Exploring the ferroelectric effect of nanocrystalline strontium zinc titanate/Cu: Raman and antimicrobial activity

Bakr, Abu; Abdel‐Aziz, Mohamed S.; Nahrawy, Amany M. El

doi:10.1007/s10854-020-03323-9

Cited by 27 publications

(12 citation statements)

References 32 publications

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“…This test was repeated three times. The presence of a clear inhibition zone around the nanocomposite sample in the immunized Petri-dishes is a signal of the antibacterial activity of nano-Ag/Ca chitosan nanocomposite [35][36][37].…”

Section: Antimicrobial Potential Assaymentioning

confidence: 99%

Nano-architecture of CaO/Ag-chitosan nanocomposite by sol gel process: formation and characterization

2021

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Functionalize nano-architecture CaO/Ag-chitosan bio-nanoparticles were prepared by the acetic acid sol-gel process and were loaded into the chitosan nanocomposite. The so prepared bioactive nano-CaO/Ag-chitosan nanocomposite was characterized using XRD, TEM, FE-SEM, optical, and the antimicrobial activity was evaluated. The antibacterial evaluations implied that chitosan, nano-CaO, and nano-CaO/Ag-chitosan are exhibited subtle antimicrobial activities against both Gram-positive (Staphylococcus aureus) microbes and Gram-negative (Escherichia coli).Ag doping of CaO produces an oxygen vacancy, defects, and improved light scattering and so leads to transmission increase and absorption increase which in turn lead to increase of the bandgap energy. The optical conductivity of the nanocomposites decreased with Ag addition as a direct result of the bandgap increase. These prefatory investigations of the bio nanocomposites will open a good platform for their use in various bio-industries.

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Section: Antimicrobial Potential Assaymentioning

confidence: 99%

Nano-architecture of CaO/Ag-chitosan nanocomposite by sol gel process: formation and characterization

2021

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“…The peaks corresponding to wavenumbers of 514, 698, 856, 1022, 1073, 1445, and 1777 cm −1 are associated with various chemical bonds Sr-O, Sr-O-Sr, Sr-O-Cu, Sr-O-Cr, Sr-O-Cu-O-, and Sr-OH, respectively. 30,35 The decrease in FTIR band width at 856 cm −1 and 1454 cm −1 as the Cr concentration increases can be attributed to the removal of OH and unbounded groups (Sr-OH, Cu-OH, Sr-O-) from the internal arrangement, along with the promotion of structural uniformity facilitated by the Cr-O-. 4,16 Distinctive visible and near-infrared (FT-IR) spectra exhibiting multiple peak maxima within the 500 to 1100 cm −1 range were observed in all samples.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental plates were incubated for 24 h at 37 °C, and the diameters of the inhibition zones (mm) were measured and recorded. [27][28][29][30]…”

Section: Experimental Techniquesmentioning

confidence: 99%

Adjusting the Effects of Cr³⁺ Doping on Structural, Dielectric, Antimicrobial Properties of Delafossite SrCuO₂ Nanoparticle

Talha,

Meaz,

El Nahrawy

2024

ECS J. Solid State Sci. Technol.

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SrCu(1-x) CrxO2 nanoparticles (x=0.0, 0.6, 1.2, and 1.8) nanoparticles were synthesized using sol-gel processing and subjected to calcination at 650°C. The investigation delved into the influence of varying chromium concentrations on the structural, FTIR, electrical, and antimicrobial characteristics. The microstructure of the SrCu(1-x)CrxO2 nanoparticles (x=0.0, 0.6, 1.2, and 1.8) nanoparticles were analyzed through X-ray diffraction and transmission electron microscopy. Additionally, changes in chemical bonds were observed as the Cr content increased. The dielectric parameters exhibit an increase with higher Cr ratios. Additionally, there is a decrease in these parameters as the frequency rises, which could be attributed to the mobility of charged particles within the SrCu(1-x)CrxO2 nanostructure. Our investigation underscores the significant role of Cr incorporation in influencing both the dielectric properties and antimicrobial activity of Cr, emphasizing its relevance for diverse applications.

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“…It gives an idea about the activation energy and relaxation time related to dipoles as well as the bulk affect. The complex modulus (M*) being the reciprocal complex permittivity has also real and imaginary components (M″ and M′) [54]. Figure 7(a) shows the variation of M″ and M′ as a function of frequency at different temperatures.…”

Section: Electrical Analysismentioning

confidence: 99%

Structural, dielectric and electrical characteristics of manganese modified (Bi_0.5Ba_0.25Sr_0.25) (Ti_0.5Fe_0.5)O₃ relaxor

Auromun¹,

Choudhary²

2021

Phys. Scr.

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In this communication, detailed studies of the structural, microstructural, dielectric, and electrical properties of polycrystalline materials, (Bi0.5Ba0.25Sr0.25) (Ti0.5Fe0.5)O3 and (Bi0.5Ba0.25Sr0.25) (Ti0.25Mn0.25Fe0.5)O3, synthesized by using a high–temperature solid-state-reaction method, have been reported. X-ray structural and scanning electron micrograph studies exhibit phase pure tetragonal system and surface morphology (size and distribution of grains and grain boundaries) of the samples respectively. Analysis of the temperature and frequency dependence of dielectric and electrical (impedance, modulus, and conductivity) data reveals the ferroelectric relaxor behavior, relaxation mechanism, and semiconductor (negative temperature coefficient of resistance) properties of the bulk BFBST and Mn modified BFBST electro-ceramics. The relaxation time and activation energy (Ea) were calculated from the above data. The characteristics of Mn modified BFBST have been compared to that of it’s parent (BFBST) compound. The different inherent conduction mechanisms, such as Ohmic, hopping, space charge limited (SCLC) have been analyzed. The bulk- and interface-limited conduction processes were evidently found in the materials by the Poole–Frenkel (PF) and Schottky (SEmen modified BFBST have been compared to that of its parent (BFBST) compound) emission fitting of the J ∼ E characteristic data. The leakage data of BFBST-Mn (Mn modified Mn) quantified the average energy gap (Eg) in the range of 0.83–0. 87 eV for different applied voltages and in a wide range of temperature (25 °C–300 °C). With the increase in voltage, Eg decreases. This work suggests that Mn-substitution (Mn4+) at B (Ti4+) site keeping the stoichiometry undisturbed enhances structural, dielectric response (higher dielectric constant) and reduce the leakage behavior especially at low temperature and high-frequency range.

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Exploring the ferroelectric effect of nanocrystalline strontium zinc titanate/Cu: Raman and antimicrobial activity

Cited by 27 publications

References 32 publications

Nano-architecture of CaO/Ag-chitosan nanocomposite by sol gel process: formation and characterization

Nano-architecture of CaO/Ag-chitosan nanocomposite by sol gel process: formation and characterization

Adjusting the Effects of Cr³⁺ Doping on Structural, Dielectric, Antimicrobial Properties of Delafossite SrCuO₂ Nanoparticle

Structural, dielectric and electrical characteristics of manganese modified (Bi_0.5Ba_0.25Sr_0.25) (Ti_0.5Fe_0.5)O₃ relaxor

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Exploring the ferroelectric effect of nanocrystalline strontium zinc titanate/Cu: Raman and antimicrobial activity

Cited by 27 publications

References 32 publications

Nano-architecture of CaO/Ag-chitosan nanocomposite by sol gel process: formation and characterization

Nano-architecture of CaO/Ag-chitosan nanocomposite by sol gel process: formation and characterization

Adjusting the Effects of Cr3+ Doping on Structural, Dielectric, Antimicrobial Properties of Delafossite SrCuO2 Nanoparticle

Structural, dielectric and electrical characteristics of manganese modified (Bi0.5Ba0.25Sr0.25) (Ti0.5Fe0.5)O3 relaxor

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Adjusting the Effects of Cr³⁺ Doping on Structural, Dielectric, Antimicrobial Properties of Delafossite SrCuO₂ Nanoparticle

Structural, dielectric and electrical characteristics of manganese modified (Bi_0.5Ba_0.25Sr_0.25) (Ti_0.5Fe_0.5)O₃ relaxor