Developing high-performance chemiresistive gas sensors with mechanical compliance for environmental or health-related biomarker monitoring has recently drawn increasing research attention. Among them, two-dimensional MXene materials hold great potential for room-temperature hazardous gas (e.g., NH₃) monitoring regardless of the complicated fabrication process, insufficient 2D/3D flexibilities, and poor environmental sustainability. Herein, a Ti₃C₂T_x MXene/gelatin ink was developed for patterning electrodes through a facile spray coating. Particularly, the patterned Ti₃C₂T_x-based coating exhibited good adhesion on the paper substrate against repeated peeling-off and excellent mechanical flexibility against 1000 cyclic stretching. The porous morphology of the coating facilitated the NH₃ sensing ability. As a result, the 2D kirigami-shaped NH₃ sensor exhibited a good response of 7% to 50 ppm of NH₃ with detectable concentrations ranging from 5–500 ppm, decent selectivity over interferences, etc., which could be well-maintained even at 50% stretched state. In addition, with the help of mechanically guided compressive buckling, 3D mesostructured MXene origamis could be obtained, holding promise for detecting the coming direction and height distribution of hazardous gas, e.g., the NH₃. More importantly, the as-fabricated MXene/gelatin origami paper could be fully degraded in PBS/H₂O₂/cellulase solution within 19 days, demonstrating its potential as a high-performance, shape morphable, and environmentally friendly wearable gas sensor.

中文翻译：

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通过轻松 MXene 喷涂获得全瞬态 3D 折纸纸基氨气传感器

开发具有机械顺应性的高性能化学电阻气体传感器，用于环境或健康相关的生物标志物监测，最近引起了越来越多的研究关注。其中，二维MXene材料尽管制造工艺复杂、2D/3D灵活性不足、环境可持续性差，但在室温有害气体（例如NH ₃ ）监测方面具有巨大潜力。在此，开发了一种 Ti ₃ C ₂ T _x MXene/明胶墨水，用于通过简便的喷涂对电极进行图案化。特别地，图案化的Ti ₃ C ₂ T _x基涂层在纸基材上表现出良好的抵抗反复剥离的粘附力以及抵抗1000次循环拉伸的优异的机械柔韧性。涂层的多孔形态有利于NH ₃传感能力。结果，二维剪纸形NH _{3传感器对7%至50 ppm的NH 3}表现出良好的响应，可检测浓度范围为5-500 ppm，对干扰具有良好的选择性等，即使在环境条件下也能很好地保持。 50%拉伸状态。此外，借助机械引导压缩屈曲，可以获得3D介观结构MXene折纸，有望用于检测危险气体（例如NH ₃ ）的到来方向和高度分布。更重要的是，所制备的MXene/明胶折纸可以在PBS/H ₂ O ₂ /纤维素酶溶液中在19天内完全降解，展示了其作为高性能、形状可变形且环保的可穿戴气体传感器的潜力。