Interfacial Engineering of Printable MOF/MXene Heterostructured Inks for High‐Performance Wearable Ammonia Sensors

Precise molecular recognition and efficient signal transduction are pivotal for next‐generation wearable health‐monitoring platforms, particularly for detecting breath biomarkers like ammonia (NH 3 ) that indicate renal or hepatic distress. However, achieving high‐selectivity NH 3 sensing in complex, trace‐level environments is often hindered by low sensitivity. Herein, we report a sustainable, low‐temperature strategy for the synthesis of printable and textile‐compatible MOF/MXene heterostructured inks tailored for high‐performance NH 3 sensing. We demonstrate that precise interfacial engineering and functional group alignment between the MXene and MOF phases trigger a robust synergistic effect, significantly accelerating charge‐transfer kinetics. The resulting sensor achieves an extraordinary detection limit of 3 ppb, markedly outperforming current state‐of‐the‐art benchmarks. For practical application, the sensing unit was integrated into a custom wearable wristband equipped with real‐time signal processing and wireless transmission modules, exhibiting sensing capabilities on par with commercial sensors. This tailored synthesis strategy, coupled with systematic platform integration, enables non‐invasive monitoring of trace NH 3 in human breath. This synergy provides a viable approach for the early screening of chronic kidney disease (CKD) while expanding the horizons for functional material development in next‐generation intelligent wearable diagnostics.