Bioinspired mineral MXene hydrogels for tensile strain sensing and radionuclide adsorption applications

doi:10.1007/s11467-022-1181-2

Front. Phys.

2022, Vol. 17

Issue (6) : 63501 https://doi.org/10.1007/s11467-022-1181-2

RESEARCH ARTICLE

Bioinspired mineral MXene hydrogels for tensile strain sensing and radionuclide adsorption applications

Xin Li^1,², Guangcun Shan^1,²(

), Ruguang Ma^2,⁴, Chan-Hung Shek², Hongbin Zhao³(

), Seeram Ramakrishna⁵

¹. School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China
². Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong SAR, China
³. State Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing 100088, China
⁴. Institute of Materials Science and Devices, Suzhou University of Science and Technology, Suzhou 215009, China
⁵. Department of Mechanical Engineering & Circular Economy Taskforce, National University of Singapore, Singapore 119077, Singapore

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Abstract

MXene-based hydrogels have drawn considerable attention as flexible and wearable sensors. However, the application of MXene-based hydrogels after sensing failure has rarely been investigated, which is of great significance for expanding their engineering application. In this work, multifunctional mineral MXene hydrogels (MMHs) were synthesized via a simple method inspired by biomineralization. The prepared MMHs were stretchable, self-healable and conductive, and can be used to fabricate wearable tensile strain sensors showing a super-wide sensing range with excellent sensitivity. MMHs-based strain sensors were designed to be directly attached to the skin surface to detect tiny and large human motions. In addition, with the advantages of a large specific area, excellent hydrophilicity and abundant active adsorption sites for MXene nanosheets and hydrogels, dehydrated MMHs were used as highly efficient adsorbents for the removal of strontium ions from aqueous solutions. This work shows the great potential of MXene in promoting the development of next-generation functional materials.

Keywords MXene hydrogel flexible sensor adsorption

Corresponding Author(s): Guangcun Shan,Hongbin Zhao

Issue Date: 15 July 2022

Cite this article:

Xin Li,Guangcun Shan,Ruguang Ma, et al. Bioinspired mineral MXene hydrogels for tensile strain sensing and radionuclide adsorption applications[J]. Front. Phys. , 2022, 17(6): 63501.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-022-1181-2
https://academic.hep.com.cn/fop/EN/Y2022/V17/I6/63501

Fig.1 (a) Schematic illustration of the microstructure of MMHs. (b) SEM image of freeze-dried MMHs sample. (c) FT-IR spectra of PAA, ACC-PAA and MMHs. (d) XPS survey spectra of MMHs. (e) MMHs were manipulated into different kinds of shapes.

Fig.2 MMHs-based tensile strain sensors and their performance. (a) Illustration of the sandwich structure of the MMHs-based strain sensor. The inset is an optical image of the sandwich strain sensor with two silver wires as electrodes. (b, c) Real-time relative resistance variation response of the sandwich strain sensor under different strain magnitude with a constant frequency of 0.05 Hz. The insets show the relative response versus strain. (d) The relative resistance variation response of the sandwich strain sensor under different strain frequencies with a constant strain magnitude of 50%. (e) Schematic of the fabrication method of the fiber strain sensor. The inset is an optical image of the fiber strain sensor with two silver wires as electrodes. (f) The relative resistance variation responses of the fiber strain sensor under strain with a magnitude of 50% and a frequency of 0.05 Hz.

Fig.3 Using flexible and wearable MMHs-based sandwich strain sensor to monitor various human motions. (a?c) Real-time relative resistance variation waveform corresponding to elbow bending with different angles, finger and knee joint bending, respectively. The insets show where the strain sensor was attached. (d) Real-time relative resistance variation waveform in response to swallowing.

Fig.4 Batch adsorption of Sr²⁺ ions onto the MMHs dried naturally. (a) Effects of contact time on the removal efficiency. (b) The time-dependent sorption pseudo-first-order kinetic plots.

Tab.1 Kinetic parameters for Sr²⁺ adsorption onto MMHs described by the pseudo-first-order and pseudo-second-order models.

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