou, X., Li, Q., ... & Qu, S. (2021). Tunable piezoresistivity of low percolation threshold micro-nickel wires/PDMS conductive composite regulated by magnetic field. Journal of Materials Chemistry C, 9(18), 5908-5919 is available at https://doi.org/10.1039/d1tc00530h |
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Leung_Tunable_Piezoresistivity_Low.pdf | Pre-Published version | 1.8 MB | Adobe PDF | View/Open |
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