Effect of Fe doping concentration on photocatalytic activity of ZnO nanosheets under natural sunlight

Khokhra, Richa; Kumar, Rajesh

doi:10.1063/1.4915405

Cited by 2 publications

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“…Recently, doping of foreign elements into semiconductors is an effective strategy to tune the electronic structures and magnetic properties. − Typically, 2D g-ZnO nanosheets exhibit a nonmagnetic–antiferromagnetic–ferromagnetic transition by doping nonmetal atoms . An et al have investigated the properties of SnS 2 nanosheets doped with Cu, which indicates that the visible-light photocatalytic activity is much higher than pristine SnS 2 nanosheets.…”

Section: Introductionmentioning

confidence: 99%

“…21 An et al 25 have investigated the properties of SnS 2 nanosheets doped with Cu, which indicates that the visible-light photocatalytic activity is much higher than pristine SnS 2 nanosheets. Later on, Khokhra and co-workers 27 have synthesized Fe-doped g-ZnO nanosheets and observed that the ZnO monolayer nanosheets with low dopant concentration exhibit excellent photocatalytic activity in degradation of organic pollutants. However, monodoping usually introduces partially unoccupied donor states or acceptor states, which accelerates the electron−hole recombination process.…”

Section: ■ Introductionmentioning

confidence: 99%

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Bandgap Engineering of the g-ZnO Nanosheet via Cationic–Anionic Passivated Codoping for Visible-Light-Driven Photocatalysis

et al. 2017

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The graphene-like ZnO (g-ZnO) nanosheets were synthesized and shown to exhibit highly photocatalytic activity for the degradation of RhB under ultraviolet irradiation. In this work, we utilize cationic–anionic passivated codoping to explore the potential of the g-ZnO nanosheet for the design of efficient water redox photocatalysts by employing density functional theory calculations with the hybrid HSE06 functional. Our calculations show that anion–cation passivated codoped systems not only are more favorable than the corresponding monodoping in the g-ZnO nanosheet due to the Coulomb interactions but also effectively reduce the band gap without introducing unoccupied states which accelerate the electron–hole recombination. The charge-compensated P–Sc and C–Zr codoped g-ZnO nanosheets are energetically favorable for hydrogen evolution but not insufficient to produce oxygen, indicating that they could serve as Z-scheme photocatalysts. The C–Ti, N–Y, and P–Y codoped systems may be potential potocatalysts for photoelectrochemical water splitting to generate hydrogen due to their appropriate band gaps and band edge positions. In particular, the charge-compensated P–Y codoped g-ZnO nanosheet has the most excellent stability and the largest absorption region of visible light among these codoped systems. Further, we show that P–Y passivated codoping can reduce the overpotentials for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) of the g-ZnO nanosheet, indicating that the OER or HER on the P–Y codoped g-ZnO nanosheet can be easier driven by the irradiation-generated holes or electrons.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Bandgap Engineering of the g-ZnO Nanosheet via Cationic–Anionic Passivated Codoping for Visible-Light-Driven Photocatalysis

et al. 2017

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“…The white-colored residue was washed multiple times with DI water and ethanol. Later, the obtained product was calcined at 500 °C in a muffle furnace for 3 h [18]. The possible reactions are given below ( ) ( ) ( )…”

Section: Synthesis Of Zno Nanoparticlesmentioning

confidence: 99%

ZnO nanoparticles-copper metal-organic framework composite on 3D porous nickel foam: a novel electrochemical sensing platform to detect serotonin in blood serum

Mukundan,

Ganapathy,

Badhulika

2023

Nanotechnology

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Herein, we report a simple non-enzymatic electrochemical sensor for the detection of serotonin (5-HT) in blood serum using ZnO oxide nanoparticles-Copper metal-organic framework (MOF) composite on 3D porous nickel foam, namely, ZnO-Cu MOF/NF. The XRD analysis reveals the crystalline nature of synthesized Cu MOF and Wurtzite structure of ZnO nanoparticles, whereas SEM characterization confirms the high surface area of the composite nanostructures. Differential pulse voltammetry (DPV) analysis under optimal conditions yields a wide linear detection range of 1 ng/ml to 1 mg/ml to 5-HT concentrations and a LOD (signal to noise ratio = 3.3) of 0.49 ng/ml, which is well below the lowest physiological concentration of 5-HT. The sensitivity of the fabricated sensor is found to be 0.0606 mA/ng mL-1.cm2 , and it exhibited remarkable selectivity towards serotonin in the presence of various interferants, including dopamine and AA, which coexists in the real biological matrix. Further, successful determination of 5-HT is achieved in the simulated blood serum sample with a good recovery percentage from ~102.5 to ~99.25%. The synergistic combination of the excellent electrocatalytic properties and surface area of the constituent nanomaterials proves the overall efficacy of this novel platform shows immense potential to be used in developing versatile electrochemical sensors.

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Effect of Fe doping concentration on photocatalytic activity of ZnO nanosheets under natural sunlight

Cited by 2 publications

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Bandgap Engineering of the g-ZnO Nanosheet via Cationic–Anionic Passivated Codoping for Visible-Light-Driven Photocatalysis

Bandgap Engineering of the g-ZnO Nanosheet via Cationic–Anionic Passivated Codoping for Visible-Light-Driven Photocatalysis

ZnO nanoparticles-copper metal-organic framework composite on 3D porous nickel foam: a novel electrochemical sensing platform to detect serotonin in blood serum

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