Tailoring oxygen sensing characteristics of Co3O4 nanostructures through Gd doping

Fareed, S.; Medwal, Rohit; Vas, Joseph Vimal; Khan, Ijaz Ahmad; Rawat, Rajdeep Singh; Rafiq, M. A.

doi:10.1016/j.ceramint.2019.12.211

Cited by 33 publications

(10 citation statements)

References 35 publications

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“…However, cobalt introduction clearly alters the few top nanometers of the sup- respectively, 20,32 while the Co 3+ species usually appear at 780.0 eV or lower binding energies (a small shoulder in the XPS spectrum). [33][34][35][36][37][38][39][40][41][42][43] However, what is more important in this work is the amount of cobalt impregnated, since the next practical step in catalyst preparation would be reduction.…”

Section: Resultsmentioning

confidence: 99%

“…Both main peaks of Co 2p 3/2 and Co 2p 1/2 are indicative of Co 2+ and possibly Co 3+ species. The components with a binding energy of 781.0 and 783.3 eV can be assigned to Co 2+ in CoO and Co(OH) 2 , respectively, 20,32 while the Co 3+ species usually appear at 780.0 eV or lower binding energies (a small shoulder in the XPS spectrum) 33–43 . However, what is more important in this work is the amount of cobalt impregnated, since the next practical step in catalyst preparation would be reduction.…”

Section: Resultsmentioning

confidence: 99%

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XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

Cañón

Teplyakov

2021

Surface & Interface Analysis

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SiO2 and γ‐Al2O3 impregnation with nominal 10 and 20% of cobalt was examined using wet impregnation method starting with Co(NO3)2·6H2O. The samples were dried and analyzed by XPS prior to calcination to study the surface species in the solids and the role of the support in the processing of supported cobalt catalysts. The results showed that cobalt introduction alters the few top nanometers of the support materials as there are significant changes recorded in the XPS spectra. Most importantly, there is a remarkable similarity between the O 1s XPS signal of SiO2 and γ‐Al2O3 following Co 20% impregnation, which suggests that these materials could have similar properties in terms of the oxidation ability and the general redox behavior. The shift of Al 2p peaks to higher binding energy (BE) in the XPS investigations and the shift of Si 2p peaks to lower BE were observed for high nominal cobalt loading. These results suggest that the choice of the support in cobalt‐based catalysts would tune the chemical characteristics of cobalt in the final materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

Cañón

Teplyakov

2021

Surface & Interface Analysis

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“…The E g and A 1g are the Raman active modes; however, the other F 2g (194, 518, and 615 cm −1 ) are symmetric modes of vibrations. [ 32 ] It is clearly visible from vibration profile that the intensity of Raman peaks of Co 3 O 4 increases with deposition temperature, indicating the enhancement of layers crystallinity. That is in accordance with XRD outcomes.…”

Section: Resultsmentioning

confidence: 99%

The High Efficient Investigations of Properties of Co₃O₄ Nanostructured by Facile Spray Pyrolysis Technique for Future Gas Sensors Application

Doubi

Hartiti

Siadat

et al. 2023

Physica Rapid Research Ltrs

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Herein, the cobalt oxide thin films are elaborated by spray pyrolysis technique. The effect of temperature of substrates on several properties of cobalt oxide is studied. The thin layers are characterized by using X‐ray diffraction (XRD), Raman spectrometry (RS), and UV–vis spectrophotometer. The XRD analysis shows that Co3O4 thin layers have been formed along <111> preferential orientation. The RS displays the characteristic vibration modes of cobalt oxide phase, which confirms the formation of a single phase of spinel Co3O4 thin layers. The UV–vis spectrophotometer allows us to investigate the optical properties such as the absorbance, the transmittance, and the optical bandgap. The variation of electrical properties with the variation of temperature deposition confirms the high impact of the effect that study to make the cobalt oxide an important candidate for gas sensor devices.

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“…For this purpose, different production methods like solvothermal synthesis, chemical spray pyrolysis, chemical vapor deposition, sol-gel hydrothermal synthesis, simple precipitation, etc. were reported [14][15][16][17][18]. Hydrothermal synthesis could be used in the production of inorganic or organic/inorganic (hybrid) nanomaterials and/or nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Sonochemical Removal of Highly Toxic Aqueous Cd2+ and Cr6+ Ions Using Dandelion-like Co3O4 Nanoflowers

Berberoğlu

Koç

Yetim

et al. 2023

Open Journal of Nano

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In this work, cobalt(II/III) oxide (Co3O4) nano/microflowers were practically synthesized in laboratory conditions. Adsorbence properties of the nanoflowers were investigated for the removal of cadmium and chromium heavy metal ions. To assess the chemical and morphological characteristics of Co3O4 nanoflowers, Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), field emission electron microscopy (FESEM), Energy dispersive spectroscopy (EDS), and was used. To determine the adsorbence mechanism in detail, eluent concentration, eluent type, solution pH, adsorbent amount, solution volume, and adsorption duration were studied. In these assessments, flame atomic absorption spectroscopy (FAAS) was used. For Cr6+, adsorption optimum parameters were determined as 3M HNO3, pH 6.5, 150mg, 30mL, 60min. For Cd2+, optimum parameters were determined as 3M HNO3, pH 6.0, 100mg, 10mL, 30min. Co3O4, nanoflowers are eco-friendly adsorbent materials for the adsorption of Cd6+ and Cd2+ heavy metal ions since the production method is affordable and practical.

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Tailoring oxygen sensing characteristics of Co3O4 nanostructures through Gd doping

Cited by 33 publications

References 35 publications

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

The High Efficient Investigations of Properties of Co₃O₄ Nanostructured by Facile Spray Pyrolysis Technique for Future Gas Sensors Application

Sonochemical Removal of Highly Toxic Aqueous Cd2+ and Cr6+ Ions Using Dandelion-like Co3O4 Nanoflowers

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Tailoring oxygen sensing characteristics of Co3O4 nanostructures through Gd doping

Cited by 33 publications

References 35 publications

XPS characterization of cobalt impregnated SiO2 and γ‐Al2O3

XPS characterization of cobalt impregnated SiO2 and γ‐Al2O3

The High Efficient Investigations of Properties of Co3O4 Nanostructured by Facile Spray Pyrolysis Technique for Future Gas Sensors Application

Sonochemical Removal of Highly Toxic Aqueous Cd2+ and Cr6+ Ions Using Dandelion-like Co3O4 Nanoflowers

Contact Info

Product

Resources

About

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

The High Efficient Investigations of Properties of Co₃O₄ Nanostructured by Facile Spray Pyrolysis Technique for Future Gas Sensors Application