Optical absorption red and blue shifts in ZnFe2O4 nanoparticles

Kislov, Nikolai; Srinivasan, Sesha S.; Émirov, Yu. N.; Stefanakos, Elias K.

doi:10.1016/j.mseb.2008.10.032

Cited by 120 publications

(44 citation statements)

References 37 publications

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“…A graph is plotted between [F (R)hυ] 2 and hυ; the intercept value is the bandgap energy and these are shown in Fig. 8a [28,29]. This result is in good agreement with the Rietveld analysis, which suggested that the crystallite size of the samples slightly decreases with increasing Mn 2+ content.…”

Section: Diffuse Reflectance Spectroscopysupporting

confidence: 78%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

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Spinel Mn x Co 1−x Fe 2 O 4 ; x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles were synthesized by ureaassisted auto combustion method using nitrates of Co, Mn and Fe as the starting materials and urea as the fuel. X-ray diffraction (XRD) analysis showed that all composition was found to have a cubic spinel structure. The average crystallite size of the samples was estimated using the Debye-Scherrer formula and was found to be in the range of 22.62 and 36.45 nm. The lattice parameter increased from 8.432 to 8.457Å with increasing the Mn 2+ content, which was determined by Rietveld analysis. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses were used to study the morphological variation, and the results showed a nanosized particlelike morphology. Energy-dispersive X-ray (EDX) results showed that the composition of the elements was relevant as expected from the synthesis. The bandgap energy of the pure CoFe 2 O 4 was estimated to be 2.33 eV from UV-visible diffuse reflectance spectroscopy (DRS). With the increase of Mn 2+ ion, the bandgap energy increased from 2.35 to 2.42 eV. The magnetic properties of the A. Manikandan ( ) · S. samples were investigated at room temperature by using a vibrating sample magnetometer (VSM). The magnetic hysteresis (M-H) loop confirmed the superparamagnetic nature of pure CoFe 2 O 4 and a weak ferromagnetic behavior of Mn 2+ doped CoFe 2 O 4 samples with specific saturation magnetization in the range of 55.16 ± 24 and 66.92 ± 05 emu/g. All compositions of spinel Mn x Co 1−x Fe 2 O 4 samples were successfully tested as catalyst for the conversion of benzyl alcohol, which has resulted in 62.75 and 92.62 % conversion efficiency of CoFe 2 O 4 and Mn 0.5 Co 0.5 Fe 2 O 4 , respectively.

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Section: Diffuse Reflectance Spectroscopysupporting

confidence: 78%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

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“…The results indicate that the nanocrystalline ZnFe 2 O 4 calcined at 250 o C possesses high specific surface area (~ 152.3 m 2 g -1 ) and total pore volume (~ 0.14 cm 3 g -1 ) compared to those of as-prepared (SSA ~ 137.8 m 2 g -1 and TPV ~ 0.11 cm 3 g -1 ) and sample calcined at 350 o C (SSA ~ 143.6 m 2 g -1 and TPV ~ 0.12 cm 3 g -1 ). The specific surface area of the nanocrystalline ZnFe 2 O 4 synthesized in the present work is significantly higher than those obtained by co-precipitation [16], water-in-oil microemulsion [18], colloid mill-hydrothermal [20] and high-energy ball milling [48] methods, which are about 31.3 m 2 g -1 , 12 m 2 g -1 , 100.5 m 2 g -1 and 37.18 m 2 g -1 , respectively.…”

Section: Resultscontrasting

confidence: 60%

“…where hυ is the energy of the incident photon, K is the constant related to the material and n depends on the nature of band transition, i.e., n = 2 for allowed indirect and n = 1/2 for allowed direct transitions [48]. The (αhυ) 2 on the y axis versus energy of exciting light (hυ) on the x-axis is plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of nanocrystalline zinc ferrite spinel powders by homogeneous precipitation method

Sharma

Ghose

2015

Ceramics International

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“…3). The extended photoabsorption from UV to visible region of the ZnFe2O4, might be ascribed to additional sub band gap energy levels induced by the abundant surface and interface defects in the agglomerated nanoparticles [24]. …”

Section: Uv-drs Analysismentioning

confidence: 99%

Facile Synthesis of Spinel Nanocrystalline ZnFe2O4: Enhanced Photocatalytic and Microbial Applications

Suppuraj¹,

Thirunarayanan²,

Swaminathan³

et al. 2017

Materials Science and Applied Chemistry

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-Spinel ZnFe2O4 was developed successfully as a heterogeneous-Fenton catalyst for the degradation of Reactive Yellow 86 (RY 86) under UV light. The ZnFe2O4 was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM) and UV-diffuse reflectance spectroscopy (UV-DRS). FE-SEM reveals that the some of the particles sizes are in the range from 10 nm to 50 nm. The photocatalytic performance of ZnFe2O4 was evaluated by degradation of RY 86 dye solution under UV light. The degradation rate was highly influenced by pH, initial concentrations of H2O2 and catalyst concentration. The results indicated that ZnFe2O4 could be used as a photocatalyst for treatment of industrial coloured wastewater. The catalyst was reused for five consecutive runs without significant change in its activity. Moreover, the antibacterial effects were investigated.

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Optical absorption red and blue shifts in ZnFe2O4 nanoparticles

Cited by 120 publications

References 37 publications

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Synthesis and characterization of nanocrystalline zinc ferrite spinel powders by homogeneous precipitation method

Facile Synthesis of Spinel Nanocrystalline ZnFe2O4: Enhanced Photocatalytic and Microbial Applications

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