Tailoring the optical and physical properties of La doped ZnO nanostructured thin films

Ahmed, M.M.; Tawfik, Wael Z.; Elfayoumi, M.A.K.; Abdel-Hafiez, M.; El-Dek, S.I.

doi:10.1016/j.jallcom.2019.03.340

Cited by 53 publications

(15 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ionic radius of Cs + (272 pm) is higher than that of Na + (191 pm) and Li + (76 pm). Also, using the crystallographic plane indices (hkl), the a and c lattice constants, interplanar distance (d), the volume of the unit cell (V), dislocation constant (δ), the bond length (L), and the strain (∈) are also calculated by Equations ) and shown in Table 1 36‐39

normald = normalλ / 2 sinθ

\frac{1}{normald} = \sqrt{\frac{4}{3} ((), \frac{{normalh}^{2} + {normalk}^{2} + h k}{a^{2}}) + \frac{{normall}^{2}}{{normalc}^{2}} false]}

normalV = \frac{\sqrt{3}}{2} a^{2} normalc

normalL = \sqrt{false(\frac{{normala}^{2}}{3} + {(\frac{1}{2} - u)}^{2} c^{2}} and normalU = ((), \frac{1}{3}) ((), \frac{a 2}{c^{2}}) + \frac{1}{4}

normalδ = D^{- 2}

normal∈ = 0.25 normalβ \cot normalθ

…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

et al. 2020

View full text Add to dashboard Cite

This study investigated the structural, morphological, and optical absorption of three separate perovskites (NaPbI 3 , CsPbI 3 , and LiPbI 3) developed by a lowcost and massive hydrothermal production technique. For all samples, X-ray diffraction (XRD) measurement demonstrated the growth of perovskites in the hexagonal phase along (002) orientation. From the scanning electron microscope (SEM) analyses, the perovskites have mixed morphologies between nano/micro rods and nano/microdiscs. In the visible field, NaPbI 3 demonstrated stronger light absorption than CsPbI 3 and LiPbI 3. The prepared perovskites were tested under visible light as working electrodes for water splitting reactions using Na 2 S 2 O 3 electrolyte. With 2.76% at 405 nm, the NaPbI 3 perovskite photoelectrode in accordance with its optical properties showed the highest incident photon-to-current efficiency (IPCE) among the studied perovskites. Also, the NaPbI 3 perovskite demonstrated higher PEC performance with an H 2 production rate of 38 μmolh −1 cm −2 than many other reported perovskites. The studied perovskites have high stability and reproductivity for the photoelectrochemical H 2 production.

show abstract

normald = normalλ / 2 sinθ

\frac{1}{normald} = \sqrt{\frac{4}{3} ((), \frac{{normalh}^{2} + {normalk}^{2} + h k}{a^{2}}) + \frac{{normall}^{2}}{{normalc}^{2}} false]}

normalV = \frac{\sqrt{3}}{2} a^{2} normalc

normalL = \sqrt{false(\frac{{normala}^{2}}{3} + {(\frac{1}{2} - u)}^{2} c^{2}} and normalU = ((), \frac{1}{3}) ((), \frac{a 2}{c^{2}}) + \frac{1}{4}

normalδ = D^{- 2}

normal∈ = 0.25 normalβ \cot normalθ

…”

Section: Resultsmentioning

confidence: 99%

“…Also, using the crystallographic plane indices (hkl), the a and c lattice constants, interplanar distance (d), the volume of the unit cell (V), dislocation constant (δ), the bond length (L), and the strain (∈) are also calculated by Equations (3)-(8) and shown in Table 1. [36][37][38][39] d = λ=2 sinθ ð3Þ…”

Section: Structural Propertiesmentioning

confidence: 99%

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

et al. 2020

View full text Add to dashboard Cite

show abstract

“…For RW0.03, there are three peaks of Sr11Mg2Si10, located at 2θ = 29.59°, 30. The angle of X-ray diffraction is inversely related to the interplanar distance according to Bragg's equation: [61][62][63][64] m λ = 2 d sin θ…”

Section: Xrd Structure Analysismentioning

confidence: 99%

Fabrication and Characterization of Nanostructured Rock Wool as a Novel Material for Efficient Water-Splitting Application

et al. 2022

View full text Add to dashboard Cite

Rock wool (RW) nanostructures of various sizes and morphologies were prepared using a combination of ball-mill and hydrothermal techniques, followed by an annealing process. Different tools were used to explore the morphologies, structures, chemical compositions and optical characteristics of the samples. The effect of initial particle size on the characteristics and photoelectrochemical performance of RW samples generated hydrothermally was investigated. As the starting particle size of ball-milled natural RW rises, the crystallite size of hydrothermally formed samples drops from 70.1 to 31.7 nm. Starting with larger ball-milled particle sizes, the nanoparticles consolidate and seamlessly combine to form a continuous surface with scattered spherical nanopores. Water splitting was used to generate photoelectrochemical hydrogen using the samples as photocatalysts. The number of hydrogen moles and conversion efficiencies were determined using amperometry and voltammetry experiments. When the monochromatic wavelength of light was increased from 307 to 460 nm for the manufactured RW>0.3 photocatalyst, the photocurrent density values decreased from 0.25 to 0.20 mA/mg. At 307 nm and +1 V, the value of the incoming photon-to-current efficiency was ~9.77%. Due to the stimulation of the H+ ion rate under the temperature impact, the Jph value increased by a factor of 5 when the temperature rose from 40 to 75 °C. As a result of this research, for the first time, a low-cost photoelectrochemical catalytic material is highlighted for effective hydrogen production from water splitting.

show abstract

“…The obtained values of the d-spacing are further used to estimate lattice parameters 'c' and 'a' [22] using the relations ) + (…”

Section: Structural and Morphological Studiesmentioning

confidence: 99%

“…The obtained values of the lattice parameters 'a' and 'c' are further used to estimate the volume of the unit cell [22] using the relation…”

Section: Structural and Morphological Studiesmentioning

confidence: 99%

Fabrication of n-ZnO/p-Si++ Hetero-junction Devices for Hydrogen Detection: Effect of Annealing Temperature

Kumar

Rawal

Kumar

2021

Preprint

View full text Add to dashboard Cite

In the present study, we reports the fabrication of n-ZnO/p-Si++ hetero-junction devices for the detection of hydrogen leakage in ambient air environment. For the fabrication of n-ZnO/p-Si++ hetero-junction devices, high quality ZnO thin films are grown by controlled thermal evaporation technique on the highly doped p-type silicon substrates at 400 oC. The two sets of films deposited at 400 o C are further annealed at 500 and 600 oC to examine the effect of annealing temperature on the structural, morphology, electrical and gas sensing properties of the deposited films. It is revealed from the x-ray diffraction studies that the crystallite size, and the density of the films increase from 22.55 to 24.95 nm, from 5.65 to 5.68 g/cm3, respectively, on increasing the fabrication temperature from 400 to 600 oC. In contrast to it, the grain boundary specific surface area decrease from 8.79 x107 to 7.88 x107 m-1 on changing the fabrication temperature from 400 to 600 oC. The hydrogen gas sensing response of the fabricated devices has also been recorded at different operating temperatures and different hydrogen concentrations (200 to 1000ppm) in air ambient. It is found that the gas sensing response of the fabricated devices increase with increase in operating temperature (up to 100 oC) and decease beyond this temperature. The gas sensing responses of the devices fabricated at 400, 500 and 600 oC are found to be 97.22, 64.23 and 40.77 % at 1000 ppm of hydrogen. A decrease in gas sensing response with fabrication temperature is attributed to the increase in crystallite size (quantum size effect), density of films (i.e. lower penetration) and decrease in grain boundary specific surface area (i.e. active sites) with annealing temperature. The mechanism of the gas sensing in these devices has also been systematically analyzed under different models.

show abstract

Tailoring the optical and physical properties of La doped ZnO nanostructured thin films

Cited by 53 publications

References 50 publications

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

Fabrication and Characterization of Nanostructured Rock Wool as a Novel Material for Efficient Water-Splitting Application

Fabrication of n-ZnO/p-Si++ Hetero-junction Devices for Hydrogen Detection: Effect of Annealing Temperature

Contact Info

Product

Resources

About

Tailoring the optical and physical properties of La doped ZnO nanostructured thin films

Cited by 53 publications

References 50 publications

Efficient photoselectrochemical hydrogen production utilizing of APbI 3 (A = Na, Cs, and Li) perovskites nanorods

Efficient photoselectrochemical hydrogen production utilizing of APbI 3 (A = Na, Cs, and Li) perovskites nanorods

Fabrication and Characterization of Nanostructured Rock Wool as a Novel Material for Efficient Water-Splitting Application

Fabrication of n-ZnO/p-Si++ Hetero-junction Devices for Hydrogen Detection: Effect of Annealing Temperature

Contact Info

Product

Resources

About

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods