Switching-on superparamagnetism in diluted magnetic Fe(<scp>iii</scp>) doped CdSe quantum dots

Yadav, Amar Nath; Bindra, Jasleen K.; Jakhar, Narendra

doi:10.1039/c9ce01391a

Cited by 13 publications

(10 citation statements)

References 41 publications

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Section: Resultsmentioning

confidence: 88%

“…33 Additionally, the electron paramagnetic resonance (EPR) signal intensity of 20 mg-Fe@C/ C 3 N 4 -1100 also increased in comparison to that of 20 mg-Fe@ C/C 3 N 4 -900, implying that the Fe magnetic states had increased (Figure 3b). 34 To sum up, the 20 mg-Fe@C/ C 3 N 4 -1100 precatalyst displayed a transformation of Fe microstructure and exhibited excellent magnetism. 29 To evaluate the CO 2 reduction reaction activity of 20 mg-Fe@C/C 3 N 4 -1100, linear sweep voltammetry (LSV) measurements of a well-prepared catalyst/carbon paper was conducted with N 2 -or CO 2 -saturated 0.1 M KHCO 3 electrolytes from Thus, it can be seen expressly that the prepared electrode was active for CO 2 reduction.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

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Facile Synthesis of Fe@C Loaded on g-C₃N₄ for CO₂ Electrochemical Reduction to CO with Low Overpotential

Zhang

Zhu

et al. 2022

ACS Omega

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Electrochemical CO 2 reduction has been acknowledged as a hopeful tactic to alleviate environmental and global energy crises. Herein, we designed an Fe@C/g-C 3 N 4 heterogeneous nanocomposite material by a simple one-pot method, which we applied to the electrocatalytic CO 2 reduction reaction (ECR). Our optimized 20 mg-Fe@C/g-C 3 N 4 -1100 catalyst displays excellent performance for the ECR and a maximum Faradaic efficiency (FE) of 88% with a low overpotential of −0.38 V vs. RHE. The Tafel slope reveals that the first electron transfer, which involves a surface-adsorbed *COOH intermediate, is the rate-determining step for 20 mg-Fe@C/C 3 N 4 -1100 during the ECR. More precisely, the coordinating capability of the g-C 3 N 4 framework and Fe@C species as a highly active site promote the intermediate product transmission. These results indicate that the combination of temperature adjustment and precursor optimization is key to facilitating the ECR of an iron-based catalyst.

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Section: Resultsmentioning

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 88%

Facile Synthesis of Fe@C Loaded on g-C₃N₄ for CO₂ Electrochemical Reduction to CO with Low Overpotential

Zhang

Zhu

et al. 2022

ACS Omega

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“…It reveals that the rGO nanosheet has a non-magnetic response, as expected. On the other hand, Co NPs depict superparamagnetic behavior (minimal coercivity, H C 115 Oe) [22,23]. This behavior observed due to the smaller size of Co NPs (below 20 nm) [24].…”

Section: Resultsmentioning

confidence: 99%

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

2020

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Control over the magnetic interactions in magnetic nanoparticles (MNPs) is a crucial issue to the future development of nanometer-sized integrated "spintronic" applications. Here, we have developed a nanohybrid structure to achieve room temperature ferromagnetism, via a facile, effective, and reproducible solvothermal synthesis method. The plan has been put onto cobalt (Co) NPs, where the growth of Co NPs on the surface of reduced graphene oxide (rGO) nanosheets switches the magnetic interactions from superparamagnetic to ferromagnetic at room temperature. Switching-on ferromagnetism in this nanohybrid may be due to the hybridization between unsaturated 2p z orbitals of graphene and 3d orbitals of Co, which promotes ferromagnetic long-range ordering. The ferromagnetic behavior of Co-rGO nanohybrid makes it excellent material in the field of spintronics, catalysis, and magnetic resonance imaging.

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“…The experimental results indicated that 0.02 g of ammonium ferric citrate yielded CDs with the best catalytic effect. Compared with reported procedures for the preparation of CD Fe ( Supplementary Table S1 ) ( Faraji et al, 2018 ; Yue et al, 2019 ; Zhang et al, 2019 ; Yadav et al, 2020 ), our procedure is simpler and requires a shorter hydrothermal reaction time. In addition, only one reagent, ammonium ferric citrate, was used to prepare CD FeN .…”

Section: Methodsmentioning

confidence: 99%

Aptamer Turn-On SERS/RRS/Fluorescence Tri-mode Platform for Ultra-trace Urea Determination Using Fe/N-Doped Carbon Dots

Liang

et al. 2021

Front. Chem.

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Sensitive and selective methods for the determination of urea in samples such as dairy products are important for quality control and health applications. Using ammonium ferric citrate as a precursor, Fe/N-codoped carbon dots (CDFeN) were prepared by a hydrothermal procedure and characterized in detail. CDFeN strongly catalyzes the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H2O2 to turn on an indicator molecular reaction, forming an oxidized tetramethylbenzidine (TMBox) probe with surface-enhanced Raman scattering, resonance Rayleigh scattering, and fluorescence (SERS, RRS, and FL) signals at 1,598 cm−1, 370 nm, and 405 nm, respectively. The urea aptamer (Apt) can turn off the indicator reaction to reduce the tri-signals, and the addition of urea turns on the indicator reaction to linearly enhance the SERS/RRS/FL intensity. Thus, a novel Apt turn-on tri-mode method was developed for the assay determination of ultra-trace urea with high sensitivity, good selectivity, and accuracy. Trace adenosine triphosphate and estradiol can also be determined by the Apt-CDFeN catalytic analytical platform.

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Switching-on superparamagnetism in diluted magnetic Fe(iii) doped CdSe quantum dots

Abstract: Chemically prepared, 0.5% Fe(iii)-doped CdSe QDs exhibit superparamagnetism with weak ferromagnetic exchange interaction.

Cited by 13 publications

References 41 publications

Facile Synthesis of Fe@C Loaded on g-C₃N₄ for CO₂ Electrochemical Reduction to CO with Low Overpotential

Facile Synthesis of Fe@C Loaded on g-C₃N₄ for CO₂ Electrochemical Reduction to CO with Low Overpotential

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

Aptamer Turn-On SERS/RRS/Fluorescence Tri-mode Platform for Ultra-trace Urea Determination Using Fe/N-Doped Carbon Dots

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Switching-on superparamagnetism in diluted magnetic Fe(iii) doped CdSe quantum dots

Abstract: Chemically prepared, 0.5% Fe(iii)-doped CdSe QDs exhibit superparamagnetism with weak ferromagnetic exchange interaction.

Cited by 13 publications

References 41 publications

Facile Synthesis of Fe@C Loaded on g-C3N4 for CO2 Electrochemical Reduction to CO with Low Overpotential

Facile Synthesis of Fe@C Loaded on g-C3N4 for CO2 Electrochemical Reduction to CO with Low Overpotential

Graphene-Induced Room Temperature Ferromagnetism in Cobalt Nanoparticles Decorated Graphene Nanohybrid

Aptamer Turn-On SERS/RRS/Fluorescence Tri-mode Platform for Ultra-trace Urea Determination Using Fe/N-Doped Carbon Dots

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Product

Resources

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Facile Synthesis of Fe@C Loaded on g-C₃N₄ for CO₂ Electrochemical Reduction to CO with Low Overpotential

Facile Synthesis of Fe@C Loaded on g-C₃N₄ for CO₂ Electrochemical Reduction to CO with Low Overpotential