Synthesis of Zn(II)-Doped Magnetite Leaf-Like Nanorings for Efficient Electromagnetic Wave Absorption

Abstract

We report the thermal annealing-induced formation of ring-like structure of Zn(II)-doped magnetite from iron alkoxide leaf-like nanoplate precusor. The phase, structure and morphology of magnetite nanorings were comprehensively characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscope, scanning electron microscope, and transmission electron microscope. The obtained Zn(II)-doped magnetite nanorings are of 13–20 nm in edge width, 70–110 nm in short axis length and 100–150 nm in long axis length. The growth mechanism was possibly due to a combined effect of decomposition of the organic component and diffusion growth. Zn(II)-doped magnetite nanorings delivered saturation magnetization of 66.4 emu/g and coercivity of 33 Oe at room temperature. In addition, the coatings containing Zn(II)-doped magnetite nanorings as fillers exhibit excellent microwave absorption properties with a maximum reflection loss of −40.4 dB and wide effective absorbing band obtained in coating with thin thickness of 1.50 mm.

Cubic cobalt and zinc co-doped magnetite nanoparticles for persulfate and hydrogen peroxide activation towards the effective photodegradation of Sulfalene

“…However, the photocatalytic activity was increased for Co doped and Zn/Co co-doped magnetite, arousing from the reduction in their bandgap energy. The obtained results accord with the findings of the previously published papers in which the photocatalytic performance of magnetite nanoparticles has increased due to the positive effect of the doped metals in suppressing the recombination of photogenerated e -/holes [40].…”

“…S6 (d), the peaks at 1045.2 , and 1020.8 eV correspond to Zn 2p 1/2 and Zn 2p 3/2 , respectively. This result can be a prominent sign of the presence of Zn 2+ on the surface of the co-doped magnetite [40].…”

Unconventional Approach to Fabricating a TiO2 Nanoring with Precise Dimension Control Based on Starlike Polymeric Nanoreactors

“…For the past two decades, there was a rapid development of synthesis approaches for fabricating inorganic nanostructures with diverse dimensions and morphologies, including nanoparticles, hollow nanoparticles, nanorods, nanotubes, and nanoplatelets, leading to an in-depth understanding of various morphology-dependent physical properties. 1−5 Of these fancy nanostructures, nanorings have been widely used because of their unique properties at the nanoscale in optical, 6−8 magnetic, 9,10 and optoelectronic devices. 11−13 Tuning the diameter and wall thickness of nanorings to obtain dimensionrelated properties has become a research hotspot.…”

“…F or the past two decades, there was a rapid development of synthesis approaches for fabricating inorganic nanostructures with diverse dimensions and morphologies, including nanoparticles, hollow nanoparticles, nanorods, nanotubes, and nanoplatelets, leading to an in-depth understanding of various morphology-dependent physical properties. − Of these fancy nanostructures, nanorings have been widely used because of their unique properties at the nanoscale in optical, − magnetic, , and optoelectronic devices. − Tuning the diameter and wall thickness of nanorings to obtain dimension-related properties has become a research hotspot . For instance, the characteristic behavior of localized surface plasmon resonance (LSPR) in response to the selective binding of biomolecules had been studied in Au nanorings, demonstrating that Au rings could be used for detecting the selective binding between biotin and streptavidin through the LSPR spectra .…”

Fused Hybrid Linkers for Metal–Organic Frameworks-Derived Bifunctional Oxygen Electrocatalysts

“…TAL-6-900 material, however, incorporated iron oxide nanoparticles with a characteristic interplanar spacing of 0.29 nm corresponding to d (220) of Fe3O4. [26] The XPS survey spectra show the presence of carbon, oxygen, nitrogen and iron on the surface of the catalyst materials ( Figures 2c and S1 and Table S1). The deconvolved N1s region shows the presence of graphitic N (nitrogen), pyrrolic N, Fe-Nx and pyridinic N species, which all are required for the high ORR/OER activity.…”