Effect of Fe and Co doping on ethanol sensing property of powder-based ZnO nanostructures prepared by sol–gel method

Khatibani, A. Bagheri; Abbasi, Mahnaz

doi:10.1007/s10971-018-4629-7

Cited by 34 publications

(15 citation statements)

References 46 publications

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“…According to diffraction spectra, there is no impurity peak indicating the formation of the pure phase of ZnO. 21) A comparison between the pure zinc oxide with the graphene doped ZnO reveals the evidence of graphene, which is marked by a grey arrow. The four magnified views of XRD data in different regions are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…It may be ascribed to the lattice instability and iconicity. 21) Other factors including the variation of bond length and angle, and different defects in the main structure may be also effective. The strain ε s of the samples are also calculated and given in Table I.…”

Section: Resultsmentioning

confidence: 99%

“…28,29) These peaks indicate the defect states within the main structure, which can be attractive for specific applications such as gas sensing. 21) Based on the literature, the vibration peaks of most metal oxides present between 400 and 700 cm −1 . 24) Therefore, an enlarged view of FTIR analysis within 450-750 cm −1 has been plotted [Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The sensing property of the samples has been determined by the measurement of the voltage variations of the variable resistor due to the adsorption/desorption of oxygen on the surface of the samples. 21) For reducing gases (e.g. ethanol), the sensing mechanism can be explained in two steps: (1) the interaction between ambient oxygen and the surface of the samples and (2) the reaction between ethanol vapor and the surface of the samples.…”

Section: Resultsmentioning

confidence: 99%

“…The 10 wt% Co/ZnO sample showed an acceptable status compared to pure zinc oxide for ethanol sensing, since the reduction of working temperature (from 275 °C to 220 °C), response/recovery times (from 18/96 s to 5/27 s) and enhancing of sensitivity (from ∼31 to ∼39). 21) Zhang et al have been synthesized pure and ZnO/graphene samples via the hydrothermal method. It was reported that the response of the ZnO towards acetone was improved by graphene doping (from ∼8 to ∼13).…”

Section: Introductionmentioning

confidence: 99%

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The effect of graphene and cobalt on ethanol sensing performance of ZnO based sensor prepared by sol-gel method

Nejatinia¹,

Charvadeh²,

Khatibani³

2021

Jpn. J. Appl. Phys.

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The sol gel method was used to synthesize pure zinc oxide, graphene doped zinc oxide, cobalt doped zinc oxide and graphene/cobalt doped zinc oxide samples to investigate their sensing properties. Different physical properties of the samples have been investigated and compared through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FTIR). Using the XRD results, the lattice parameter increased with doping of the samples. Based on the analyses, the formation of zinc oxide in all samples and the related signs of graphene and cobalt were approved. By the aid of an electric circuit, all of the samples were exposed to different concentrations of ethanol. The best response/recovery time was reported for all samples at 3000 ppm. Doping of the samples had a significant effect on reducing the response/recovery time and increasing the sensitivity, which is a significant case for semiconductor gas sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of graphene and cobalt on ethanol sensing performance of ZnO based sensor prepared by sol-gel method

Nejatinia¹,

Charvadeh²,

Khatibani³

2021

Jpn. J. Appl. Phys.

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Tailoring Bandgap and Photocatalytic Performance of Designed Zinc Oxide Platelets by Cobalt Doping

Alkan,

Sukru Ates,

Tumerkan Kesim

et al. 2024

Eur J Inorg Chem

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Platelet‐shaped zinc oxide (ZnO) particles exhibit certain advantages compared to conventional micron and nano forms. Their superior surface coverage and excellent optical properties make these particles very attractive as UV filters in cosmetics and personal care applications. Although ZnO is non‐toxic, it exhibits photocatalytic activity (PCA), which increases when the size of particles approaches the nanoscale. High PCA of mineral/inorganic filters is not desired in cosmetics and personal care applications. Therefore, it is essential to develop strategies to reduce PCA of such materials under UV exposure. Accordingly, the research objective of this study is to develop an understanding of the effects of Co‐doping on the optoelectronic and crystal structure of platelet shaped ZnO particles with Zn1‐xMxO stoichiometry (x=0‐4wt% cobalt). XRD‐based Rietveld refinement and WD‐XRF reveal that Co was successfully doped into the ZnO lattice. SEM and particle size analyses confirmed that the shape and size of the designed ZnO platelets did not change significantly after doping. ~85% reduction in PCA has was achieved by 3wt% Co doping which was attributed to reduced OH and O2 free radical concentration. These results clearly show that Co‐doping can be used to effectively tailor the bandgap and optical properties of the designed ZnO.

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Surfactant‐Free Sol–Gel Synthesis Method for the Preparation of Mesoporous High Surface Area NiO–Al₂O₃ Nanopowder and Its Application in Catalytic CO₂ Methanation

2019

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A group of nickel‐based catalysts with different weight percentages of Ni are synthesized using a novel surfactant‐free sol–gel method, and the prepared catalysts are used in the methanation of carbon dioxide. The results indicate that the surfactant‐free sol–gel method is highly effective to prepare nickel‐based catalysts with high Brunauer–Emmett–Teller (BET) area in the range of 269.2–297.3 m2 g−1. The increment in nickel content from 15 to 30 wt% increases the size of the Ni crystals from 3.7 to 4.2 nm, weakens the interaction between nickel oxide and alumina, and improves the reducibility of the catalysts. The catalyst with 30 wt% Ni possesses the best catalytic performance in CO2 methanation reaction with 73.98% CO2 conversion and 99% CH4 selectivity at 350 °C. High catalytic stability is also observed for these catalysts.

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Effect of Fe and Co doping on ethanol sensing property of powder-based ZnO nanostructures prepared by sol–gel method

Cited by 34 publications

References 46 publications

The effect of graphene and cobalt on ethanol sensing performance of ZnO based sensor prepared by sol-gel method

The effect of graphene and cobalt on ethanol sensing performance of ZnO based sensor prepared by sol-gel method

Tailoring Bandgap and Photocatalytic Performance of Designed Zinc Oxide Platelets by Cobalt Doping

Surfactant‐Free Sol–Gel Synthesis Method for the Preparation of Mesoporous High Surface Area NiO–Al₂O₃ Nanopowder and Its Application in Catalytic CO₂ Methanation

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Effect of Fe and Co doping on ethanol sensing property of powder-based ZnO nanostructures prepared by sol–gel method

Cited by 34 publications

References 46 publications

The effect of graphene and cobalt on ethanol sensing performance of ZnO based sensor prepared by sol-gel method

The effect of graphene and cobalt on ethanol sensing performance of ZnO based sensor prepared by sol-gel method

Tailoring Bandgap and Photocatalytic Performance of Designed Zinc Oxide Platelets by Cobalt Doping

Surfactant‐Free Sol–Gel Synthesis Method for the Preparation of Mesoporous High Surface Area NiO–Al2O3 Nanopowder and Its Application in Catalytic CO2 Methanation

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Surfactant‐Free Sol–Gel Synthesis Method for the Preparation of Mesoporous High Surface Area NiO–Al₂O₃ Nanopowder and Its Application in Catalytic CO₂ Methanation