Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 224, Issue -, Pages 738-746Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.10.088
Keywords
Flexible NO2 sensor; RGO; MWCNTs; WO3 NPs; Hybrid; PI/PET substrate
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [NRF-2014R1A2A2A01002668]
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This study explores the fabrication and evaluation of a flexible NO2 sensor based on a tungsten trioxide nanoparticle-loaded, multi-walled carbon nanotube, reduced graphene oxide hybrid (WO3 NP-loaded MWCNT-RGO) on a polyimide/polyethylene terephthalate (PI/PET) substrate. A viscous gel of the hybrid materials was prepared using ce.-terpineol. The fabricated sensor exhibits excellent NO2 sensing with a maximum response of 17% to 5 ppm, a limit of detection (LOD) of 1 ppm, and relatively short response/recovery time (7115 min). The mechanical robustness of fabricated sensor was evaluated systematically at different curvature angles (0-90 degrees) and after various times bending/relaxing (up to 10(7)). The sensor exhibits excellent mechanical flexibility and sensing properties at room temperature without significant performance degradation, even at a curvature angle of 90 degrees and after 10(6) cycles of the bending/relaxing process. These results and the economical, light-weight and mechanically-robust features indicate that the proposed WO3 NPs-MWCNTs-RGO hybrid sensor is a promising building block for the development of high-performance, flexible NO2 sensors. (C) 2015 Elsevier B.V. All rights reserved.
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