Zhang Wanglin, Wu Xuanhao, Peng Xiaoyan, Zhu Li, Wang Hongkang, Liu Hui, Yuan Hongye
State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Key Laboratory, Engineering University of PAP, Xi'an, 710086, P. R. China.
Small. 2024 Dec;20(50):e2405636. doi: 10.1002/smll.202405636. Epub 2024 Sep 28.
The advancement of wireless gas sensing signifies a substantial leap forward in gas detection and intelligent monitoring technologies. This necessitates stringent design criteria for gas sensitive materials with good solution processability, conductivity, and porosity, whose design and synthesis remain challenging yet highly sought-after. Herein, the fabrication of NUS-8/polyaniline (PANI) nanosheets is presented with excellent solution processability, high porosity, triboelectric property, and superior electrical conductivity via a template-directed polymerization strategy. Solution processable NUS-8 nanosheets, synthesized directly by a "one-pot" approach, serve as templates to enhance the "on-site" polymerization of aniline, resulting in the formation of PANI layer on NUS-8 nanosheets with a thickness of 7 nm. The resultant NUS-8/PANI nanosheets exhibit outstanding solution processability, and a film conductivity of 8.6 S m. The solution processability enables the facile fabrication of homogeneous and compact NUS-8/PANI films and thus their integration onto electronic devices targeted for multifunctional sensing. The NUS-8/PANI coated sensors demonstrate sensitive and selective detection at room temperature toward ultratrace ammonia with a detection limit of 120 ppb. A wireless sensing system based on the NUS-8/PANI-coated sensor is capable to monitor the spoilage process of meat. This study paves novel avenues for designing and synthesizing gas-sensitive materials for practical applications.
无线气体传感技术的进步标志着气体检测和智能监测技术向前迈出了重要一步。这就要求对具有良好溶液可加工性、导电性和孔隙率的气敏材料制定严格的设计标准，而这类材料的设计与合成仍然具有挑战性，但却备受关注。在此，通过模板导向聚合策略制备了具有优异溶液可加工性、高孔隙率、摩擦电性能和卓越导电性的NUS-8/聚苯胺（PANI）纳米片。通过“一锅法”直接合成的可溶液加工的NUS-8纳米片用作模板，以增强苯胺的“原位”聚合，从而在NUS-8纳米片上形成厚度为7纳米的PANI层。所得的NUS-8/PANI纳米片表现出出色的溶液可加工性，薄膜电导率为8.6 S/m。溶液可加工性使得能够轻松制备均匀且致密的NUS-8/PANI薄膜，进而将它们集成到用于多功能传感的电子设备上。涂覆有NUS-8/PANI的传感器在室温下对超痕量氨表现出灵敏且选择性的检测，检测限为120 ppb。基于涂覆有NUS-8/PANI的传感器的无线传感系统能够监测肉类的腐败过程。本研究为设计和合成用于实际应用的气敏材料开辟了新途径。
