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Article

ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors

1
Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
2
The Research Institute of Industrial Science, Hanyang University, Seoul 04763, Korea
3
Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz 71557-13876, Iran
4
Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(19), 4276; https://doi.org/10.3390/s19194276
Received: 27 August 2019 / Revised: 27 September 2019 / Accepted: 30 September 2019 / Published: 2 October 2019
(This article belongs to the Special Issue Metal Oxide Based Sensors)
Pd nanoparticle-functionalized, xIn2O3 (x = 0.05, 0.1, and 0.15)-loaded ZnO nanofibers were synthesized by an electrospinning and ultraviolet (UV) irradiation method and assessed for their hydrogen gas sensing properties. Morphological and chemical analyses revealed the desired morphology and chemical composition of the synthesized nanofibers. The optimal gas sensor namely Pd-functionalized, 0.1In2O3-loaded ZnO nanofibers showed a very strong response to 172–50 ppb hydrogen gas at 350 °C, which is regarded as the optimal sensing temperature. Furthermore, the gas sensors showed excellent selectivity to hydrogen gas due to the much lower response to CO and NO2 gases. The enhanced gas response was attributed to the excellent catalytic activity of Pd to hydrogen gas, and the formation of Pd/ZnO and In2O3/ZnO heterojunctions, ZnO–ZnO homojunction, as well as the formation of PdHx. Overall, highly sensitive and selective hydrogen gas sensors can be produced based on a simple methodology using a synergistic effect from Pd functionalization and In2O3 loading in ZnO nanofibers. View Full-Text
Keywords: Pd; In2O3; ZnO; hydrogen gas; gas sensor; sensing mechanism Pd; In2O3; ZnO; hydrogen gas; gas sensor; sensing mechanism
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MDPI and ACS Style

Lee, J.-H.; Kim, J.-H.; Kim, J.-Y.; Mirzaei, A.; Kim, H.W.; Kim, S.S. ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors. Sensors 2019, 19, 4276. https://doi.org/10.3390/s19194276

AMA Style

Lee J-H, Kim J-H, Kim J-Y, Mirzaei A, Kim HW, Kim SS. ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors. Sensors. 2019; 19(19):4276. https://doi.org/10.3390/s19194276

Chicago/Turabian Style

Lee, Jae-Hyoung, Jae-Hun Kim, Jin-Young Kim, Ali Mirzaei, Hyoun W. Kim, and Sang S. Kim. 2019. "ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors" Sensors 19, no. 19: 4276. https://doi.org/10.3390/s19194276

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