Morphology dependent nanosecond and ultrafast optical power limiting of CdO nanomorphotypes

Thomas, Polly; Sreekanth, P.S. Rama; Philip, Reji; Abraham, K. E.

doi:10.1039/c5ra04282h

Cited by 36 publications

(12 citation statements)

References 36 publications

(30 reference statements)

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“…The presence of layer like CuFe 2 O 4 nanoplatelets upon the layer rGO offers higher advantage in enhancing the nonlinear absorption coefficient. As discussed in the literature, similar tuning of NLO properties with respect to the grain size of the material was observed in CuCl nanocrystals, ZnO nanocolloids, ZnFe 2 O 4 and CdO[61][62][63]. The decoration of copper ferrite with different concentrations upon rGO sheets with varied morphology results in acquiring tunability of NLO properties.…”

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confidence: 72%

Femtosecond nonlinear absorption and optical limiting action in nanoplatelet CuFe2O4-decorated rGO nanocomposites

2019

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Using 800 nm infrared, 150 femtosecond (fs), 80 MHz high repetition rate laser pulse excitation, intensity-dependent (I o = 245-735 MW/cm 2) measurements on the nonlinear absorption of copper ferrite hetero-architecture functionalized with three rGO contents (15, 25 and 40 wt%) were performed. Copper ferrite-rGO nanocomposite demonstrated a peculiar W-pattern [a peak (saturable absorption) with two valleys [reverse saturable absorption (RSA)] at extreme] in the open aperture Z-scan data for the decorated (15 wt%) rGO systems recorded at a low peak intensity (I o = 245 MW/cm 2). The Z-scan traces were dominated by RSA characteristics due to two-photon absorption process at high peak intensities. The variation in intensity-dependent nonlinear absorption coefficient and ground-state absorption at laser excitation wavelength revealed the presence of excited-state absorption (ESA). The maximum two-photon absorption coefficient was recorded for CuFe 2 O 4-(40 wt%) rGO at 735 MW/cm 2 excitation, which is attributed to the combined contribution of rGO and CuFe 2 O 4 that is four times higher than pure rGO and CuFe 2 O 4. The presence of layer like CuFe 2 O 4 nanoplatelets upon the layer-structured rGO offers an added advantage in enhancing the nonlinear absorption coefficient. Near-resonant ESA-based optical limiters comprising CuFe 2 O 4-rGO can possibly be used as a versatile optical limiting material for eye safety against intense, high repetition rate fs laser pulses.

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confidence: 72%

Femtosecond nonlinear absorption and optical limiting action in nanoplatelet CuFe2O4-decorated rGO nanocomposites

2019

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“…14 In addition to this we have evidently proved that the size dimension of CdO nanomorphotypes increases as morphology changes from spherical to flakes and to parallelepiped shape whereas, the surface to volume ratios decreases with increase in particle size dimensions. 14 The exact reason for change in the dielectric constant behavior with morphology is not clearly understood. However, we explain the dependency of morphology on dielectric behavior of nanomaterials on the basis of particle size dimension as well as surface to volume ratios.…”

Section: Dielectric Polarization and Relaxationmentioning

confidence: 84%

“…14 We have also reported on theoretical and experimental grounds that spherical nanomorphology have maximum surface to volume ratio compared to that of CdO flakes and parallelepiped morphology. 14 In addition to this we have evidently proved that the size dimension of CdO nanomorphotypes increases as morphology changes from spherical to flakes and to parallelepiped shape whereas, the surface to volume ratios decreases with increase in particle size dimensions. 14 The exact reason for change in the dielectric constant behavior with morphology is not clearly understood.…”

Section: Dielectric Polarization and Relaxationmentioning

confidence: 99%

“…14 In brief, the chemical precipitation method is used for synthesizing the spherical nanomorphotype. The solutions of reactants in double distilled water are prepared in 1:1 ratio.…”

Section: Synthesis Of Cdo Nanomorphotypesmentioning

confidence: 99%

“…14 For electrical analysis, the prepared powder samples are pelletized at a pressure of 2.5 tons for 5 min using a KBr hydraulic press. The pellet is then sintered at temperature of 400 C for 10 h for densification to avoid the voids/air traps between the grains/grain boundaries.…”

Section: Analysis Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Morphology-dependent space charge polarization and dielectric relaxation of CdO nanomorphotypes

Thomas¹,

Abraham²

2016

J. Adv. Dielect.

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A versatile approach signifying the morphology-dependent dielectric polarization and relaxation mechanisms of cadmium oxide (CdO) nanosphere, nanoflakes and nanoparallelepiped morphotypes as a function of frequency and temperature is presented. Variation of dielectric property is observed due to the changes of space charge/interfacial polarization resulting from the variations of surface to volume ratio of nanomorphology. Accordingly, colossal dielectric constant value has been observed in CdO nanosphere having larger surface to volume ratio. The order of dielectric constant (dc) values observed for the present nanomorphologies is: dc of sphere > dc of flakes > dc of parallelepiped resembles the order of surface to volume ratios of the present morphologies respectively. The experimental data of complex impedance values are numerically fitted using theoretical models which provide the information of role of grain resistance on dielectric polarization and Cole-Cole type mechanism of dielectric relaxation process. The activation energies for electron transport are found to be 0.087 eV for spheres, 0.074 eV for flakes and 0.067 for parallelepiped nanomorphotypes of CdO. The dielectric and impedance spectroscopic analysis of the present material opens up wide scope for morphology-dependent tuning of nanomaterials for electrical applications.

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Two photon absorption induced optical limiting action of oxalate salt of pyridine for laser-assisted optoelectronic techniques

Willington

Joema²,

Sindhusha³

et al. 2021

J Mater Sci: Mater Electron

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Morphology dependent nanosecond and ultrafast optical power limiting of CdO nanomorphotypes

Abstract: Morphology dependent nonlinear optical power limiting of CdO nanomorphotypes.

Cited by 36 publications

References 36 publications

Femtosecond nonlinear absorption and optical limiting action in nanoplatelet CuFe2O4-decorated rGO nanocomposites

Femtosecond nonlinear absorption and optical limiting action in nanoplatelet CuFe2O4-decorated rGO nanocomposites

Morphology-dependent space charge polarization and dielectric relaxation of CdO nanomorphotypes

Two photon absorption induced optical limiting action of oxalate salt of pyridine for laser-assisted optoelectronic techniques

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