Synthesis and Studies of PAM-Ag-g/WS₂/Ti₃C₂T_x Hydrogel and Its Possible Applications

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Chemistry

Background:

• Flexible electronics require advanced materials with high conductivity and mechanical stability.
• Hydrogels offer biocompatibility and flexibility but often lack sufficient conductivity for sensing applications.
• Nanomaterials like WS₂ and Ti₃C₂T_x can enhance the properties of polymer matrices.

Purpose of the Study:

• To synthesize a novel hybrid hydrogel composite for flexible strain sensing.
• To investigate the synergistic effects of WS₂/Ti₃C₂T_x on hydrogel properties.
• To evaluate the performance of the composite as a wearable strain sensor.

Main Methods:

• Radical polymerization was used to synthesize the polyacrylamide (PAM)-Ag-g/WS₂/Ti₃C₂T_x hybrid hydrogel.
• The conductive heterostructural nanocomposite WS₂/Ti₃C₂T_x was integrated into the polymer matrix.
• The strain-sensing capabilities, conductivity, mechanical strength, and response times were measured.

Main Results:

• The composite hydrogel exhibited high extensibility and conductivity.
• Excellent strain-sensing capabilities were observed with gauge factors of 1.4 (low strain) and 2.8 (high strain).
• Fast response (2.17 s) and recovery (0.46 s) times confirmed reliability and reproducibility under cyclic stretching.

Conclusions:

• The PAM-Ag-g/WS₂/Ti₃C₂T_x composite hydrogel shows significant potential as a flexible wearable strain sensor.
• The WS₂/Ti₃C₂T_x interface plays a crucial role in enhancing conductivity and gauge factor.
• Theoretical modeling indicated strain-induced electronic structure changes at the WS₂/Ti₃C₂T_x interface, suggesting tunable sensing properties.