Structure, optical and electrochromic properties of NiO thin films

Sawaby, A.; Selim, M.M.; Marzouk, Samir Y.; Mostafa, Merna; Hosny, Ahmed

doi:10.1016/j.physb.2010.05.015

Cited by 117 publications

(34 citation statements)

References 23 publications

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“…The extinction coecient (k) is correlated with the absorption coecient (α) by the relation k = αλ/4π. The optical band gap for the studied lms can be determined as described elsewhere [11]. The values of E g for the studied lms are higher than ones reported in the literature [7] (0.35 eV) and are lower than ones obtained by Ubale and Bargal [10] (0.92 eV).…”

Section: Optical Properties Of Ni 2 S 2−x Thin Lmsmentioning

confidence: 70%

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Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films

2015

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Ni2S2−x thin lms with x = 0, 0.5, and 1 were prepared by chemical bath deposition technique. Amorphous structure was discovered by XRD for x = 1, while α-Ni7S6 and NiS phases were discovered for x = 0, and x = 0.5 respectively. SEM graphs of the studied lms have conrmed the XRD results. Optical band gap values increase from 0.845 to 0.912 eV, with increase of the composition x from 0 to 1. Activation energy values increase in the range from x = 0 to x = 0.5 and does not change for x = 1.

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Section: Optical Properties Of Ni 2 S 2−x Thin Lmsmentioning

confidence: 70%

“…3a. In order to determine the optical band gap (E g ) and the other optical constants [11] for all lms the absorption coecient (α) should be calculated from the expression:…”

Section: Optical Properties Of Ni 2 S 2−x Thin Lmsmentioning

confidence: 99%

Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films

2015

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“…It is clearly seen from the figure that the absorption coefficient tends to decrease exponentially as the wavelength increases. This behaviour is typical for many semiconductors and can occur for a variety of reasons, such as internal electric fields within the crystal, deformation of lattice due to strain caused by imperfection and inelastic scattering of charge carriers by phonons [16][17][18]. The absorbance of CuO sample synthesized with propanol solvent shows faster exponential decrease indicating more strain generation in this case.…”

Section: Uv-visible Characterization Of Cuo Nanoparticlementioning

confidence: 81%

Structure, Microstructure and Optical Absorption Analysis of CuO Nanoparticles Synthesized by Sol-Gel Route

Mallick¹,

Sahu²

2012

106

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We report the synthesis of CuO nanoparticles using different solvents by a low cost sol-gel route. Evolution of structure, microstructure and optical absorption analysis of these nanoparticles were studied using X-ray diffraction (XRD) and UV-Visible spectrophotometer. XRD analysis indicated that the crystallite size and strain are higher for the CuO nanoparticle synthesized using propanol as solvent. Optical absorption analysis indicated the red shift of indirect band gap and the blue shift of direct band gap. In the present case, red shift is associated with the formation of surface defects whereas the blue shift is due to the quantum confinement effect seen for nanoparticle systems.

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“…It is possible that, due to aggregation and agglomeration, particle size increases and material settled down on the bottom of container causing decrease in the absorbance 43 . This behavior is typical for many semiconductors due to internal electric fields within the crystal and inelastic scattering of charge carriers by phonons 44,45 . Absorption coefficient (α) associated with the strong absorption region of the sample was calculated from absorbent (A) and the sample thickness (t) was used the relation: …”

Section: Uv-visible Spectroscopymentioning

confidence: 92%

Structural and Optical Characterization of ZnO Nanoparticles Synthesized by Microemulsion Route

Kumar

Rani

2013

ILCPA

243

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ZnO nanoparticles were synthesized by microemulsion route in W/S ratio of 5 at room temperature. X-ray diffraction (XRD) pattern reveals wurtzite structure of ZnO nanoparticles. Rod shape of ZnO nanoparticles of average particle size 10.0 to 12.0 nm were observed by transmission electron microscopy. FT-IR spectra confirmed the adsorption of surfactant molecules at the surface of ZnO nanoparticles and presence of Zn-O bonding. Thermal studies were carried out by the differential scanning calorimeter (DSC) techniques. In addition, UV-Visible spectra were employed to estimate the band gap energy of ZnO nanoparticles.

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Structure, optical and electrochromic properties of NiO thin films

Cited by 117 publications

References 23 publications

Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films

Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films

Structure, Microstructure and Optical Absorption Analysis of CuO Nanoparticles Synthesized by Sol-Gel Route

Structural and Optical Characterization of ZnO Nanoparticles Synthesized by Microemulsion Route

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