Moisture-resistant MXene-sodium alginate sponges with sustained superhydrophobicity for monitoring human activities

Yangchengyi Liu, Zhong Sheng, Jielong Huang, Weiyi Liu, Hongyan Ding, Jinfeng Peng, Bowen Zhong, Yuhui Sun, Xiaoping Ouyang, Huanyu Cheng, Xiufeng Wang

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Wearable mechanical sensors are susceptible to moisture, causing inaccuracy for monitoring human health and body motions. Although the superhydrophobic barrier on the sensor surface has been extensively explored as a passive water repel strategy, the dense superhydrophobic surface often has limited flexibility and inevitably degradates in high humidity or saturated water vapor environments due to the nucleation and growth of small size water molecules. This work reports a superhydrophobic MXene-sodium alginate sponge (SMSS) pressure sensor with efficient low-voltage Joule heating to provide sustained superhydrophobicity for moisture-resistant sensing. The superhydrophobic surface on the outside can repel large size water droplets, whereas the Joule heating efficiently removes small size water droplets and significantly reduces water molecule adsorption throughout the sponge. Because of the sustained superhydrophobic barrier and high porosity in the sponge, the SMSS pressure sensor with high sensitivity, large sensing range, and quick response can accurately and reliably function and monitor varying biophysical signals even in extreme use scenarios with high humidity or water vapor environments.

Original languageEnglish (US)
Article number134370
JournalChemical Engineering Journal
Volume432
DOIs
StatePublished - Mar 15 2022

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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