Band gap engineering in PbO nanostructured thin films by Mn doping

Suryawanshi, V. N.; Varpe, Ashwini S.; Deshpande, Mukund

doi:10.1016/j.tsf.2017.10.016

Cited by 38 publications

(31 citation statements)

References 24 publications

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“…where (B) is a constant, ðvÞ is the frequency, (h) is Planck's constant, ðE g Þ is the phonon energy, and (n) is the constant of the exponential, which depends on the transition type; r could represent in many values as 1/2 and 3/2 or 2 and 3 for the direct allowed and forbidden or indirect allowed and bidden, respectively. 38,39 The index of refractive (n) is calculated according to the equations as well as the coefficient of extinction (k) 38 n…”

Section: Theoretical Partmentioning

confidence: 99%

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New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

Kadhim

Al‐Bermany

2021

Journal of Composite Materials

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Graphene oxide nanosheets (GO) bring more interest in the tunable bandgap and enhanced the optical properties of nanocomposites. The developed method successfully mixed the PMMA- dissolved in dimethylformamide (DMF) with PVA dissolved in distilled water (DW) and DMF. New (PMMA-DMF)-(PVA-DW-DMF)/GO nanocomposite was successfully fabricated with various loading ratios of GO nanosheets for the first time. Several factors were applied to get fine desperation and homogeneous using the acoustic-solution casting method. Optical Microscope (OM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV–visible spectrophotometer were applied to investigate the structure and optical properties of the PMMA-PVA-GO nanocomposite. The OM images confirmed the fine homogenous matrix and GO distribution in the nanocomposites. FTIR spectra exhibited the most functional group of polymers and GO in the nanocomposites and strong interfacial interaction between the GO and matrix as confirmed by the shifting in the XRD patterns of the PMMA. The optical properties results of the PMMA-PVA/GO nanocomposites revealed an improvement up to 400% of the absorbance, 337% of the absorption coefficient, 51% of the refractive index, 210% of the real and 125% of the imaginary dielectric constants in terms to increase the GO concentrations, whereas the reduction in the transmittance and energy bandgap results of allowed and forbidden indirect transition were exhibited up to 9 and 16.4%, respectively. These results could grow for better and wide applications such as radiation shielding, specific optoelectronic applications, and filters ultraviolet also could use in landfilling the chemical, nuclear, and radioactive waste.

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Section: Theoretical Partmentioning

confidence: 99%

“…At optical frequencies, it is characterized by the waves of the light, where the electronic polarity is considered as dominating above all other remaining polarization types. Equations ( 7) to ( 9) are used to characterize the constant of both real and imaginary dielectric 39,40 e ¼ e r þ e i ð Þ (7)…”

Section: Theoretical Partmentioning

confidence: 99%

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

Kadhim

Al‐Bermany

2021

Journal of Composite Materials

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“…The synthesis of PbO can be carried out by chemical or physical routes. Thermal decomposition of lead precursors [8], spray pyrolysis [9], sonochemical [10], and electrochemical [11] methods have been applied for the synthesis of PbO. However, this process has several drawbacks.…”

Section: Introductionmentioning

confidence: 99%

SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY, PROPERTIES

Putri

Saputra

Saputro

et al. 2021

jsmi

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SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY PROPERTIES. The α-PbO nanocrystals were successfully decorated using sodium laureth sulfate (SLS) anionic surfactant. The method used is one-pot synthesis approach. The precursor used is lead nitrate (Pb(NO3)2). The UV-Vis spectrophotometer showed the absorption peak of α-PbO nanocrystals was seen at wavelength of 237 nm and an absorbance value of 0.7. The optical properties of PbO nanocrystals can be seen at the bandgap value of 4.2 eV. FT-IR spectroscopy showed the shift of absorption peak at the wavenumber of 1358 cm-1. XRD spectroscopy showed the crystals of PbO at diffraction angles (2θ) of 10-80o: 29.17, 32.54, 37.85, 39.62, 45.16, 46.21, 56.12, and 61.73 with miller indices of (111), (200), (201), (121), (220), (030), (311), and (032), respectively. The crystal size average of PbO was 56.32 nm. The results of PSA and PZC shows the particle size distribution of PbO is 71.5 nm with inter-particle charge of -25 mV. SEM-EDX data shows the PbO nanocrystals have an irregularly spherical with a compounds composition of Pb (83.12%) and O (16.88%). From the data of characterization, it can be concluded the PbO nanocrystals was successfully decorated using the surfactant anionic of sodium laureth sulfate.

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“…Recent theoretical and experimental studies have suggested the use of lead oxides as earth-abundant compounds for photovoltaic cells owing to their remarkable optical and electronic properties [23,24], showing large absorption cross sections and large carrier mobilities. The design of photovoltaic cells depends on materials' band gaps [25][26][27], which justifies additional studies [28,29].…”

Section: Introductionmentioning

confidence: 99%

Annealing effect on the optical and photoelectrochemical properties of lead oxide

Zerguine

Abdi

Habelhames

et al. 2018

Eur. Phys. J. Appl. Phys.

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Effect of the annealing oxidation time of electrodeposited lead (Pb) on the phase formation of lead oxide (PbO) films is reported. The phase structure, optical properties, size and morphology of the films were investigated by scanning electron microscopy, X-ray diffraction and UV-vis spectroscopy. The relationship between structur and photoelectrochemical properties was investigated. Thin films of PbO produced via air annealing of electrodeposited lead consist of a mixture of two phases, orthorhombic (o-PbO) and tetragonal (t-PbO), that determine the material properties and effectiveness as absorber layer in a photoelectrochemical device. The proportion of tetragonal t-PbO increases for longer heat treatments. After 40 h, the sample consists mainly of tetragonal t-PbO. The p-type semiconducting behavior of lead oxide was studied by photocurrent measurements. Different heat treatments yield variations in the ratio of tetragonal to orthorhombic lead oxide that effect on device performances, where devices with a higher content of tetragonal t-PbO show higher photocurrent than with the orthorhombic phase.

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Band gap engineering in PbO nanostructured thin films by Mn doping

Cited by 38 publications

References 24 publications

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

New fabricated PMMA-PVA/graphene oxide nanocomposites: Structure, optical properties and application

SODIUM LAURETH SULFATE (SLS) DECORATED α-PbO NANOCRYSTALS: OPTICAL, STRUCTURE, AND MORPHOLOGY, PROPERTIES

Annealing effect on the optical and photoelectrochemical properties of lead oxide

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