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<p>MXene-based hydrogels have become important materials for epidermal applications due to their excellent conductive properties and biocompatibility. Nonetheless, the application of such materials in the epidermal field is limited because of insufficient mechanical properties, unidimensional stimulus response, and complex preparation methods. In this study, an MXene-based hydrogel with outstanding self-healing, temperature sensitivity, and pH sensitivity was prepared by a one-pot method at 60°C for 5&#xa0;h. The hydrogel is composed of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nano-slices, polyacrylamide (PAM), poly(<i>N</i>-isopropylacrylamide) (PNIPA), and polyacrylic acid (PAA), denoted as MXene/PAM/PNIPA/PAA hydrogel (MPANA hydrogel). The MPANA hydrogel exhibits excellent mechanical properties. Its tensile strength, elastic modulus, toughness, and elongation at break are 2.79&#xa0;MPa, 0.64&#xa0;MPa, and 51&#xa0;MJ/m<sup>3</sup>, 412%, respectively, which indicates that the hydrogel possesses good stretchability. Moreover, the MPANA hydrogel demonstrates good self-healing ability, attaining an average strain self-healing efficiency of 94%, achieved in 12&#xa0;h. Additionally, the MPANA hydrogel shows impressive thermal response sensitivity (−1.3560%&#xa0;°C<sup>−1</sup>) and a rapid pH response time (32–53&#xa0;s). In conclusion, the MPANA hydrogel has significant potential for applications in epidermal sensors.</p> Graphical Abstract

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Self-healable, Temperature-Sensitive, pH-Sensitive Ti3C2TX MXene Hydrogel as an Epidermal Sensor

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Xiaoli Yang,
  • Xiaomin Zhang,
  • Han Zhang,
  • Yuhan Cong,
  • Zitan Wang,
  • Erkang Ye

摘要

MXene-based hydrogels have become important materials for epidermal applications due to their excellent conductive properties and biocompatibility. Nonetheless, the application of such materials in the epidermal field is limited because of insufficient mechanical properties, unidimensional stimulus response, and complex preparation methods. In this study, an MXene-based hydrogel with outstanding self-healing, temperature sensitivity, and pH sensitivity was prepared by a one-pot method at 60°C for 5 h. The hydrogel is composed of Ti3C2Tx MXene nano-slices, polyacrylamide (PAM), poly(N-isopropylacrylamide) (PNIPA), and polyacrylic acid (PAA), denoted as MXene/PAM/PNIPA/PAA hydrogel (MPANA hydrogel). The MPANA hydrogel exhibits excellent mechanical properties. Its tensile strength, elastic modulus, toughness, and elongation at break are 2.79 MPa, 0.64 MPa, and 51 MJ/m3, 412%, respectively, which indicates that the hydrogel possesses good stretchability. Moreover, the MPANA hydrogel demonstrates good self-healing ability, attaining an average strain self-healing efficiency of 94%, achieved in 12 h. Additionally, the MPANA hydrogel shows impressive thermal response sensitivity (−1.3560% °C−1) and a rapid pH response time (32–53 s). In conclusion, the MPANA hydrogel has significant potential for applications in epidermal sensors.

Graphical Abstract