Role of surface defects in the third order nonlinear optical properties of pristine NiO and Cr doped NiO nanostructures

Menon, P. Soumya; Kunjumon, Jibi; Bansal, Manisha; Nair, Sutheertha S.; Beryl, C.; Vinitha, G.; Maity, Tuhin; Abraham, Priya Mary; Sajan, D.; Philip, Reji

doi:10.1016/j.ceramint.2022.10.301

Cited by 21 publications

(16 citation statements)

References 38 publications

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“…Another important feature of the 2 M band is its position, which has been associated with the correlation length related to the average range of the homogeneity of the crystal lattice 48 . As expected, the correlation length is responsive to the stoichiometry and defects density, among other parameters 48,52 . The red shift of the 2 M band has been related to a decrease in the correlation length 48 .…”

Section: Resultsmentioning

confidence: 59%

“…48 As expected, the correlation length is responsive to the stoichiometry and defects density, among other parameters. 48,52 The red shift of the 2 M band has been related to a decrease in the correlation length. 48 The aforementioned implies that a blue shift of the 2 M band may be linked to an increase in the correlation length, which can also be interpreted as a reduction in the density of point defects.…”

Section: Resultsmentioning

confidence: 99%

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On the properties of NiO powders obtained by different wet chemical methods and calcination

Alastuey,

Pais Ospina,

Comedi

et al. 2023

J Am Ceram Soc.

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NiO powders were synthesized using coprecipitation, sol‐gel, and hydrothermal synthesis methods. The powders were subjected to calcination in atmospheric air, followed by recalcination in an O2‐rich atmosphere at 800°C for 2 hours each. Characterization techniques such as scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray spectroscopy, and microRaman spectroscopy were utilized. The coprecipitation and hydrothermal methods resulted in disaggregated sub‐micrometric particles. The average size of particles obtained by coprecipitation method after calcination in atmospheric air and recalcination in O2‐rich atmosphere was 360 ± 140 nm and 400 ± 130 nm, respectively. Regarding the particles obtained by hydrothermal method, the average size was 190 ± 50 and 220 ± 80 nm for calcined in atmospheric air and recalcined in O2‐rich atmosphere, respectively. Conversely, the sol‐gel method produced particle aggregates with an average size of 430 ± 150 nm after calcination in atmospheric air and 500 ± 200 nm for calcination in O2‐rich atmosphere. X‐ray diffraction analysis revealed that only the hydrothermal method yielded pure NiO without additional Ni‐related phases, irrespective of the calcination procedure. In contrast, the coprecipitation sample exhibited a Ni2O3 phase after calcination in atmospheric air, which disappeared after recalcination in an O2‐rich atmosphere. The sol‐gel‐derived sample maintained a Ni phase after both calcination processes. Analysis of the crystallite size demonstrated an increase after recalcination in an O2‐rich atmosphere for the hydrothermal and sol‐gel derived samples, while a decrease was observed for the coprecipitation‐derived sample. Raman spectra exhibited defect‐enabled first‐order forbidden phonon modes that were sensitive to the synthesis route. The two magnon phonon modes also demonstrated dependency on the route, indicating variations in defect structures. Photocatalytic evaluation using methylene blue degradation in aqueous solutions indicated better performance for the powders recalcined in an O2‐rich atmosphere.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

On the properties of NiO powders obtained by different wet chemical methods and calcination

Alastuey,

Pais Ospina,

Comedi

et al. 2023

J Am Ceram Soc.

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“…By numerically fitting the Z-scan data to Equation 7, β eff and I s values of 1.31�10 À 9 m W À 1 and 1.80�10 11 W m À 2 , respectively, are obtained. The β eff value is high compared to several materials reported in the literature, [39][40][41][42] indicating that 1od is an excellent optical limiter for practical applications.…”

Section: Z-scan Studiesmentioning

confidence: 81%

Experimental and Theoretical Investigation of 3‐[(2‐chlorophenyl)diazenyl]pyridine‐2,6‐diamine as Optical Limiter

John,

Benny,

Philip

et al. 2023

ChemistrySelect

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Azobenzenes undergo reversible trans‐cis photoisomerization and have been extensively studied as photoresponsive material. In contrast, azopyridines have garnered relatively less attention despite their similar photochemistry. When compared to azobenzene, azopyridines offer more opportunities for material design through hydrogen bonding and coordination chemistry. Here, we report the isomerization for 3‐[(2‐chlorophenyl)diazenyl]pyridine‐2,6‐diamine (1od) through an integrative experimental and computational study. Notably, the energy barrier of 1od was significantly lower than that of previously reported azobenzenes. Moreover, we investigated and elucidated the photoisomerization pathway. 1od exhibited high nonlinear absorption, with a nonlinear absorption coefficient (βeff) of 1.31 10−9 m W−1, as determined by Z‐scan measurements. The results indicate that 1od has potential applications in optical limiters, which are used to fabricate protective eyewear and safeguard optical sensors from damage.

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“…For example, doping In 2 O 3 nanocrystals with Bi atoms creates Lewis acidic/basic Bi 3+ –O 2– pairs which enhance the adsorption and activation of CO 2 during photocatalytic hydrogenation . An important n-type semiconductor bismuth tungstate (Bi 2 WO 6 ) has shown an increased nonlinear absorption upon La doping due to the charge separation efficiency of photogenerated charge carriers . Doping La causes contraction in the Bi 2 O 3 lattice, and the defect sites present in the crystalline structure act as centers to reduce photogenerated electron–hole pair recombination.…”

Section: Oxide Nanomaterialsmentioning

confidence: 99%

“…Doping La causes contraction in the Bi 2 O 3 lattice, and the defect sites present in the crystalline structure act as centers to reduce photogenerated electron–hole pair recombination. An enhanced nonlinear absorption has also been seen in nanostructures of Cr-doped NiO (Ni 0.98 Cr 0.02 O) . The excellent nonlinear optical properties of the doped materials make them superior candidates for fabricating various optical devices.…”

Section: Oxide Nanomaterialsmentioning

confidence: 99%

The Huge Role of Tiny Impurities in Nanoscale Synthesis

Roy,

Healey,

Larm

et al. 2024

ACS Nanosci. Au

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Nanotechnology is vital to many current industries, including electronics, energy, textiles, agriculture, and theranostics. Understanding the chemical mechanisms of nanomaterial synthesis has contributed to the tunability of their unique properties, although studies frequently overlook the potential impact of impurities. Impurities can show adverse effects, clouding the interpretation of results or limiting the practical utility of the nanomaterial. On the other hand, as successful doping has demonstrated, the intentional introduction of impurities can be a powerful tool for enhancing the properties of a nanomaterial. This Review examines the complex role of impurities, unintentionally or intentionally added, during nanoscale synthesis and their effects on the performance and usefulness of the most common classes of nanomaterials: nanocarbons, noble metal and metal oxide nanoparticles, semiconductor quantum dots, thermoelectrics, and perovskites.

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Role of surface defects in the third order nonlinear optical properties of pristine NiO and Cr doped NiO nanostructures

Cited by 21 publications

References 38 publications

On the properties of NiO powders obtained by different wet chemical methods and calcination

On the properties of NiO powders obtained by different wet chemical methods and calcination

Experimental and Theoretical Investigation of 3‐[(2‐chlorophenyl)diazenyl]pyridine‐2,6‐diamine as Optical Limiter

The Huge Role of Tiny Impurities in Nanoscale Synthesis

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