Abstract
Multi-responsive functional materials with simultaneous photothermal and photoluminescent properties have broad applicational prospects in the field of flexible electronics, devices and remote force detection and monitor. Here, a feasible method is developed by introducing MoO3-x quantum dots (MoO3-x QDs) and blue fluorescent carbon dots (B-CDs) into a strong hydrogel matrix to fabricate a novel composite hydrogel with concurrent photothermal and photoluminescent properties. Besides rendering the peculiar multifunctionalities, we found that the addition of photothermal MoO3-x QDs enhances the mechanical properties and self-healing properties of the composite hydrogel. The temperature of the MoO3-x-CDs-PVA (Polyvinyl Alcohol) hydrogel can rise by 30 °C within 1 min after 808 nm infrared laser irradiation and the self-healing efficiency could double after 40 s of irradiation. Moreover, there is a good linear relationship between the fluorescence intensity of the composite hydrogel and the external force, which can be used to monitor the force within a certain range. The monitoring range and sensitivity can be further improved by adjusting the infrared laser to for small force detection. Finally, the novel composite hydrogel is successfully applied to fracture monitoring in fracturing and force monitoring at different locations in the fluid model in the field of petroleum engineering.
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