Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 51, Pages 44603-44613Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b15445
Keywords
palladium nanoparticle; flexible; transparent; hydrogen gas sensor; nanogranular
Funding
- National Natural Science Foundation of China [51871091, 11627806, 21802038, 11604161, 11604310]
- Scientific Research Project of Education Department of Hubei Province [Q20182505]
- Hubei Key Laboratory of Pollutant Analysis and Reuse Technique (Hubei Normal University) [PA20170204]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [16KJB140009]
- Natural Science Foundation of Jiangsu Province [BK20160914]
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Alongside the rise in fully automated equipment and wearable devices, there is currently a high demand for optically transparent and flexible gas sensors operating at room temperature. Nanoparticle films are ideal H-2-sensing materials that can be coupled with flexible substrates because of their discrete nanogranular structure and unique inter-particle electrical responsiveness. In this work, we present an optically transparent and flexible H-2 sensor based on a Pd nanoparticle film, prepared on a polyethylene terephthalate sheet using a straightforward nanocluster deposition technique. Hundreds of bending cycles demonstrated that the sensor has good electrical stability and mechanical robustness without significant degradation in H(2-)sensing performance. The H-2 sensing behaviors under bent state were systematically evaluated. The loading of tensile and compressive strains under bent state produced a positive and negative influence, respectively, on the sensing performances. The possible influence mechanism of the tensile and compressive strains on the H-2 sensing performance was attributed to the changes in the percolation network topology and the interparticle space induced by the strains. The ability to detect a H-2 concentration as low as 15 ppm, dynamic response range as wide as 0-10%, and sub-10 s response time was achieved. In addition, the sensor can be operated in the relative humidity range of 0-90% at room temperature. These results demonstrate that the sensor exhibits significant potential for next-generation transparent and flexible H-2 detectors.
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