Fe 2p Research Articles

High thermostability in CoFeB/MgO/Ta multilayers by {Pt(t)/Ta(t)}n superlattice buffer layers

Ta/CoFeB/MgO/Ta multilayer known as the fundamental building block for magnetic tunneling junctions, has been studied for decades. However, its thermostability is normally less than 300 °C, which cannot meet the requirements for subsequent semiconductor processes. In this study, buffer layers of {Pt(t)/Ta(t)}n superlattices were introduced into CoFeB/MgO/Ta multilayers grown by magnetron sputtering. The growth period n and the single layer thickness t in the superlattice have been systematically explored. And it is found that the sample can maintain distinct perpendicular magnetic anisotropy (PMA) even after a 440 °C post-annealing treatment at n = 3 and t = 1.5 nm. This has been attributed to that the superlattice buffer layer might serve as a diffusion barrier, reducing Ta atoms from diffusing into the CoFeB/MgO interface. Less Ta at the interface results more FeOx formed and enhances the hybridization of Fe 2p and O 3d orbitals which increases the thermostability of PMA. This suggests that superlattice buffer layer provides a new approach to improve the materials’ thermostability.

Co–Fe–oxide nanoparticles supported on the various highly dispersed matrices: the effect of the carrier on structural and magnetic properties

sA series of mixed oxides was synthesized by deposition of the guest phase on the highly dispersed oxide matrix. Fumed nanooxides SiO2, Al2O3, SiO2/Al2O3, and SiO2/Al2O3/TiO2 with the specific surface area of 65–91 m2/g were selected as highly dispersed matrices. Co–Fe mixed oxides with the general formula Co4xFexOy (Co: Fe = 4: 1) were deposited as the guest oxides using the two-step method: (i) solvate-stimulated modification of the surface of fumed nanocarriers with the mixture of cobalt nitrate (II) and iron (III) formate and (ii) subsequent heat treatment up to 600 °C to form Co4xFexOy. The aim of this paper was to study the influence of the composition and structure of fumed oxide matrices and deposited guest phase on the morphology of the resulting composites in the gaseous and aqueous media using the XRD, XPS, FTIR, nitrogen adsorption and SEM/EDX, as well as quasi-elastic light scattering (QELS) methods. The low-temperature nitrogen adsorption isotherms have a sigmoidal shape with a narrow hysteresis loop characteristic of mesoporous materials. The specific surface area (SBET) of the composites varies from 48 to 82 m2/g, showing a tendency towards a decrease in the SBET values by 10–26% in comparison with the initial nanocarriers. The SEM data show the denser aggregate structure of nanocomposites compared to the initial carriers. The primary particle size was in the 30–60 nm range and the EDX data confirm the formation of a guest phase on the mixed aluminosilicate carriers, mainly in the surface patches corresponding to the alumina structure. According to the QELS data, there is a tendency to form aggregates of 100–10 μm in size in the aqueous media. The XRD method shows that the deposited metal oxides are in the form of crystalline phases of Co3O4 with the crystallites of 25–26 nm in size for the individual SiO2 and Al2O3 nanocarriers and 34–37 for the mixed ones, but the iron oxide reflections were not identified for the composites. XPS observation demonstrates the signal of Fe 2p electrons as the form of Fe2O3 oxide in the surface layer of nanocomposites as well as Co 2p as the Co3O4 and Co(OH)2.

X-ray Photoelectron characterization of the chemical states and the natural oxidation behavior of TiC ceramics reinforced steel matrix composite after stabilizing heat treatments

In the present work, the microstructure and chemical behavior of TiC ceramic reinforced steel matrix composite material after stabilizing heat treatments have been studied. The composition of the naturally formed oxide layer on the surface of the composite and the potential natural oxidation mechanisms are also elucidated. The results showed that the naturally formed oxide layer contained mainly O, C, Fe and Ti, with small amounts of Cr and Mo. In the multi-metallic oxide layer, Fe3+, Mo6+, and Ti4+ species are enriched on the free external surface of the composite, the protective Fe2+ oxides were distributed in the relative inner part of the oxide layer, and Mo4+ was more uniformly distributed throughout the natural oxide film. The Cr oxides formed near the substrate acted as a diffusion barrier for iron and chromium ions, and the preferential oxidation of chromium formed a passivation film, which effectively improved the corrosion resistance of the material. Due to the interfacial evolution and complex stress changes in the composite during the stabilizing heat treatments, the XPS spectral peaks were shifted towards lower binding energies than in the annealed sample. The core level spectra of Mo 3d, Ti 2p, and Fe 2p were all shifted to lower binding energies due to the combination of ligand and strain effects after quenching, and there was no significant difference in the spectra of the tempered and thermal cooling cycling (TCC) treated composites, which suggested that the chemical state was relatively stable during the subsequent stabilizing heat treatments.

Principal Component Analysis (PCA) unravels spectral components present in XPS spectra of complex oxide films on iron foil

Principal component analysis (PCA), as applied to the processing of the complex X-ray photoelectron spectroscopy (XPS) lineshapes, is discussed. PCA analysis example is provided of complex native iron oxide films on Fe foil XPS spectra further modified by argon and helium ion beams. Abstract PCA components are derived from Fe 2p, O 1 s and C 1 s regions leading to the assignments of surface (oxy)hydroxide, Fe2O3, FeO and Fe metal, as corroborated by the corresponding elemental quantification profiles. Detailed mathematical concepts behind PCA analysis of spectra data are provided.

High-energy x-ray photoelectron spectroscopy Cr Kα measurement of bulk iron

Iron was analyzed using high-resolution high-energy x-ray photoelectron Spectroscopy (HAXPES). The HAXPES spectra of iron obtained using monochromatic Cr Kα radiation at 5414.8 eV include survey scan and high-resolution spectra of Fe 2s, Fe 2p, Fe 3s, and Fe 3p.

Evidence of oxygen evolution over sputtered zinc ferrite (ZnFe2O4) thin film by enhanced lattice oxygen participation

We report evidence of oxygen evolution over zinc ferrite (ZnFe2O4) thin films grown on indium tin oxide and quartz substrates using the RF sputtering. The thin films are deposited at ambient temperature with different argon/oxygen gas ratios, specifically 1:0 (Z–Ar), 1:1 (Z–Ar:O), and 0:1 (Z–O). Structural characterization using grazing incidence x-ray diffraction at a 0.400° grazing angle confirmed the polycrystalline nature of the films. X-ray photoelectron spectroscopy scans of Zn 2p, Fe 2p, and O1s were conducted to investigate the lattice oxygen vacancies. The lattice oxygen vacancies in the Z–Ar film resulted in a lower bandgap of 2.05 eV than the Z–O film of 2.36 eV. The oxygen evolution reaction (OER) performances of the thin films are investigated to understand the effect of oxygen vacancies on electrochemical activity and observed that the Z–Ar film, with oxygen vacancies, exhibits a decrease in overpotential by ∼12.5% at 10 mA cm−2, eightfold increase in current density at 520 mV overpotential deduced from linear sweep voltammetry, and a 71.9% increase in donor density inferred from the Mott–Schottky plot, as compared to the Z–O film. The findings suggest that the Z–Ar film follows a “lattice oxygen participation mechanism” for the OER, instead of an “adsorbate evolution mechanism” observed in the Z–O film. The results highlight the significant impact of argon/oxygen gas ratios on the structural, optical, and electrochemical properties of zinc ferrite thin films and provide insight into the role of oxygen vacancies in modulating the OER performance for potential applications.

Fe-MFI zeolite-encapsulated copper oxide with excellent re-usability for efficient tetracycline degradation

Impregnation handlement can load highly dispersed CuO nanoparticles on the Fe-MFI zeolite and effectively enhances its catalytic activity in the tetracycline degradation reactions, but encounters serious re-usability problems. In this work, Fe-MFI zeolite-encapsulated copper oxide CuO@Fe-MFI was prepared via one-step hydrothermal synthesis and utilized as heterogeneous catalyst for the removal of tetracycline. The obtained 2CuO@1Fe-MFI zeolite presented a external surface area of 270 m2/g, which was almost 5.5 folds of 2CuO/1Fe-MFI zeolite obtained by impregnation handlement. In addition, there may be a near-neighbor effect between encapsulated CuO and framework iron evidenced by the shifts of UV–Vis absorption bands as well as binding energies for Fe 2p and Cu 2p. At pH = 7.0, 2CuO@1Fe-MFI zeolite attained the largest tetracycline removal rate of 99.6% within 20 min at experimental conditions: [TCE] = 50 mg/L, [Catalyst] = 0.5 g/L, [PMS] = 1.0 g/L, 323 K, and the biggest degradation rate constant of 2.42 min−1, which was almost 11.1 folds of that for 2CuO/1Fe-MFI zeolite. The large external surface area and near-neighbor effect together gave rise to the excellent tetracycline degradation performance for 2CuO@1Fe-MFI zeolite. On the same time, the obtained 2CuO@1Fe-MFI zeolite can be reused for more than five times. Quenching experiments and EPR characterizations demonstrated the reactive species for tetracycline removal over 2CuO@1Fe-MFI zeolite were •OH, SO4•−, •O2− and 1O2 species, and moreover 1O2 served as the major active species. Furthermore, possible tetracycline degradation pathways over 2CuO@1Fe-MFI zeolite were proposed.

UV Light‐Assisted Photodegradation of Industrial Dyes by Reduced Graphene Oxide/Nickel Codoped Fe3O4 Nanocomposites Synthesized Using the Coprecipitation Method

Industrial dye waste is highly toxic, nonbiodegradable, and has a significant negative impact on the environment. Photodegradation of phenothiazine derivative dyes by undoped Fe3O4 nanoparticles (Fe3O4), reduced graphene oxide (rGO)‐doped Fe3O4 nanocomposites (G@Fe3O4), nickel‐doped Fe3O4 nanoparticles (Ni@Fe3O4), and graphene–nickel codoped Fe3O4 nanocomposites (Ni/G@Fe3O4) is achieved using a facile coprecipitation technique. The X‐ray powder diffraction patterns of all the prepared samples confirm the face‐centered cubic structure of metallic Fe3O4. The crystallite size of the Ni‐doped samples increases, indicating that the addition of Ni2+ significantly increases the crystalline grain growth of Fe3O4, whereas the addition of graphene dopants results in a decrease in the particle size and an increase in the bandgap. The higher specific surface area of Ni/G@Fe3O4 (70.082 m2 g−1) is attributed to the introduction of rGO nanoflakes and the formation of secondary pores. The X‐ray photoelectron spectra of O 1s, C 1s, Ni 2p, and Fe 2p confirm the presence of oxygen anions, graphene, Ni2+ ions, and Fe3+ and Fe2+ oxidation states in the Fe3O4 lattice.

Observation of Raman components in resonant X-ray emission spectra of Fe cyanide

There were two theoretical calculations to reproduce the Fe 2p absorption spectrum of hexacyanoferrate [R. K. Hocking et al., J. Am. Chem. Soc. 128 (2006) 10442, and Y. Nanba and K. Okada: J. Phys. Soc. Jpn. 79 (2010) 114722], but there was a big difference in the parameters used in both. To confirm which of the theoretical calculations is more suitable, we have carried out the experiments of the resonant X-ray emission spectroscopy (RXES) around the Fe Kβ emission lines for K4Fe(CN)6 and K3Fe(CN)6, in order to acquire the electronic structure of Fe atom as a model compound of hexacyanoferrate. In the RXES results of K4Fe(CN)6, three Raman scattering peaks are observed at 6.5, 9.5, and 15.4 eV near the elastic peak, respectively, called Raman Peak (RP) 1, RP2, and RP3. By comparing theoretical calculations of Raman scattering peaks of hexacyanoferrate [Y. Nanba: Doctoral Thesis, Okayama University, 2012 (in Japanese)], the Raman shift energies of RP1 were close to those of the metal-to-ligand charge transfer (MLCT). On the other hand, the Raman shift energies of RP3 were close to those of the ligand-to-metal charge transfer (LMCT). A similar result was also obtained in those of K3Fe(CN)6. It was found that the features of the MLCT excitation and the LMCT one were observed using the RXES experiments.

Investigation of iron oxide shell and iron core in magnetically-assisted synthetized wire-like nanochains

The zerovalent iron (Fe0) nanomaterials tend to be spontaneously oxidized in the presence of oxygen. This leads to the formation of interface composed of iron core and thin iron oxide shell. These structures are frequently observed with transmission electron microscope but, at the same time, it is hard to determine the precise structural and chemical composition of oxide shell. This feature is very important for possible applications of Fe0 nanostructures. Hence, the present work aims to deliver more detailed insights in this topic. The investigations are performed for the iron nanochains prepared in the magnetic-field-induce reduction of FeCl3 by NaBH4. The high-resolution transmission electron microscopy, electron energy loss spectroscopy, and x-ray photoemission spectroscopy confirm that the iron nanochains are covered by very thin oxide layer not exceeding over 3 nm. Moreover, the detailed XPS analyses of O 1s and Fe 2p lines indicate that the iron oxide shell reveals Fe3O4 nature. Moreover, this work demonstrated that some by-products of the reaction containing boron are presented in the sample even after a removal of the thin iron oxide shell by Ar+ treatment.

Soft X-ray spectro-ptychography of boron nitride nanobamboos, carbon nanotubes and permalloy nanorods.

Spectro-ptychography offers improved spatial resolution and additional phase spectral information relative to that provided by scanning transmission X-ray microscopes. However, carrying out ptychography at the lower range of soft X-ray energies (e.g. below 200 eV to 600 eV) on samples with weakly scattering signals can be challenging. Here, results of soft X-ray spectro-ptychography at energies as low as 180 eV are presented, and its capabilities are illustrated with results from permalloy nanorods (Fe 2p), carbon nanotubes (C 1s) and boron nitride bamboo nanostructures (B 1s, N 1s). The optimization of low-energy X-ray spectro-ptychography is described and important challenges associated with measurement approaches, reconstruction algorithms and their effects on the reconstructed images are discussed. A method for evaluating the increase in radiation dose when using overlapping sampling is presented.

Efficient separation and recovery process of Pd(II) based on sintering-leaching method by silica-based aluminum hexacyanoferrate

In the present work, several hexacyanoferrates (K2CoFe(CN)6, KAlFe(CN)6 and K2NiFe(CN)6) were theoretically analyzed based on density functional theory (DFT). Their stable structures and adsorption capabilities were compared. A silica-based hexacyanoferrate (KAlFe(CN)6/SiO2) was selected and synthesized for Pd(II) separation and recovery process. Its estimated mode particle size was 67 μm, and its average crystal size was 18.8 nm. The Fe 2p and Pd 3 d X-ray photo-electron spectra (XPS) of Pd-loaded KAlFe(CN)6/SiO2 and density functional theory calculation revealed that the adsorption mechanism is the spontaneous displacement of K+ by Pd2+. A novel sintering-leaching method was developed for the recovery of Pd(II) from spent adsorbent. The effects of different sintering times, leaching temperatures, and leaching media were investigated, indicating that the optimal condition (sintering at 400 °C for 24 h, leaching in 3 M HCl at 50 °C) could reach a Pd(II) recover ratio of 88%. Energy-dispersive spectroscopy (EDS) and XPS tests were performed on the leaching product, and the results confirmed that the recovered product was PdO with purity of 91.8%.

Processing and Physicochemical Properties of Magnetite Nanoparticles Coated with Curcuma longa L. Extract.

In this work, Curcuma longa L. extract has been used in the synthesis and direct coating of magnetite (Fe3O4) nanoparticles ~12 nm, providing a surface layer of polyphenol groups (-OH and -COOH). This contributes to the development of nanocarriers and triggers different bio-applications. Curcuma longa L. is part of the ginger family (Zingiberaceae); the extracts of this plant contain a polyphenol structure compound, and it has an affinity to be linked to Fe ions. The nanoparticles' magnetization obtained corresponded to close hysteresis loop Ms = 8.81 emu/g, coercive field Hc = 26.67 Oe, and low remanence energy as iron oxide superparamagnetic nanoparticles (SPIONs). Furthermore, the synthesized nanoparticles (G-M@T) showed tunable single magnetic domain interactions with uniaxial anisotropy as addressable cores at 90-180°. Surface analysis revealed characteristic peaks of Fe 2p, O 1s, and C 1s. From the last one, it was possible to obtain the C-O, C=O, -OH bonds, achieving an acceptable connection with the HepG2 cell line. The G-M@T nanoparticles do not induce cell toxicity in human peripheral blood mononuclear cells or HepG2 cells in vitro, but they can increase the mitochondrial and lysosomal activity in HepG2 cells, probably related to an apoptotic cell death induction or to a stress response due to the high concentration of iron within the cell.

Magnetic ionic liquid 1-ethyl-3-methylimidazolium tetrachloroferrate characterized by XPS

The XPS spectra of ionic liquid 1-ethyl-3-methylimidazolium tetrachloroferrate (EmimFeCl4) were collected with Al Kα x-radiation, and the result provides a valence band spectrum in addition to the core Fe 2p, Cl 2p, and C 1s spectra.

Oxalated zero valent iron enables highly efficient heterogeneous Fenton reaction by self-adapting pH and accelerating proton cycle

Heterogeneous Fenton reactions of zero-valent iron (ZVI) requires the sufficient release of Fe(II) to catalyze the H2O2 decomposition. However, the rate-limiting step of proton transfer through the passivation layer of ZVI restricted the Fe(II) release via Fe0 core corrosion. Herein we modified the shell of ZVI with highly proton-conductive FeC2O4·2H2O by ball-milling (OA-ZVIbm), and demonstrated its high heterogeneous Fenton performance of thiamphenicol (TAP) removal, with 500 times enhancement of the rate constant. More importantly, the OA-ZVIbm/H2O2 showed little attenuation of the Fenton activity during 13 successive cycles, and was applicable across a wide pH range of 3.5–9.5. Interestingly, the OA-ZVIbm/H2O2 reaction showed pH self-adapting ability, which initially reduced and then sustained the solution pH in the range of 3.5–5.2. The abundant intrinsic surface Fe(II) of OA-ZVIbm (45.54% vs. 27.52% in ZVIbm, according to Fe 2p XPS profiles) was oxidized by H2O2 and hydrolyzed to generate protons, and the FeC2O4·2H2O shell favored the fast transfer of protons to inner Fe0, therefore, the consumption-regeneration cycle of protons were accelerated to drove the production of Fe(II) for Fenton reactions, demonstrated by the more prominent H2 evolution and nearly 100% H2O2 decomposition by OA-ZVIbm. Furthermore, the FeC2O4·2H2O shell was stable and slightly decreased from 1.9% to 1.7% after the Fenton reaction. This study clarified the significance of proton transfer on the reactivity of ZVI, and provided an efficient strategy to achieve the highly efficient and robust heterogeneous Fenton reaction of ZVI for pollution control.

Synergistic influence of SnFe2O4 on ZnSnO3 hybrid nanostructures and optimizations optical, photoluminescence, and magnetic properties for multifunction application

The synergistic influence of SnFe2O4on ZnSnO3 with different weight ratios has been synthesized by hydrothermal and solvothermal techniques. The composition, structure, morphology, optical, luminescence, and magnetic properties have been studied in this work. The XPS results signal a strong fundamental interaction among ZnSnO3 and SnFe2O4, as evidenced bythe relocation of the peak positions of Zn 2p, OII, Fe 2p, and Sn 3d. The crystallite size of hybrid nanostructures has decreased from 28 nm to 12 nm. The prepared pristine samples have a nanocube and nanospike-like morphology for ZnSnO3 and SnFe2O4, whereas the hybrid nanostructure morphology has been modified to have sphere nanoparticles and a sheet-like morphology. The recombination proportion of suppressed charge carriers has been explored using PL examination. PL spectra revealed defect-related emissions such as near band edges and deep-level emission. The bandgap of a nanocomposite has been influentially optimized from 3.2 eV to 1.76 eV using UV studies. The luminescent color of ZnSnO3 was tuned by incorporating tin ferrite. The magnetic moment of tin ferrite created an opportunity to reliably retrieve nanocomposite. SnFe2O4's unique influence on ZnSnO3 has the potential to be used as a photocatalytic magnetic separation, display device, and gas-sensing material.

Degradation of formaldehyde by photo-Fenton process over n-ZVI/TiO2 catalyst.

The degradation of formaldehyde in a photo-Fenton reaction was studied using n-ZVI/TiO2 as the catalyst. The effects of %n-ZVI loading, catalyst dosage, H2O2, and pH on formaldehyde degradation were studied. The n-ZVI/TiO2 catalysts were prepared by impregnation with chemical reduction, and their catalytic activity was evaluated in a batch reactor under UVC light. Transmission electron microscopy (TEM) was used to determine that the n-ZVI nanoparticle size was 39.41nm. X-ray photoelectron spectroscopy (XPS) was used to study the oxidation states of 2%n‑ZVI/TiO2, and the Fe 2p spectrum of 2%n-ZVI/TiO2 indicated the presence of Fe0. The optimal conditions for the complete removal of formaldehyde within 30min were an n-ZVI loading of 2 wt.%, a catalyst dosage of 0.5g/L, 30mM H2O2, and an initial pH of 3. After the reaction, the C-H functional group of formaldehyde was not observed due to the •OH radicals generated by Fe0 and H2O2 attacking the formaldehyde molecule. Moreover, no Fe leaching was observed, presenting an advantage compared with homogeneous Fe catalysts. Therefore, 2%n‑ZVI/TiO2 shows excellent potential as a photo-Fenton catalyst for the environmentally friendly degradation of formaldehyde.

XPS analysis of graphitic carbon nitride functionalized with CoO and CoFe2O4

Materials based on graphitic carbon nitride (gCN) have drawn a great deal of attention as (photo)electrocatalysts triggering the oxygen evolution reaction (OER) in H2O splitting processes to yield hydrogen fuel. In this work, nonmonochromatized Mg Kα radiation (1253.6 eV) was used to acquire photoelectron spectroscopy data on gCN-containing composite systems supported on fluorine-doped tin oxide. The investigated materials were prepared via a straightforward decantation route to yield carbon nitride, followed by functionalization with low amounts of nanostructured co-catalysts (CoO, CoFe2O4) through radio frequency-sputtering, and final thermal treatment under an inert atmosphere. Structural and morphological analyses highlighted the formation of composite systems, in which the single constituents, featuring an intimate contact, maintained their chemical identity. This work proposes a data record including both survey scans and high-resolution spectra of C 1s, N 1s, O 1s, Co 2p, and Fe 2p core-levels for three representative specimens comprising bare and functionalized graphitic carbon nitride (gCN, gCN-CoO, and gCN-CoFe2O4). The obtained results, discussed in relation to the different chemical environments for the various elements, will be useful as a comparison for further studies in related fields.

XPS study of the thermal stability of passivated NiCrFeCoMo multi‐principal element alloy surfaces

X‐ray photoelectron spectroscopy analysis was applied to investigate the thermal stability under ultra‐high vacuum environment of the surface oxide film formed by electrochemical passivation of a newly designed Cr15Fe10Co5Ni60Mo10 (at.%) multi‐principal element alloy and providing the alloy superior localized corrosion resistance compared to conventional stainless steels and alloys. A spectral decomposition methodology involving the subtraction of Auger peaks overlapping the Fe 2p and Co 2p core level regions was applied for quantification of the oxide film composition and thickness. The results show that, at 100°C, the passive oxide film is mainly dehydrated and dehydroxylated. Obvious loss of Ni hydroxide and conversion of Mo (VI) to Mo (IV) species are observed at 200°C, with further reduction of Mo species to Mo (III) observed at 300°C. In this temperature range, the total cation quantity in the oxide film remains stable despite the compositional alteration. At 400°C, Cr (III) oxide forms at the expense of Fe and Mo oxides, resulting in an oxide film essentially consisting of chromium oxide. At 500°C, Cr (III) oxide is eliminated, making the passive film unstable at this temperature. Possible Cr oxide removal mechanisms are discussed.

Novel synthesis of multi-layered rGO/Fe3O4 nanocomposite in a single step and its efficient electrochemical sensing of vitamin C

A facile single-step solvothermal growth of rGO/Fe3O4 nanocomposite was achieved at a temperature of 230 °C by using CaC2 as a carbon source for rGO and an iron source. The synthesised rGO/Fe3O4 nanocomposite was characterised by XRD, Raman, FTIR, TEM, XPS and EDX analyses. The XRD data revealed that the as-grown Fe3O4 nanoparticles were highly crystalline, and the average particle size obtained from the TEM analysis was 13 nm. The surface dispersion of agglomerated, almost spherical-shaped Fe3O4 nanoparticles stacked on the surface of rGO sheets was confirmed from TEM analysis. The calculated intensity ratio of the G and D bands from the Raman spectra points to the presence of multi-layered rGO in the nanocomposite. From the XPS spectra, the binding energies corresponding to C 1 s, O 1 s and Fe 2p were obtained, and the electronic relationship between Fe3O4 and rGO in the sample was evidenced by Fe-O-C bonding. The rGO/Fe3O4 nanocomposite was tested for the electrochemical detection of L-AA using three electrode setup. From the EIS spectra, the rGO/Fe3O4/GCE exhibit high conductivity and faster electron transfer rates and thus was expected to give enhanced electrochemical properties. Excellent electrochemical properties were observed towards L-AA detection, and LOD was obtained to be 18.5 μM. The rGO/Fe3O4/GCE also achieved high sensitivity of the order of 92 μA mM−1 cm−2 towards the L-AA sensing. Moreover, we addressed the poor selectivity, short linear detection range and poor repeatability of the previously reported L-AA sensors and covered all these defects. The rGO/Fe3O4/GCE shows excellent repeatability, selectivity and a higher detection range (10 μM to 100 mM) for the electrochemical evaluation of L-AA. Also, the experiments were extended to the real sample analysis in the commercial vitamin C tablets, and the results show that rGO/Fe3O4/GCE is suitable for large scale applications.