Selective ammonia sensor based on copper oxide/reduced graphene oxide nanocomposite

Sakthivel, Bhuvaneshwari; Gopalakrishnan, N.

doi:10.1016/j.jallcom.2019.02.245

Cited by 83 publications

(30 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among the approaches used, tailoring of composite metal oxides with different morphologies presents a good potential for tuning the sensitivity and selectivity during gas sensing. Many recent studies have shown that the selectivity and operating temperature of resistive-type gas sensors can be improved through the use of composite metal oxides (Andre et al, 2019;He et al, 2019;Rong et al, 2019;Sakthivel and Nammalvar, 2019).…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis

et al. 2019

View full text Add to dashboard Cite

This work reports the fabrication of mixed structure of ZnO nanorod on SnO 2 thin film via spray pyrolysis followed by thermal annealing and their gas sensing properties. ZnO/SnO 2 nanostructures are successfully prepared on a gold interdigitated alumina substrate by spraying varying mixed precursor concentrations of zinc acetate and tin (IV) chloride pentahydrate solutions in ethanol and thermal annealing. The morphology of the nanostructures is controlled by tailoring the Zn:Sn ratio in the precursor solution mixture. Unique ZnO crystals and ZnO nanorods are observed under a field emission scanning electron microscopy (FESEM) when the Zn/Sn ratio in the precursor solution is in between 13:7 and 17:3 after thermal annealing. The fabricated nanostructures are tested for ethanol, methane and hydrogen in air ambient for various gas concentrations ranging from 25 to 400 ppm and the effect of fabrication conditions on the sensitivity and selectivity are studied. Among the nanostructure sensors studied, the film fabricated with molar ratio of Zn/Sn =3:1 shows better sensitivity and selectivity to ethanol due to high sensing surface area of the nanorod. The response to 25 ppm ethanol is found to be as high as 50 at an operating temperature of 400 • C.

show abstract

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Also, the specific surface area obtained after test was 106 m 2 g −1 instead of 109 m 2 g −1 . Copper(II) oxide was chosen between different transition metal oxides because it is cited in the bibliography as one of the most oxidation-active oxides and the most selective in oxidation of NH 3 to N 2 [8,10,[30][31][32]. After test a decrease in the dispersion from 7 to 6% which represents 14% of relative loss was calculated, thus reducing the number of active sites and decreasing the number of surface oxygen.…”

Section: Resultsmentioning

confidence: 99%

Selective catalytic oxidation of NH3 into N2 during biogas combustion over 2 wt%PdO/5 wt%CuO/γ-Al2O3

Abbas-Ghaleb

Chlala

2020

SN Appl. Sci.

View full text Add to dashboard Cite

This work consists in the study of catalysts likely to present a good activity in the combustion of the landfill biogas for its valorization and a high performance in the selective catalytic oxidation of NH 3 to N 2. In this study, biogas catalytic combustion was investigated on 2 wt%PdO/5 wt%CuO/γ-Al 2 O 3 catalyst. This catalyst was prepared by wet impregnation than the catalytic reactivity was tested under atmospheric pressure using the following mixture: CH 4 (1 vol%), CO 2 (0.6 vol%), O 2 (4 vol%), H 2 O (0.1 vol%), 1000 ppm NH 3 and He with a total flow rate of 100 cm 3 min −1 and compared with 2 wt%PdO/Al 2 O 3 and 5 wt%CuO/Al 2 O 3. Furthermore, these different catalysts were characterized by inductively coupled plasma atomic emission spectroscopy, specific surface area analysis (BET), X-ray diffraction, diffuse reflectance spectroscopy and H 2 temperature-programmed reduction (H 2-TPR). This study showed that 2 wt%PdO/5 wt%CuO/γ-Al 2 O 3 catalyst exhibited a better performance towards the selective catalytic oxidation of NH 3 into N 2 compared to the other catalysts with a methane conversion corresponding to the best compromise in between.

show abstract

“…In addition, the presence of surface defects also led to increasing the sensing performance because the surface defects facilitate more adsorption sites for gas adsorption. 52 Therefore, it is concluded that the porous microstructure, p/n heterojunction and surface defects are an important factor for the enhancement of sensing performance. In our case, p-type PANI and n-type Cu-ZnS in composite formed a p-n heterojunction at the interface, which would increase the sensing response.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Investigation of the structural, optical and gas sensing properties of PANI coated Cu–ZnS microsphere composite

et al. 2020

View full text Add to dashboard Cite

show abstract

Selective ammonia sensor based on copper oxide/reduced graphene oxide nanocomposite

Cited by 83 publications

References 39 publications

Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis

Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis

Selective catalytic oxidation of NH3 into N2 during biogas combustion over 2 wt%PdO/5 wt%CuO/γ-Al2O3

Investigation of the structural, optical and gas sensing properties of PANI coated Cu–ZnS microsphere composite

Contact Info

Product

Resources

About