Highly Sensitive Flexible Thermal Sensors Based on a Kind of MXene/DES Inks AITranslate

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DOI：https://doi.org/10.1021/acsaelm.2c01710

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Extremely hot weather has emerged more and more frequently in recent years, which has caused some serious disasters such as forest fires, heat-related illnesses, machine breakdowns, and so on. Flexible thermal sensors will be an efficient solution to achieve large area coverage of thermal alarm systems, due to their merits of low cost, portability, and easy processing. In the preparation of flexible sensors, the printing method stands out for its efficient and inexpensive characteristics. In this work, just by combining the high-NIR photothermal conversion material MXene (Ti3C2Tx) and thermosensitive substance metal salt (FeCl3)-based deep eutectic solvents (DES), conductive thermally sensitive inks were prepared. The MXene/DES-based ink with a suitable viscosity can be smoothly screen-printed on A4 paper. The as-prepared sensors can quickly generate heat even up to over 200 °C and simultaneously respond to the temperature change under near-infrared light (NIR, 808 nm). The type of metal salt can be replaced with other common metals, such as AlCl3, ZnCl2, SnCl2, and CuCl2, and some of them also presented good photothermal conversion ability. These inks are easy to synthesize, and the printed sensors are portable and easy to integrate, which make them a good candidate for building flexible thermal alarm systems.