Structural, optical and electrical properties of undoped and doped (Al, Al + Mn) ZnO nanoparticles synthesised by green combustion method using terminalia catappa seed extract

Savitha, D.; Latha, H K E; Lalithamba, H. S.; Mala, S.; Jeppu, Yogananda

doi:10.1016/j.matpr.2021.12.365

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…The real part of relative permittivity symbolizes the polarization of the substance while the dielectric loss tangent (tan d) signifies the energy loss due to the polarization and ionic conduction [58]. The relative permittivity and dielectric loss tangent of the synthesized compositions are related to the occurrence of space charge polarization alongside on structural defects, temperature, morphology, frequency and chemical composition [59,60]. Figure 8a illustrates the dependence of the relative permittivity on frequency for 0%TC, 2%TC, 4%TC and 6%TC pellets at room temperature.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…The variation of the r ac with frequency displays two regions from frequency-independent (region of the low frequency) to frequency-dependent (region of the high frequency), indicating relaxation phenomenon of r ac . The gradual increases of r ac with frequency can be discussed based on interfacial Maxwell-Wagner influence [59,60]. The weak conducting grain boundaries are more effective at lower frequency, which consecutively decreases the r ac of the CuO samples.…”

Section: Electrical Conductivitymentioning

confidence: 99%

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High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Youssef

Yakout

2023

J Mater Sci: Mater Electron

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Tetra-doping by (Mn, Fe, Co, Ni) ions strongly boosted the room temperature dielectric constant and the ferromagnetic-superparamagnetic characteristics of monoclinic CuO structure. In this study, undoped CuO, Cu0.98Mn0.005Fe0.005Co0.005Ni0.005O, Cu0.96Mn0.01Fe0.01Co0.01Ni0.01O and Cu0.94Mn0.015Fe0.015Co0.015Ni0.015O nanocompositions were synthesized through coprecipitation technique. The crystal structure analysis verified that all samples have a pure single phase, corresponding to monoclinic CuO structure. The substitution of Cu2+-sites into CuO lattice by Mn2+, Fe2+/3+, Co2+ and Ni2+ ions has been deduced from the expansions of lattice constant, shifts of XRD diffraction peaks and band gap energy alteration. The additions of (Mn, Fe, Co, Ni) ions lead to the formation of homogenous distributed very fine spherical nanoparticles, especially at large concentrations of dopants (Cu0.94Mn0.015Fe0.015Co0.015Ni0.015O sample). The tetra-doping by (Mn, Fe, Co, Ni) ions reduced the intensity of the diffuse reflectance alongside red shifted the absorption edge and the band gap energy of monoclinic CuO structure. Cu0.98Mn0.005Fe0.005Co0.005Ni0.005O exhibits a high relative permittivity value of 6096 at low frequency of 42 Hz with small dielectric loss tangent (tan δ) compared to pure one. The tetra-doping by (Mn, Fe, Co, Ni) dopants induced excellent intrinsic ferromagnetic and superparamagnetic hysteresis loops into monoclinic CuO structure with full saturation loops shape and variable coercivity values.

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Section: Dielectric Propertiesmentioning

confidence: 99%

Section: Electrical Conductivitymentioning

confidence: 99%

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Youssef

Yakout

2023

J Mater Sci: Mater Electron

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“…The reducing agents in these methods are the plant metabolites such as alkaloids, polysaccharides, amino acids, vitamins, flavonoids, and terpenoids, where they are all reported to possess the inert properties to reduce metal ions/oxides to zero-valent metal NPs [11]. In addition to other plant extracts, a substantial amount of research reported ZnO NPs synthesis using extracts of various species of the genus Terminalia, which include T. catappa, T. chebula, T. arjuna, terdinandiana, and T. bellirica [12][13][14][15]. Of the various species, no available literature reported indicating the synthesis of ZnO NPs using Terminalia mantaly (TM) for the adsorption of bacteria.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Escherichia coli Using ZnO-Trimethyl Chitosan Nanocomposite Hydrogel Formed by the Green Synthesis Route

Bwatanglang,

Mohammad,

Janet

et al. 2023

Gels

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In this study, we tested the biosorption capacity of trimethyl chitosan (TMC)-ZnO nanocomposite (NC) for the adsorptive removal of Escherichia coli (E. coli) in aqueous suspension. For the formation of ZnO NPs, we followed the green synthesis route involving Terminalia mantaly (TM) aqueous leaf extract as a reducing agent, and the formed ZnO particles were surface-coated with TMC biopolymer. On testing of the physicochemical characteristics, the TM@ZnO/TMC (NC) hydrogel showed a random spherical morphology with an average size of 31.8 ± 2.6 nm and a crystal size of 28.0 ± 7.7 nm. The zeta potential of the composite was measured to be 23.5 mV with a BET surface area of 3.01 m2 g−1. The spectral profiles of TM@ZnO/TMC NC hydrogel on interaction with Escherichia coli (E. coli) revealed some conformational changes to the functional groups assigned to the stretching vibrations of N-H, C-O-C, C-O ring, and C=O bonds. The adsorption kinetics of TM@ZnO/TMC NC hydrogel revealed the pseudo-second-order as the best fit mechanism for the E. coli biosorption. The surface homogeneity and monolayer adsorption of the TM@ZnO/TMC NC hydrogel reflects majorly the entire adsorption mechanism, observed to display the highest correlation for Jovanovic, Redlich–Peterson, and Langmuir’s isotherm models. Further, with the use of TM@ZnO/TMC NC hydrogel, we measured the highest adsorption capacity of E. coli to be 4.90 × 10 mg g−1, where an in-depth mechanistic pathway was proposed by making use of the FTIR analysis.

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Citrus limon assisted green synthesis of MgO nanoparticles: Evaluation of phase, functional groups, surface morphology, thermal stability and colloidal stability

Poonguzhali¹,

Srimathi²,

Kumar

et al. 2022

Ceramics International

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Structural, optical and electrical properties of undoped and doped (Al, Al + Mn) ZnO nanoparticles synthesised by green combustion method using terminalia catappa seed extract

Cited by 7 publications

References 33 publications

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Biosorption of Escherichia coli Using ZnO-Trimethyl Chitosan Nanocomposite Hydrogel Formed by the Green Synthesis Route

Citrus limon assisted green synthesis of MgO nanoparticles: Evaluation of phase, functional groups, surface morphology, thermal stability and colloidal stability

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