Spectral-Selective Plasmonic Polymer Nanocomposites Across the Visible and Near-Infrared

Khan, Assad U.; Guo, Yichen; Chen, Xi; Liu, Guoliang

doi:10.1021/acsnano.8b09386

Cited by 13 publications

(16 citation statements)

References 89 publications

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“…The red-shifted maxima and long absorption tails in the spectra of the HL2 layers prepared during the second reduction process indicate that Ag-NPs of mixed shapes with red-shifted SP absorption are present in the HL2 layers, such as nanocircular discs with SP absorption at 510-581 nm or hexagonal and truncated nanotriangles with SP at wavelengths >581 nm [43,44]. The SP absorption peak can shift to a higher wavelength with increased aggregation of nanoparticles [45][46][47][48]. This could also be the case here due to the higher Ag-NP concentration in the HL2 layers.…”

Section: Copolymermentioning

confidence: 99%

Hybrid Layers of Donor-Acceptor Copolymers with Homogenous Silver Nanoparticle Coverage for Photonic Applications

et al. 2021

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Hybrid layers of donor-acceptor (D-A) copolymers containing N,N′-dialkylperylene-3,4,9,10-tetracarboxydiimide electron-acceptor units covered with silver nanoparticles (Ag-NPs) were prepared by electrochemical doping of pristine layers during reduction processes. In situ optical absorption spectra of the layers were recorded during the formation of Ag-NP coverage. The hybrid layers were characterized by absorption spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy dispersive X-ray spectroscopy (EDX). In the absorption spectra of the hybrid layers, a surface plasmon band characteristic of Ag-NPs appeared. Significant improvements in light absorption due to the plasmonic effects of Ag NPs were observed. Stable Ag-NPs with an average diameter of 41–63 nm were formed on the surface, as proven by SEM and XPS. The Ag-NP coverage and size depended on the hybrid layer preparation conditions and on the copolymer composition. The metallic character of the Ag-NPs was proven by XPS. The location in the surface layer was further confirmed by EDX analysis. To the best of our knowledge, this is the first report on such hybrid layers having the potential for a variety of photonic and electronic applications.

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Section: Copolymermentioning

confidence: 99%

Hybrid Layers of Donor-Acceptor Copolymers with Homogenous Silver Nanoparticle Coverage for Photonic Applications

et al. 2021

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“…To analyze whether there were thermal effects associated with the light source or the polymerization reaction, we monitored the temperature of the sample during irradiation at the different light intensities analyzed. By using infrared thermometry, we determined that the temperature of the sample increased only 1 and 5 °C, under irradiation at 15 and 60 mW/cm 2 , respectively (see Figure S4 in Supporting Information). Based on these results, we can rule out thermal effects during the preparation of nanocomposites.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Light Intensity on the Aggregation Behavior of Primary Particles during In Situ Photochemical Synthesis of Gold/Polymer Nanocomposites

et al. 2020

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Metal/polymer nanocomposites have attracted much attention in recent years due to their exceptional properties and wide range of potential applications. A key challenge to obtain these materials is to stabilize the metal nanoparticles in the matrix, avoiding uncontrolled aggregation processes driven by the high surface free energy of nanosized particles. Here, we investigate the aggregation mechanism of primary particles in gold−epoxy nanocomposites prepared via light-assisted in situ synthesis, under different irradiation conditions. The growth and aggregation of gold nanoparticles were monitored in situ by time-resolved small-angle X-ray scattering experiments, whereas spectroscopic measurements were performed to interpret how matrix polymerization influences the aggregation process. It was found that light intensity has a greater influence on the reduction rate than on the polymerization rate. Under irradiation, gold nanostructures evolve through five time-defined stages: nucleimass fractalssurface fractalsspherical nanoparticlesaggregates. If the maximum in the polymerization rate is reached before the aggregation step, individual primary nanoparticles will be preserved in the polymer matrix due to diffusional constraints imposed by the reaction medium. Because the light intensity has a different influence on the reduction rate than on the polymerization rate, this parameter can be used as a versatile tool to avoid aggregation of gold nanoparticles into the polymer matrix.

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“…Nanoparticles (NPs) are often incorporated into a polymer matrix to enhance the intrinsic physical properties of neat polymers, which has been a general strategy to produce polymer nanocomposites (PNCs). − While adding NPs certainly alters the mechanical, electrical, and optical properties, the degree of enhancement/reduction in physical properties relies on the state of particle dispersion, resulting from a delicate interplay between particle and polymer interactions. − To ensure a good dispersion of inorganic NPs commonly used in polymer matrices, the intrinsic incompatibility between inorganic nanofiller and organic matrix polymer must be overcome at the interfaces, which can be usually resolved by a proper surface modification of NPs.…”

Section: Introductionmentioning

confidence: 99%

Control of Particle Dispersion with Autophobic Dewetting in Polymer Nanocomposites

Kwon¹,

Kim²,

Shin³

et al. 2020

Macromolecules

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Good particle dispersion in polymer nanocomposites (PNCs) is often hampered by autophobic dewetting where the matrix polymers are expelled from the grafted polymer, generally believed to result in increased particle aggregation and enhanced mechanical properties in dilute particle regime. However, we found that autophobic dewetting with highly extended short-chain polymers improves/disrupts particle dispersity, strongly dependent on particle volume fraction. Under strong autophobic condition given with the high-molecular-weight ratio between the matrix, P, and grafted polymer, N, (P/N ≫ 1), silica nanoparticles grafted with dopamine-modified poly(ethylene glycol) (DOPA-mPEG) brush polymer are dispersed in the PEG matrix by varying the surface grafting rate. In the dilute particle regime, we found that increasing grafting rate ironically improves particle dispersion and reduces the shear modulus as dewetted polymers cannot bridge the particles. In the concentrated particle regime, on the contrary, particles become more aggregated and the corresponding mechanical strength increases with grafting rate as a denser particle network is formed by depletion attractions. Investigating the microstructures, dynamics, and rheological properties of PNCs with small-angle X-ray scattering, time-domain proton NMR, and oscillatory rheometry experiments, respectively, this study provides additional design guidelines for controlling the detailed structure and properties of PNCs.

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Spectral-Selective Plasmonic Polymer Nanocomposites Across the Visible and Near-Infrared

Cited by 13 publications

References 89 publications

Hybrid Layers of Donor-Acceptor Copolymers with Homogenous Silver Nanoparticle Coverage for Photonic Applications

Hybrid Layers of Donor-Acceptor Copolymers with Homogenous Silver Nanoparticle Coverage for Photonic Applications

Effect of Light Intensity on the Aggregation Behavior of Primary Particles during In Situ Photochemical Synthesis of Gold/Polymer Nanocomposites

Control of Particle Dispersion with Autophobic Dewetting in Polymer Nanocomposites

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