Graphene influence on the structure, magnetic, and optical properties of rare-earth perovskite

Physica Status Solidi (a)

Beskrovnyĭ

Ионов

et al. 2021

Self Cite

Herein, graphene nanocomposite of CuO–rGO is synthesized by simple precipitation reaction. Characterization by different techniques confirms the reduction of graphene oxide and formation of CuO–rGO. The CuO nanocrystals are uniformly distributed on graphene sheets. Neutron and X‐ray diffraction (XRD) prove the formation of single phase of CuO monoclinic crystal system with space group C2/c. Infrared spectroscopy shows vibration modes of graphene and CuO. Morphological characterization is carried out by scanning electron microscope (SEM) (SEM) and transmission electron microscope (TEM). It shows that the particle size ranges from 20 to 60 nm in which confirmed by four different theoretical approaches calculated from XRD peaks broadening data. The electronic properties using X‐ray photoelectron spectroscopy are also provided.

W_{normalf} = 0.94 λ / D \cos θ_{normalD}

Section: Resultsmentioning

confidence: 99%

Structure Investigation by Neutron Diffraction and X‐Ray Diffraction of Graphene Nanocomposite CuO–rGO Prepared by Low‐Cost Method

Physica Status Solidi (a)

Beskrovnyĭ

Ионов

et al. 2021

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“…In addition to Debye–Scherrer's method to determine the crystalline size, there are another methods to estimate D and the average lattice microstrain ε [ 32–36 ] can be also estimated from the Williamson–Hall's equation, [ 37–43 ] Halder–Wagner's method, [ 44–46 ] and size–strain plot (SSP) (linear fit is shown in Figure ). [ 47,48 ] Table 3 shows the calculated value of crystalline size and microstrain for synthesized perovskites at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Optical Properties of New Organic–Inorganic Hybrid Perovskites [(NH₃)₂(CH₂)₃]CuCl₄ and [(NH₃)₂(CH₂)₄]CuCl₂Br₂

Kandeel

El-Sherif

Physica Status Solidi (a)

2021

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Organic–inorganic hybrid perovskites (OIHs) are exceptionally promising sector of novel materials for optoelectronic applications. Herein, the OIHs of the formula [(NH3)2(CH2)3]CuCl4 labeled by C3CuCl and [(NH3)2(CH2)4]CuCl2Br2 labeled by C4CuClBr are prepared by slow evaporation method. The synthesis process is achieved by mixing equimolar ethanolic solutions ratios (1:1) of their basic components (organic/inorganic). Characterizations of these materials using microchemical analysis, energy dispersion X‐ray (EDX) and X‐ray diffraction (XRD) are discussed. The XRD is used to estimate the crystalline size for prepared compounds and found in the range of 38.8 and 48.8 nm for C3CuCl and C4CuClBr, respectively. The vibrational spectra are studied by Fourier transformation infrared spectroscopy (FTIR) and show the major diffraction peaks of compounds and their assignment. UV‐region strong absorption is clarified in the optical properties studied for Cu hybrid, whereas the bandgap energy estimated via Kubelka–Munk equation and found 2.8 and 3.85 eV for C3CuCl and C4CuClBr, respectively.

“…For the ZnO-rGO, the characteristic vibration peaks around 575 cm -1 is assigned to the stretching mode of the Zn-O. The peak at 1600 cm -1 corresponds to C=C is exists and indicating the existence of graphene nanosheet [2,5]. The results of FT-IR spectra are verifying that the ZnO-rGO nanocomposite is formed in the synthesis.…”

Section: Fig2b Xrd Pattern Of Zno-rgo Nanocompositementioning

confidence: 92%

“…The steps of preparation of graphene oxide from graphite using Hummer's method are illustrated in our pervious work [1][2][3][4][5] Finally H2O2 and D.I water are uses for exfoliation assistant of the GO layers.…”

Section: Preparation Of Graphene Oxide Go By Hummer's Methodmentioning

confidence: 99%

See 1 more Smart Citation

Facile synthesis of nanostructured ZnO–rGO based graphene and its application in wastewater treatment

Ramadan

J Mater Sci: Mater Electron

2021

Self Cite

In the present work graphene oxide GO prepared by chemical exifliation of graphite using Hummer's method. A facile and green synthesis of ZnO-rGO nanocomposite was performed via Alovera plant extract. The characterization tools (XRD-FTIR-FESEM-TEM-AFM) proved the formation of single phase of ZnO-rGO nanocomposite. Since the environmental contamination caused by Cd(II) ion is a world issue as it has a harmful effect especially on the human health and environment. Subsequently, our goal in this work is to find an accurate method for detection and adsorption of toxic Cd(II). ZnO and ZnO-rGO nanocomposites are prepared for removing Cd(II) and on behalf of increasing its removal efficiency, GO is added. The results showed a great improvement in removal efficiency reached up to 90% at pH 6 after 90 min. the structure and surface of prepared samples studied through XRD, FTIR, FESEM and AFM.