Effect of thermal annealing on structural, linear and nonlinear optical properties of 1, 4, 5, 8-naphthalene tetracarboxylic dianhydride thin films

Abdel-Khalek, H.; Shalaan, E.; Salam, Mustafa Abdul; El-Sagheer, Aida M.; El-Mahalawy, Ahmed M.

doi:10.1016/j.molstruc.2018.10.058

Cited by 31 publications

(11 citation statements)

References 75 publications

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“…On the other hand, it has been also reported that the crystalline size and oxygen vacancies defects have a significant effects on the E g of ZnO. Anyhow, ZnO is usually characterized by the structure disorder and usually contains some of defects which produce some of localized blocked states [ 82 , 83 ]. So, we believe that these defects are higher for (Fe + Cu) samples, and therefore E g was increased.…”

Section: Resultsmentioning

confidence: 99%

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

et al. 2021

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We report here a considered novel study on the structural, FTIR spectra and optical properties of pure and co-doped Zn 0.90- x Fe 0.1 M x O with ((M = Cu, Ni and ( x = 0.00, 0.10) and (0.00 < y < 0.20)) at different sintering temperatures T s ( T s = 850 °C for series I and 1000 °C series II). Although the ZnO wurtzite structure is conformed for all samples, some secondary lines with little intensity are formed. But the number of these lines is higher for series I than for series II. The ( c / a ) value and U -parameter are almost constant for all samples, while Zn–O bond length L is slightly increased. The porosity and crystallite size are decreased by Fe, and also for (Fe + Cu) samples, and their values for series I are lower than for series II. The residual stress is tensile for most samples. Interestingly, the Young’s, rigid and bulk modulus, Poisson’s ratio and Debye temperature, obtained from FTIR analysis, are increased by Fe addition with a further increase for Fe + Ni) samples for both series. A ductile nature is obtained for pure, Fe and (Fe + Cu) samples; whereas a brittle nature is approved for (Fe + Ni) samples. On the other hand, the energy gap ( E g ), residual lattice dielectric constant ( ε L ) and carrier density N are increased by Fe addition, followed by a further increase for (Fe + Cu) samples, while the vice is versa for the inter-atomic distance R . For example, E g was increased from 3.153 eV for pure ZnO to 3.974 eV for (Fe + Cu) samples (i.e., 0.821 eV more), while it was decreased to 2.851 eV for (Fe + Ni) samples (i.e., 0.302 eV less). A direct behavior is obtained between E g and both elastic modulus ( Y , β ), lattice and micro strains ( ε L , ε m ) , dislocation density ( δ ), residual stress ( σ ) and carrier density N, whereas a reverse behavior is obtained between E g and both crystallite size ( D ), porosity (PS) and inter-atomic distance ( R ) . These results are explained in terms of the generated blocked states of the conduction band as indicated by the Burstein Moss effect. These novel findings reveal that the co-doping has intense ZnO and moderate metal oxide modes in the ZnO matrix structure, which makes ZnO co-doped with (Fe + Cu) more suitable for gas sensors and optoel...

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Section: Resultsmentioning

confidence: 99%

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

et al. 2021

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“…For ZnO nanoparticles the values of Egh and Egl are 4.07, 3.95, 3.5, 3.25 eV and 1.05, 1, 1.55, 2.1 eV respectively. This suggests a decline in Egh, while Egl is increased as the Ts rise to 1200 o C. Two optical energy gaps, however, are also recorded for semiconductors of the form n [77][78][79][80]. In principle, this can be interpreted as follows in terms of the conduction shape and valence bands.…”

Section: 3-optical Measurements and Energy Gapmentioning

confidence: 98%

Electrical, photoluminescence and optical investigation of ZnO nanoparticles sintered at different temperatures

et al. 2021

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“…These new peaks are assigned to vibrational modes associated with the carbonyl groups (n C]Osym and n C-O-C + d C-H + d ring ) of the NTCDA molecular layer, respectively. 35 Both of these peaks are shied to lower vibrational frequency, relative to pure samples of NTCDA. Such a change in vibrational frequency is indicative of a redistribution of electron density as a consequence of interactions between the two components of the heterojunction.…”

Section: Characterizationmentioning

confidence: 98%

1,4,5,8-Naphthalene tetracarboxylate dianhydride/g-C₃N₄ van der Waals heterojunctions exhibit enhanced photochemical H₂O₂ production and antimicrobial activity

et al. 2021

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Effect of thermal annealing on structural, linear and nonlinear optical properties of 1, 4, 5, 8-naphthalene tetracarboxylic dianhydride thin films

Cited by 31 publications

References 75 publications

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

Electrical, photoluminescence and optical investigation of ZnO nanoparticles sintered at different temperatures

1,4,5,8-Naphthalene tetracarboxylate dianhydride/g-C₃N₄ van der Waals heterojunctions exhibit enhanced photochemical H₂O₂ production and antimicrobial activity

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Effect of thermal annealing on structural, linear and nonlinear optical properties of 1, 4, 5, 8-naphthalene tetracarboxylic dianhydride thin films

Cited by 31 publications

References 75 publications

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

Electrical, photoluminescence and optical investigation of ZnO nanoparticles sintered at different temperatures

1,4,5,8-Naphthalene tetracarboxylate dianhydride/g-C3N4 van der Waals heterojunctions exhibit enhanced photochemical H2O2 production and antimicrobial activity

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1,4,5,8-Naphthalene tetracarboxylate dianhydride/g-C₃N₄ van der Waals heterojunctions exhibit enhanced photochemical H₂O₂ production and antimicrobial activity