Extinction coefficients of gold nanoparticles and their dimers. Dependence of optical factor on particle size

Dolinnyi, A. I.

doi:10.1134/s1061933x17050052

Cited by 12 publications

(4 citation statements)

References 32 publications

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“…The maximum peak wavelength of the Au-NPs is red-shifted from 521 to 538 nm with increasing CTAB concentration (figure S1(b)), indicating the formation of Au-NP of larger sizes with increasing CTAB concentration. Based on the reported value of the extinction coefficient of gold nanoparticles (Dolinnyi 2017), the concentrations of the Au-NPs in the dispersions were estimated to be 10 and 0.16 nM, respectively, for the smallest (10 nm) and largest (50 nm) particle sizes used in this study. Dispersions of AuNPs of different concentrations were prepared by diluting and concentrating the AuNP stock solution as required.…”

Section: Preparation Of Au Nps Of Different Sizesmentioning

confidence: 99%

Combined effects of nanoparticle size, and nanoparticle and surfactant concentrations on the evaporative kinetics, dried morphologies, and plasmonic property of gold colloidal dispersion droplets

Zaibudeen¹,

Bandyopadhyay²

2023

Nanotechnology

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Understanding the combined influence of various parameters on the formation and morphologies of distinct solute deposit patterns obtained after droplet drying is essential for developing numerous real-time applications. In this work, gold nanoparticle (Au-NP) dispersion droplets are dried on a hydrophilic substrate and the coupled effects of nanoparticle size, and nanoparticle and surfactant (CTAB) concentrations on the evaporative kinetics and evaporation-induced nanoparticle assemblies in dried deposit patterns are studied using optical and scanning electron microscopy. The distinct stages of drying of a CTAB stabilized Au-NP dispersion droplet, such as the evolutions of pinning, depinning, and a depletion region, change drastically for a combined increase of CTAB concentration and nanoparticle size for different nanoparticle concentrations. Accordingly, the dried pattern is composed of distinct regions of closely bound ordered Au-NP assemblies coexisting with loosely bound disordered packings of Au-NPs that form inside and outside the coffee stain pattern. The multilayers of densely packed and hexagonally arranged Au-NPs at the outer coffee stain edge are tested for SERS activity against a standard probe molecule (Rhodamine B – RhB). The least detection limit of RhB at the outer coffee stain edge improves by three orders of magnitude with increasing nanoparticle concentrations and nanoparticle sizes. The present study demonstrates that the drying kinetics, distinct dried deposit morphologies, and the limit of plasmonic activity of the deposited Au-NPs can be fine-tuned via a combined variation of CTAB concentration, nanoparticle size, and nanoparticle concentration in the Au-NP dispersion droplet. 

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Section: Preparation Of Au Nps Of Different Sizesmentioning

confidence: 99%

Combined effects of nanoparticle size, and nanoparticle and surfactant concentrations on the evaporative kinetics, dried morphologies, and plasmonic property of gold colloidal dispersion droplets

Zaibudeen¹,

Bandyopadhyay²

2023

Nanotechnology

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“…UV-vis spectroscopy was used to determine the surface plasmon resonance (SPR) properties of the MNPs and to quantify the yield of the reduction of gold using the extinction coefficient of AuNPs. 43,44 The spectra were recorded using a PerkinElmer Lambda 19 UV-vis spectrophotometer. The AuNPs/CNF suspension was placed in a quartz cuvette of 1 cm path length and the spectra were recorded against a blank of CNF suspension.…”

Section: Characterizationmentioning

confidence: 99%

Hybrids based on borate-functionalized cellulose nanofibers and noble-metal nanoparticles as sustainable catalysts for environmental applications

et al. 2020

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“…TEM images confirm the presence of AgNPs (dark spheres) and size analysis (N=76) results in an average diameter 17±10 nm, in agreement with the extinction spectra. Dispersion can be also quantified by counting the cases where the nearest neighbor spacing between particles exceeds two times their radius, the minimum distance below which undesirable particle-particle interactions significantly impact efficiency [60,61]. 88% of 144 measured nearest neighbor distances exceeded this measure.…”

Section: Nanocomposite Film Characterizationmentioning

confidence: 99%

Photothermally-driven thermo-oxidative degradation of low density polyethylene: heterogeneous heating plus a complex reaction leads to homogeneous chemistry

et al. 2019

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Photothermal heating from embedded nanoparticles, a process whereby visible light is converted into heat resulting in a high temperature in each particle’s immediate vicinity, was utilized to degrade low density polyethylene (LDPE) via thermo-oxidation. The spatially-varying steady-state photothermal temperature field is a potential mechanism by which ambient light (e.g. sunlight) could be used to drive chemical reactions within solid materials and may result in a non-uniform pattern of products, an advantage or disadvantage depending on application. Novel approaches to control polymer degradation are of interest because of the goal of remediating plastic waste, including autonomous means to minimize its effect when unconfined in the environment. For thermoplastic auto-oxidation, heterogeneous degradation would likely enhance deleterious micro-fragmentation however, the multi-step, multi-site nature of the reaction mitigated the temperature non-uniformity. A photothermally-heated LDPE nanocomposite with silver nanoparticle and cobalt-stearate additives showed degradation, characterized by ultraviolet–visible and Fourier-transform infrared absorption spectroscopy, electron microscopy, and mechanical testing, nearly identical to that resulting from uniform conventional treatment at the same average temperature.

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Extinction coefficients of gold nanoparticles and their dimers. Dependence of optical factor on particle size

Cited by 12 publications

References 32 publications

Combined effects of nanoparticle size, and nanoparticle and surfactant concentrations on the evaporative kinetics, dried morphologies, and plasmonic property of gold colloidal dispersion droplets

Combined effects of nanoparticle size, and nanoparticle and surfactant concentrations on the evaporative kinetics, dried morphologies, and plasmonic property of gold colloidal dispersion droplets

Hybrids based on borate-functionalized cellulose nanofibers and noble-metal nanoparticles as sustainable catalysts for environmental applications

Photothermally-driven thermo-oxidative degradation of low density polyethylene: heterogeneous heating plus a complex reaction leads to homogeneous chemistry

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