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Title: Highly selective and efficient room temperature NO2 gas sensors based on Zn-doped CuO nanostructure-rGO hybrid
Authors: Jyoti
Srivastava A.K.
Varma, Ghanshyam Das
Published in: Journal of Materials Science: Materials in Electronics
Abstract: In 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.
Citation: Journal of Materials Science: Materials in Electronics, 29(12): 10640-10655
Issue Date: 2018
Publisher: Springer New York LLC
Keywords: Casting
Chemical detection
Chemical sensors
Chlorine compounds
Copper oxides
Gas detectors
Gas sensing electrodes
Hybrid sensors
Nitrogen oxides
Oxide films
Scanning electron microscopy
Semiconducting films
Semiconductor doping
Thin films
Transmission electron microscopy
Field emission scanning electron microscopes
Gas sensing behavior
Gas sensing response
Micro-structural characteristics
Reduced graphene oxides (RGO)
Semiconducting behavior
Temperature-dependent resistance
Wet-chemical method
Hybrid materials
ISSN: 9574522
Author Scopus IDs: 57214348043
Author Affiliations: Jyoti, Department of Physics, Indian Institute of Technology, Roorkee, 247667, India
Srivastava, A.K., Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore, 452013, India
Varma, G.D., Department of Physics, Indian Institute of Technology, Roorkee, 247667, India
Funding Details: 
Corresponding Author: Varma, G.D.; Department of Physics, India; email:
Appears in Collections:Journal Publications [PH]

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