The role of defects on linear and nonlinear optical properties of pristine and nickel doped zinc oxide nanoparticles

Menon, P. Soumya; Anjana, M.P.; Jose, Ayona K; Kunjumon, Jibi; A, Aleena P.; Chandran, Saji; George, M. C.; Vinitha, G.; Sajan, D.

doi:10.1016/j.surfin.2022.102393

Cited by 14 publications

(6 citation statements)

References 69 publications

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“…The crystalline size of the powdered samples was estimated from the XRD peak using the Scherrer formula [72] …”

Section: Methodsmentioning

confidence: 99%

The synergistic impact of multi walled carbon nanotubes on microstructural, morphological, and optical properties of polyaniline films

Mathew,

Radhakrishnan,

Pragash

et al. 2024

ChemistrySelect

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Nanocomposite of polyaniline (PANI) and multi walled carbon nanotube (MWCNT) was synthesised by ex‐situ solution mixing process in the N‐Methyl‐2‐Pyrrolidinone (NMP) solvent medium by varying the concentration of MWCNT in the PANI matrix. PANI‐MWCNT composite films were prepared by the drop casting method. The morphology, structure and chemical composition of PANI and PANI‐MWCNT nanocomposites were characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x‐ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT‐IR) spectra. The experimental findings suggested a favourable synergy between PANI and MWCNTs. PANI‐MWCNT nanocomposite formed as randomly oriented nanofibrous clusters was confirmed, and the bandgap of the composites was found to be gradually decreased with the increase in concentration of MWCNT in the PANI matrix. The calculation of crystallinity index, crystallite size, average d‐spacing, dislocation density, lattice strain, and inter chain separation of the samples were conducted by XRD analysis. When the MWCNT concentration increased from 0.05 % w/v to 0.5 % w/v, a rise in the degree of crystallinity from 3.39 % to 52.46 %, dislocation density from 0.03315×10−3(nm−2)to 0.07133×10−3 (nm−2) and lattice strain from 8.6821×10−3 to 12.9843×10−3, accompanied by a reduction in both crystallite size and inter‐chain separation were observed .The microcrystalline behaviour and crystalline orientation of the PANI‐MWCNT composites were correlated with the bandgap studies. The composite formation improved the thermal stability of PANI. The co‐relation between the crystallinity parameters and fine tuning of optical bandgap and the control over the defect levels were done in this study. This synergy suggests that these composites are suitable candidates for linear and nonlinear optical (NLO) applications.

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“…The crystalline size of the powdered samples was estimated from the XRD peak using the Scherrer formula [72] …”

Section: Methodsmentioning

confidence: 99%

The synergistic impact of multi walled carbon nanotubes on microstructural, morphological, and optical properties of polyaniline films

Mathew,

Radhakrishnan,

Pragash

et al. 2024

ChemistrySelect

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“…Since there is a direct relation between the emission and the temperature, the charge transfer mechanism and the level of defects, knowledge of these parameters is significant. 49,50 Fig. 8 Variation of skin depth with respect to photon energy.…”

Section: Photoluminescence Analysismentioning

confidence: 99%

“…In addition, the transfer of charges within and among the cation and anion also contributes to the red shift. 50,51 The difference in wavelength between the absorption maximum (Fig. 9(a)) and emission maximum in the same electronic transition gives rise to either a Stokes shift or anti-Stokes shift.…”

Section: Photoluminescence Analysismentioning

confidence: 99%

Experimental and theoretical exploration of the new stilbazolium-family single crystal grown by the integration of a novel anion for optical limiting and optoelectronic applications

Anand,

Usha Rani

2024

Mater. Adv.

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“…19,20 For example, defects such as zinc interstitials and oxygen vacancies enhanced third-order nonlinear parameters and optical response of Zn (1−x) Ni x O nanoparticles and ZnO thin films. 21,22 Functional defects such as oxygen vacancies have been used to manipulate and tailor crystal structures, which provides more flexibility to control and enhance materials' properties. Specifically, oxygen vacancies in compounds with lone pairs can change the chemical environment around the atom, distorting the crystal structure and dipole orientations and varying the polarization responses.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Oxygen vacancies are one of the most common defects formed during the synthesis of metal oxides − and can have profound effects on material properties. The combination of lone pairs and vacancies is known to affect crystal structures and their optical and physical properties. , For example, defects such as zinc interstitials and oxygen vacancies enhanced third-order nonlinear parameters and optical response of Zn (1– x ) Ni x O nanoparticles and ZnO thin films. , Functional defects such as oxygen vacancies have been used to manipulate and tailor crystal structures, which provides more flexibility to control and enhance materials’ properties. Specifically, oxygen vacancies in compounds with lone pairs can change the chemical environment around the atom, distorting the crystal structure and dipole orientations and varying the polarization responses.…”

Section: Introductionmentioning

confidence: 99%

Stereochemically Active Lone Pairs: Unraveling the Electronic Origin of Dielectric Response in Nonlinear Optical TeO₂

Nguyen,

Macaluso,

Huda

2024

J. Phys. Chem. C

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Tellurite glasses have emerged as a promising candidate for nonlinear optics (NLO) due to their high refractive index and third-order optical susceptibility (χ 3 ). In this work, we focus on the electronic structure of crystalline TeO 2 , a precursor to numerous TeO 2 -based glasses. All three crystalline TeO 2 polymorphs are wide-gap semiconductors and have electronic contributions from the Te 4+ 5s 2 lone pairs near the Fermi level, which affect optical properties. Based on the formation energies, the formation of oxygen vacancies is strongly favorable during synthesis. Introduction of an oxygen vacancy induces notable changes in the chemical environment in the pristine α-TeO 2 structure and the response of the Te 5s 2 lone pairs. Comparative analysis to the measured refractive indices and static dielectric constant (a second-rank tensor) shows that the calculated values of α-TeO 2 with the presence of an oxygen vacancy (α-TeO 2 :O v ) agree well with experimental data. The high distortion index and stereochemical activity ratio of α-TeO 2 :O v contribute to its polarizable asymmetric electron density. High polarization and faster orientation of the dipoles in α-TeO 2 with the presence of an oxygen vacancy make it an excellent NLO material for ultrafast optical switch applications. This study can help to guide design principles and improve our understanding of the electronic origin of NLO materials containing lone pairs.

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The role of defects on linear and nonlinear optical properties of pristine and nickel doped zinc oxide nanoparticles

Cited by 14 publications

References 69 publications

The synergistic impact of multi walled carbon nanotubes on microstructural, morphological, and optical properties of polyaniline films

The synergistic impact of multi walled carbon nanotubes on microstructural, morphological, and optical properties of polyaniline films

Experimental and theoretical exploration of the new stilbazolium-family single crystal grown by the integration of a novel anion for optical limiting and optoelectronic applications

Stereochemically Active Lone Pairs: Unraveling the Electronic Origin of Dielectric Response in Nonlinear Optical TeO₂

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The role of defects on linear and nonlinear optical properties of pristine and nickel doped zinc oxide nanoparticles

Cited by 14 publications

References 69 publications

The synergistic impact of multi walled carbon nanotubes on microstructural, morphological, and optical properties of polyaniline films

The synergistic impact of multi walled carbon nanotubes on microstructural, morphological, and optical properties of polyaniline films

Experimental and theoretical exploration of the new stilbazolium-family single crystal grown by the integration of a novel anion for optical limiting and optoelectronic applications

Stereochemically Active Lone Pairs: Unraveling the Electronic Origin of Dielectric Response in Nonlinear Optical TeO2

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Product

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Stereochemically Active Lone Pairs: Unraveling the Electronic Origin of Dielectric Response in Nonlinear Optical TeO₂