Morphology dependent nonlinear optical and photocatalytic activity of anisotropic plasmonic silver

Thomas, Jeena; Thomas, Vinoy; John, Jancy; Mathew, S.; Thomas, Tony; Jose, Jasmine; Rejeena, I.; Mujeeb, A.

doi:10.1039/c8ra08893d

Cited by 15 publications

(9 citation statements)

References 51 publications

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“…Due to the refractive index gradient, the medium acts as a lens‐like optical element, called TL . When a probe beam passes through the spatially varying refractive index (lens), it gets diverged or focused depending upon the coefficient of refractive index with temperature,

\frac{dn}{dT} .

The negative value of

\frac{dn}{dT}

shows that the TL formed will be a diverging one resulting in thermal blooming. Measurement of time‐dependent beam intensity is more viable in a mode matched pump–probe collinear arrangement than to measure the spot size directly.…”

Section: Resultsmentioning

confidence: 99%

“…The focal length f of the induced TL, when a continuous‐wave laser beam is passed through a sample, at t = 0 is shown below

\frac{1}{bold-italicf} = \frac{P_{abs} \frac{dn}{dt}}{bold-italicπk ω^{2} ((), bold1 + \frac{{bold-italict}_{bold-italicc}}{bold2 bold-italict})}

Where P abs is the power absorbed by the sample, k is the thermal conductivity, ω is the beam radius, and t c is the characteristic time for thermal diffusion is given by

t_{c} = \frac{{bold-italicω}^{bold2}}{bold4 bold-italicD}

Where, D is the thermal diffusivity …”

Section: Resultsmentioning

confidence: 99%

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Eco‐friendly thermal insulation material from cellulose nanofibre

Jose

Thomas

Raj

et al. 2019

J of Applied Polymer Sci

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Nano cellulose is a material of current interest that has attracted considerable attention from researchers due to its interesting properties such as low toxicity, availability, natural abundance, biodegradability, and flexible surface chemistry. Cellulose fiber, usually derived from wood, plant walls or cotton is an eco-friendly thermal insulation material. The cellulose nanofibers (CNFs) described in this work were derived from cotton via sulfuric acid hydrolysis followed by ultrasonication. The formation of CNF and its morphology were analyzed using Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The thermooptic parameters of the prepared sample, which to the author's knowledge has not been reported so far, were studied by the dual beam mode-matched thermal lens technique. Thermal diffusivity (2.61 × 10 −8 m 2 /s) and thermal conductivity (0.108 W/mK) values of the prepared CNFs clearly point to the application potential of the material.

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\frac{dn}{dT} .

The negative value of

\frac{dn}{dT}

Section: Resultsmentioning

confidence: 99%

“…The focal length f of the induced TL, when a continuous‐wave laser beam is passed through a sample, at t = 0 is shown below

\frac{1}{bold-italicf} = \frac{P_{abs} \frac{dn}{dt}}{bold-italicπk ω^{2} ((), bold1 + \frac{{bold-italict}_{bold-italicc}}{bold2 bold-italict})}

Where P abs is the power absorbed by the sample, k is the thermal conductivity, ω is the beam radius, and t c is the characteristic time for thermal diffusion is given by

t_{c} = \frac{{bold-italicω}^{bold2}}{bold4 bold-italicD}

Where, D is the thermal diffusivity …”

Section: Resultsmentioning

confidence: 99%

Eco‐friendly thermal insulation material from cellulose nanofibre

Jose

Thomas

Raj

et al. 2019

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Another important aspect that determines the optical properties of plasmonic nanoparticles is the surface morphology, as the optical response is strongly influenced by the surface characteristics as well as shape. [49] González et al demonstrated moderately pronounced effect of the surface morphology on the optical spectra for small Ag nanoparticles from 4 to 13 nm in size. [50] The morphological irregularities in the larger particles synthesized by Bastús et al [8] is clear from their TEM images (Figure S2) and it is possible that they might be playing a significant role in shaping the optical spectra.…”

Section: The Deviation Of Theoretical Predictions From Experimental O...mentioning

confidence: 99%

Effect of size distribution, skewness and roughness on the optical properties of colloidal plasmonic nanoparticles

Borah

Verbruggen

2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Second and third harmonic generation measurements in amorphous ZnO thin films has been performed by rotational Maker fringe technique using Nd:YAG laser at 1064 nm in picosecond range for the verification of the nonlinear optical properties [51]. In addition, it has been found that the restricted motion of excitons and phonons can impact nonlinear functionalities of the nanomaterials depending on their shapes and sizes [52][53][54]. Indeed, many research articles have illustrated diverse methodologies to understand the morphology-dependent optical nonlinearities.…”

Section: Introductionmentioning

confidence: 99%

Hollow ZnO microspheres self-assembled from rod-like nanostructures: morphology-dependent linear and Kerr-type nonlinear optical properties

Haghighatzadeh

Mazinani

Ostad

et al. 2021

J Mater Sci: Mater Electron

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Hollow nanostructures have attracted attention because of their unique physiochemical properties and broad potential applications in electronics, optics and photonics. In this study, a facile hydrothermal approach was developed to fabricate hollow ZnO microspheres via self-assembled rod-like nanostructures. The morphology-controlled synthesis was conducted by altering hydrothermal treatment temperature (150, 200 and 250 °C) in solutions containing zinc acetate dihydrate precursor and glycerol as the stabilizing agent. The morphological observations indicated that hydrothermally grown ZnO architectures could be reasonably adjusted by modulating hydrothermal reaction temperature. Possible growth routes are proposed to elucidate the formation process of ZnO microspheres with the rod-like nanostructures. Morphology-dependent absorbance and emission along with red-shifts with improved crystalline qualities were observed with increasing hydrothermal growth temperature. Kerr-type nonlinear optical characteristics examined using single-beam Z-scan technique in the near infrared spectral range under nanosecond Nd-YVO4 laser pulses showed positive values of nonlinear refraction providing an evidence of self-focusing behaviors at the excitation wavelength of 1064 nm in all the samples studied. The highest Kerr-type nonlinear susceptibility was estimated to be 2.31 × 10–6 esu for hollow ZnO microspheres grown at 250 °C, suggesting synergistic effects of surface morphologies on optical nonlinearities.

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Morphology dependent nonlinear optical and photocatalytic activity of anisotropic plasmonic silver

Abstract: Anisotropic plasmonic silver for nonlinear optical and photo catalytic applications.

Cited by 15 publications

References 51 publications

Eco‐friendly thermal insulation material from cellulose nanofibre

Eco‐friendly thermal insulation material from cellulose nanofibre

Effect of size distribution, skewness and roughness on the optical properties of colloidal plasmonic nanoparticles

Hollow ZnO microspheres self-assembled from rod-like nanostructures: morphology-dependent linear and Kerr-type nonlinear optical properties

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