Frictionless multiphasic interface for near-ideal aero-elastic pressure sensing

Wen Cheng, Xinyu Wang, Ze Xiong, Jun Liu, Zhuangjian Liu, Yunxia Jin, Haicheng Yao, Tak Sing Wong, John S. Ho, Benjamin C.K. Tee

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Conventional pressure sensors rely on solid sensing elements. Instead, inspired by the air entrapment phenomenon on the surfaces of submerged lotus leaves, we designed a pressure sensor that uses the solid–liquid–liquid–gas multiphasic interfaces and the trapped elastic air layer to modulate capacitance changes with pressure at the interfaces. By creating an ultraslippery interface and structuring the electrodes at the nanoscale and microscale, we achieve near-friction-free contact line motion and thus near-ideal pressure-sensing performance. Using a closed-cell pillar array structure in synergy with the ultraslippery electrode surface, our sensor achieved outstanding linearity (R 2 = 0.99944 ± 0.00015; nonlinearity, 1.49 ± 0.17%) while simultaneously possessing ultralow hysteresis (1.34 ± 0.20%) and very high sensitivity (79.1 ± 4.3 pF kPa−1). The sensor can operate under turbulent flow, in in vivo biological environments and during laparoscopic procedures. We anticipate that such a strategy will enable ultrasensitive and ultraprecise pressure monitoring in complex fluid environments with performance beyond the reach of the current state-of-the-art.

Original languageEnglish (US)
Pages (from-to)1352-1360
Number of pages9
JournalNature Materials
Volume22
Issue number11
DOIs
StatePublished - Nov 2023

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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