Highly Sensitive, Selective and Flexible NO 2 Chemiresistors Based on Multilevel Structured 3D RGO Fiber Scaffold Modified with Aminoanthroquinone Moieties and Ag Nanoparticles.

Highly sensitive, selective and room-temperature-performed gas sensors are always the pursuit in the sensing field for practical applications. However, the existing gas sensors can seldom satisfy the aforementioned requirements. Here, we integrate zero-dimensional Ag nanoparticles (AgNP), one-dimensional polymer fibers and two-dimensional aminoanthroquinone functioned reduced graphene oxide (AQRGO) sheets into a three-dimensional sensing scaffold (AgNP-3D-AQRGO) for high performance NO2 sensing. The AQ moieties and AgNP are decorated onto the RGO sheets through a wet chemical route. Electrospinning and self-assembly technique are employed to assemble the polymer fibers and the functional RGO sheets into a three-dimensional scaffold. The resulting AgNP-3D-AQRGO based gas sensor can be performed at room temperature and exhibits excellent sensing performance for NO2 , including an ultrahigh sensitivity (10.3 ppm-1 ), an ultralow limit of detection (0.6 ppb) and an extremely remarkable selectivity for solely NO2 molecules. Furthermore, the sensor is also highly flexible, demonstrating great potential for portable and real-time monitoring of toxic gas in personal mobile electronics.