Hui Yang,Na Kong,Mia Angela Judicpa,Ken Aldren S. Usman,Jinlong Tao,Joselito M. Razal,Jizhen Zhang,Yanqiu Shao
Real-time tracking of metabolites, ions, and biomarkers in sweat using wearable sensors is crucial for advancing point-of-care testing, where improving the stability of these technologies is a major focus. In this research, a compact, highly sensitive, and stable real-time electrochemical sweat sensor capable of monitoring changes in hydrogen ion concentration is developed. By surface functionalizing Ti 3 CNT x and combining it with a polyaniline film, a small, flexible pH sensor is fabricated to track biochemical reactions by examining sweat pH during exercise and wound healing. The fluorinated alkyl silane-modified surface significantly increases the contact angle, enhancing the sensor's performance. The assembled pH sensor demonstrates pH-sensitivity of −42.91 (pH 11–1) and −40.15 mV pH−¹ (pH 1–11), comparable to transition metal oxide-based sensors. Additionally, it shows good selectivity through continuous addition and separated solution methods. The modified Ti 3 CNT x exhibited excellent durability in different ionic solutions for over 30 days. The flexible, precise sensor, developed via scalable screen-printing, can be applied in water quality monitoring, food preservation, product processing, biomarker monitoring, and human health.
Beibei Ma,Fu Chen,Yongzhi Cheng,Xiangcheng Li,Hui Luo
Microwave absorbing materials (MAMs) have been used to address electromagnetic pollution for both civil and military applications, and MAMs with broadband microwave absorption still remain a challenge. The microwave absorption performance of Ti 3 CNT x MXene is poor due to impedance mismatch. Modification of Ti 3 CNT x with magnetic materials is an effective way to improve the impedance matching and increase the effective absorption bandwidth (EAB). Here, 2D Ti 3 CNT x based magnetic composites were successfully prepared by an electrostatic self-assembly method. The microwave absorption properties of the composites were investigated by varying the loading of Ti 3 CNT x in the composites and the filling ratio of the composites in the absorber. The EAB can reach 4.75 GHz with an absorber thickness of only 1.32 mm. Integrated with a macroscale multilayer periodic gradient design, the FCM (Fe@NC/Ti 3 CNT x ) composites based metastructure exhibits broadband microwave absorption with an EAB of 12.5 GHz ranging from 5.5 GHz to 18 GHz at a total thickness of 4.5 mm. The microwave attenuation mechanisms were studied by dielectric loss, magnetic loss and impedance matching. The multi-scale development of MXene-based magnetic composites makes them possible to applied to broadband microwave absorption.
Zhen Xiang,Xiao Wang,Xiang Zhang,Yuyang Shi,Lei Cai,Xiaojie Zhu,Yanyan Dong,Wei Lu
Two-dimensional (2D) MXene materials have potential applications in electromagnetic pollution elimination and energy conversion fields owing to their high carrier mobility , specific surface area and unique layered features. Here, we demonstrated a controlled self-assembly strategy to construct multifunctional nano/microstructured 2D Ti 3 CNT x MXene-based composites for efficient electromagnetic attenuation and Joule energy conversion application. The multiple compositions and novel architecture endowed the layered porous Ti 3 CNT x /Ni@C composites with enhanced electromagnetic wave absorption and EMI shielding performances. Notably, the optimized nanocomposites achieved a high-performance electromagnetic wave absorption with a low loading (8 wt%), a broad effective absorption bandwidth (5.4 GHz) and a strong absorption (−65.7 dB) at a thickness of only 1.5 mm. The high electromagnetic shielding efficiency reached 66.7 dB. The underlying mechanism of electromagnetic shielding and absorption was the synergistic effects among electronic transport, abundant interfacial/dipolar polarization, strong magnetic coupling and multiple reflections in the layered porous structure . In addition, the efficient Joule energy conversion with favorable flame-retardant and high infrared shielding versatility broadened the practical application range of Ti 3 CNT x /Ni@C composites in harsh environments. Therefore, this assembly strategy inspires the construction and application of the 2D Mxene-based composites to promote the development of energy conversion and green electromagnetic environments.
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