Enhancement in photoluminescence performance of carbon-based Fe3O4@ZnO–C nanocomposites

Astuti, Astuti; Arief, Syukri; Muldarisnur, Mulda; Zulhadjri, Zulhadjri; Usna, Sri R.A.

doi:10.1016/j.vacuum.2023.111935

Cited by 27 publications

(12 citation statements)

References 28 publications

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“…In a corrosive environment, iron underwent a series of redox reactions (as shown in reactions –), and iron oxides were produced as well as some intermediate products. As shown in Figure a, the characteristic peak observed at 3431 cm –1 was attributed to the stretching vibration of OH – , the peaks at 1676 and 546 cm –1 were assigned to the Fe–O bond stretching vibration in Fe 3 O 4 , the characteristic peak of γ-FeOOH appeared at 1021 cm –1 , and the peak at 1381 cm –1 belonged to CO. − The peak at 500 cm –1 corresponded to Fe–O bond bending vibrations in Fe 2 O 3, while the peak near 480 cm –1 was attributed to Fe–O–Zn . Among the many corrosion products, Fe 3 O 4 was paramagnetic and was susceptible to Lorentz force and gradually deposited near the corrosion sites, providing effective secondary protection. Fe → Fe 2 + + 2 normale − Fe 2 + → Fe 3 + + normale − 1 2 normalO 2 + normalH 2 normalO + 2 normale − → 2 OH − Fe 2 + + 2 OH − → Fe false( OH false) 2 4 Fe false( OH false) 2 + 2 normalH 2…”

Section: Resultsmentioning

confidence: 95%

Enhanced Anticorrosion Properties and Mechanism of Co/N Codoped Modified ZnO Dilute Magnetic Solid Solutions

Tian

Chen

Liu

et al. 2023

ACS Appl. Eng. Mater.

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The micromagnetic field of magnetic materials helps to improve the anticorrosion properties, so magnetic enhancement measures may bring considerable corrosion inhibition ability. Based on the magnetic generation mechanism of ZnO, the concentration of oxygen vacancy in the crystal lattice was regulated by the doping of magnetic metal Co, the introduction of nonmetallic N, and light treatment, so as to achieve a gradual increase in magnetism. The increased magnetism meant that micromagnetic fields could control electron transport to a greater extent, slowing the rate of corrosion. Moreover, an external magnetic field was applied to the corrosion system and resulted in the formation of a dense secondary protective film on the surface. Results showed that for the corrosion resistance of Co/N codoped ZnO (CNZO) dilute magnetic solid solutions (DMSs), the composite impedance value increased by 1204.0% compared to the pure epoxy coating, and the impedance value increased again by 4100 ohm·cm2 after the application of an external magnetic field and is 5.73 times that of ZnO. This work also confirmed that the magnetic properties of ZnO-based DMSs were positively correlated with the corrosion resistance, which provided guidance for the design of corrosion inhibition materials in other systems.

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Section: Resultsmentioning

confidence: 95%

Enhanced Anticorrosion Properties and Mechanism of Co/N Codoped Modified ZnO Dilute Magnetic Solid Solutions

Tian

Chen

Liu

et al. 2023

ACS Appl. Eng. Mater.

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“…Te synthesis of nanocomposite Fe 3 O 4 @ZnO/C begins with the synthesis of Fe 3 O4 nanoparticle combined with ZnO by the coprecipitation method [12,22,23]. A modifed coprecipitation method was used to create Fe 3 O 4 @ZnO nanoparticles as done by Astuti et al [24].…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Properties of Magnetic-Luminescent Fe3O4@ZnO/C Nanocomposites

Astuti

Arief

Muldarisnur

et al. 2023

Journal of Nanotechnology

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A Fe3O4@ZnO/C nanocomposite with a core-shell structure was synthesized using the co-precipitation method. To prevent the aggregation of the Fe3O4 magnetic particles, polyethylene glycol (PEG) was added. The X-ray diffractometer (XRD) results confirmed the formation of Fe3O4 and ZnO phases, with Fe3O4 having a cubic crystal system and ZnO having a hexagonal crystal system. Carbon in Fe3O4@ZnO/C had no effect on the crystal structure of Fe3O4@ZnO. Images from transmission electron microscopy (TEM) and scanning electron microscopy (SEM) revealed that the nanocomposite formed a core-shell structure. The Fourier transform infrared (FTIR) spectra verified the presence of bonds among ZnO, Fe3O4, and carbon. The appearance of the stretching vibration of the C≡C bond on the Fe3O4@ZnO/C sample revealed the nanocomposites’ carbon coupling. Photoluminescence (PL) spectroscopy was used to characterize the optical properties of the nanocomposites. Based on the results of the PL, the sample absorption of visible light was in the wavelength range of 400–700 nm. The photoluminescence of Fe3O4@ZnO differed from that of the Fe3O4@ZnO/C, especially in the deep-level emission (DLE) band. There was a phenomenon of broadening and shift of the band at a shorter wavelength, namely, in the blue wavelength region. Magnetic properties were characterized by vibrating-sample magnetometry (VSM). Based on the VSM results, the sample coupled with carbon exhibited a decrease in magnetic saturation. The presence of carbon changed photon energy into thermal energy. So, this material, apart from being a bioimaging material, can also be developed as a photothermal therapy material.

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“…The hydrothermal technique provides a simple and environmentally friendly means of producing Cdots that is economical and ensures uniform particle sizes [16]. So, this Fe3O4 modification can be done by adding Cdots [17,18]. The addition of Cdots does not change the magnetic properties of Fe3O4, instead increasing the surface area and dispersibility of Fe3O4 nanoparticles [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Dielectric Permittivity Properties of Fe₃O₄/Cdots Nanocomposites Synthesized by Green Route Utilizing Moringa Oleifera Extract and Watermelon Peel

Latifa,

Jiananda,

Riyanto

et al. 2024

J. Phys.: Conf. Ser.

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Dielectric materials are beneficial for storing electrical energy due to their insulating and polarization properties in response to external electric fields. Magnetite has shown promise as a dielectric material among other materials due to its good magnetic properties, low toxicity, and biocompatibility. However, the weakness of Fe3O4, which has low stability and easy agglomeration, requires a modification on its surface by using Carbon dots (Cdots). This research investigates the dielectric properties of Fe3O4/Cdots obtained through the green synthesis method. Fe3O4 nanoparticles were synthesized using the co-precipitation method with Moringa oleifera leaf extract as a reducing and stabilizing agent. In contrast, Cdots were synthesized using the hydrothermal method with watermelon peel waste as a carbon source. The Fe3O4 composite nanoparticles were characterized using X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray (SEM-EDX), ultraviolet-visible spectroscopy (UV-Vis), and impedance spectroscopy. The XRD spectra revealed the existence of cubic inverse spinel and a reduction in crystal size as the concentration of Cdots increased, measuring 7.8 and 7.1 nm, respectively. SEM-EDX revealed that the sample is composed of Fe, O, and C elements and has a spherical shape with Cdots distributed on the surface of Fe3O4. The UV-Vis spectrum showed the absorption peak of Cdots at 282 nm. The Fe3O4 absorption peak is identical to the Fe3O4/Cdots absorption peak at 193 nm. The increase in band gap energy from 2.96 to 3.33 eV is related to the increase in Cdots concentration. In the 10-900 kHz frequency range, dielectric property tests demonstrated peak dielectric permittivity values (real and imaginary). A substantial decrease was observed between 10 kHz and 200 kHz, followed by a relatively stable pattern up to 900 kHz. The loss tangent value obtained has a tanδ value <0.5, which means that the addition of Cdots affects reducing the energy loss stored in Fe3O4.

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Enhancement in photoluminescence performance of carbon-based Fe3O4@ZnO–C nanocomposites

Cited by 27 publications

References 28 publications

Enhanced Anticorrosion Properties and Mechanism of Co/N Codoped Modified ZnO Dilute Magnetic Solid Solutions

Enhanced Anticorrosion Properties and Mechanism of Co/N Codoped Modified ZnO Dilute Magnetic Solid Solutions

Synthesis and Properties of Magnetic-Luminescent Fe3O4@ZnO/C Nanocomposites

Microstructures and Dielectric Permittivity Properties of Fe₃O₄/Cdots Nanocomposites Synthesized by Green Route Utilizing Moringa Oleifera Extract and Watermelon Peel

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Enhancement in photoluminescence performance of carbon-based Fe3O4@ZnO–C nanocomposites

Cited by 27 publications

References 28 publications

Enhanced Anticorrosion Properties and Mechanism of Co/N Codoped Modified ZnO Dilute Magnetic Solid Solutions

Enhanced Anticorrosion Properties and Mechanism of Co/N Codoped Modified ZnO Dilute Magnetic Solid Solutions

Synthesis and Properties of Magnetic-Luminescent Fe3O4@ZnO/C Nanocomposites

Microstructures and Dielectric Permittivity Properties of Fe3O4/Cdots Nanocomposites Synthesized by Green Route Utilizing Moringa Oleifera Extract and Watermelon Peel

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Microstructures and Dielectric Permittivity Properties of Fe₃O₄/Cdots Nanocomposites Synthesized by Green Route Utilizing Moringa Oleifera Extract and Watermelon Peel