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dc.contributor.authorSrivastava A.K.-
dc.contributor.authorVarma, Ghanshyam Das-
dc.identifier.citationJournal of Materials Science: Materials in Electronics, 29(12): 10640-10655-
dc.description.abstractIn the present work nanostructures of Zn-doped CuO with nominal compositions Cu1−xZnxO (x = 0, 0.03, 0.05, 0.07, 0.10, 0.15) have been synthesized via wet chemical method. The field-emission scanning electron microscope (FESEM) and transmission electron microscope (TEM) results show the formation of 1-D nanochain type morphology in pristine CuO and the same is retained up to Zn doping of 7% (x = 0.07). However, for higher Zn doping (x > 0.07) microflower type morphology is observed. The thin films of the as-synthesized pristine and Zn-doped CuO-reduced graphene oxide (rGO) hybrid materials have been fabricated by drop casting method on glass substrates to study their electrical and gas sensing behavior. The temperature dependent resistance measurements confirm semiconducting behavior of the hybrid films. The gas sensing performances of all hybrid films for NO2 gas have been systematically investigated. The results demonstrate that Zn doping in CuO remarkably increases the gas sensing response as compared to pristine CuO. For example, 5% Zn-doped CuO-rGO hybrid sensor shows percentage response of ~ 54.5, whereas pristine CuO-rGO hybrid sensor shows percentage response of ~ 19.6. Furthermore, sensing performance of hybrid films initially increases with increasing x up to x = 0.07 and after this it starts decreasing with x. The measurements of sensing response for x = 0.05 in the temperature range 296–343 K for 40 ppm NO2 exhibit maximum response at room temperature (296 K) and the lowest detection limit of ~ 6 ppm NO2. Moreover, the hybrid sensors exhibit almost negligible response to other gases like CO, NH3, H2S and Cl2 at room temperature, indicating their excellent selectivity towards NO2 gas. The detail correlations between the microstructural characteristics of Zn doped CuO nanostructures and gas sensing behavior of the corresponding hybrid films have been discussed and described in this paper. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.-
dc.publisherSpringer New York LLC-
dc.relation.ispartofJournal of Materials Science: Materials in Electronics-
dc.subjectChemical detection-
dc.subjectChemical sensors-
dc.subjectChlorine compounds-
dc.subjectCopper oxides-
dc.subjectGas detectors-
dc.subjectGas sensing electrodes-
dc.subjectHybrid sensors-
dc.subjectNitrogen oxides-
dc.subjectOxide films-
dc.subjectScanning electron microscopy-
dc.subjectSemiconducting films-
dc.subjectSemiconductor doping-
dc.subjectThin films-
dc.subjectTransmission electron microscopy-
dc.subjectField emission scanning electron microscopes-
dc.subjectGas sensing behavior-
dc.subjectGas sensing response-
dc.subjectMicro-structural characteristics-
dc.subjectReduced graphene oxides (RGO)-
dc.subjectSemiconducting behavior-
dc.subjectTemperature-dependent resistance-
dc.subjectWet-chemical method-
dc.subjectHybrid materials-
dc.titleHighly selective and efficient room temperature NO2 gas sensors based on Zn-doped CuO nanostructure-rGO hybrid-
dc.affiliationJyoti, Department of Physics, Indian Institute of Technology, Roorkee, 247667, India-
dc.affiliationSrivastava, A.K., Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India-
dc.affiliationVarma, G.D., Department of Physics, Indian Institute of Technology, Roorkee, 247667, India-
dc.description.correspondingauthorVarma, G.D.; Department of Physics, India; email:
Appears in Collections:Journal Publications [PH]

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