PAN/(PAN-b-PMMA) derived Nanoporous Carbon Nanofibers loaded on ZnO Nanostructures for Hydrogen Detection

Singh Bhati, Vijendra and Nathani, Akash and Sharma, Chandra Shekhar and et al, . (2019) PAN/(PAN-b-PMMA) derived Nanoporous Carbon Nanofibers loaded on ZnO Nanostructures for Hydrogen Detection. Sensors and Actuators B: Chemical. p. 126980. ISSN 09254005

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Abstract

The present report investigates hydrogen gas sensing properties on PAN/(PAN-b-PMMA) derived electrospun nanoporous carbon nanofibers loaded on ZnO nanostructures. Polymer blend of PAN and PAN-b-PMMA is used to obtain the high surface area porous CNF which improve further sensing performance. Moreover, a facile technique such as drop cast method is used to load the CNF (0.1-0.5 wt.%) on Au pattern interdigitated electrodes over ZnO nanostructures. Loading of CNF was optimized to ensure proper connection between the electrodes over ZnO surface, which was measured using I-V characteristics. Initially, current decreased for less amount of CNF (0.1-0.2 wt.%), which later increased for high concentration of CNF (0.3-0.5 wt.%). It was further observed that 0.2 wt% CNF/ZnO nanostructures based sensor exhibited maximum sensing response (73.54%) as compared to CNF (3.29%) and ZnO (44.51%) for 100 ppm hydrogen at 150 °C. This enhanced sensing response may be attributed to diffusion of hydrogen molecules through the nanoporous CNF, thus enabling the formation of p - n heterojunction at the interface of CNF and ZnO. The presence of oxygen functional groups on CNF surface also contributes to the enhancement of the sensing performance.

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