Noble metal nanoparticle surface plasmon resonance in absorbing medium

Aghlara, H.; Rostami, Rasoul; Maghoul, Amir; Salmanogli, Ahmad

doi:10.1016/j.ijleo.2013.12.089

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…42−45 However, the LSPR band overlaps with the π−π* band transition of PT. 46,47 Simultaneously, we observe the bands of the polaronic (750 nm) and bipolaronic states (1400 nm) due to the partial oxidation of the PT by Ag(I), which leads to an increase in the doping level. 48,49 These three bands increase progressively with the reaction time as the 3T polymerization occurs, reaching a maximum absorbance after 60 s. The maximum electrical conductivity is also achieved after 60 s. Once this reaction time is exceeded, the polaronic and bipolaronic bands decrease, confirming the PT's overoxidation.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

“…As the polymerization takes place, Ag NPs are simultaneously synthesized. Ag NPs show a characteristic localized surface plasmon resonance (LSPR) band in the visible between 400 and 800 nm, depending on the size, shape, and aggregation of Ag NPs. − However, the LSPR band overlaps with the π–π* band transition of PT. , Simultaneously, we observe the bands of the polaronic (750 nm) and bipolaronic states (1400 nm) due to the partial oxidation of the PT by Ag(I), which leads to an increase in the doping level. , These three bands increase progressively with the reaction time as the 3T polymerization occurs, reaching a maximum absorbance after 60 s. The maximum electrical conductivity is also achieved after 60 s. Once this reaction time is exceeded, the polaronic and bipolaronic bands decrease, confirming the PT’s overoxidation. Both the polaron and bipolaron bands dramatically decrease, leading to a substantial drop in conductivity.…”

Section: Results and Discussionmentioning

confidence: 88%

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In Situ Synthesis of Polythiophene and Silver Nanoparticles within a PMMA Matrix: A Nanocomposite Approach to Thermoelectrics

Serrano-Claumarchirant

Silva

Sánchez-Royo

et al. 2022

ACS Appl. Energy Mater.

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The processability of organic thermoelectric materials plays a crucial role due to their clear advantages of applicability in large-scale areas compared to traditional inorganic counterparts. A promising way to process thermoelectric materials based on conductive polymers is through in situ polymerization in an insulating polymer matrix. This work shows an interpenetrating polymeric network based on polythiophene, silver nanoparticles (Ag NPs), and poly(methyl methacrylate) (PMMA) produced by the oxidative polymerization of terthiophene by an oxidizing silver salt in a PMMA matrix. Ag NPs are in situ synthesized simultaneously as a byproduct. The reaction occurs very fast in the solid state, and after only 1 min, a homogeneous interpenetrating polymer network (IPN) film is obtained, reaching electrical conductivity values of 120 S cm −1 . Ag NPs play a determining role in the conducting properties of the IPN. Moreover, the thermoelectric properties were evaluated as a function of the synthesis parameters, reaching a maximum power factor of 51 μW m −1 K −2 . This study shows a promising method to enhance the processability of hybrid thermoelectric materials on the basis of conductive polymers and nanofillers.

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Section: ■ Results and Discussionmentioning

confidence: 79%

Section: Results and Discussionmentioning

confidence: 88%

In Situ Synthesis of Polythiophene and Silver Nanoparticles within a PMMA Matrix: A Nanocomposite Approach to Thermoelectrics

Serrano-Claumarchirant

Silva

Sánchez-Royo

et al. 2022

ACS Appl. Energy Mater.

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“…For spherical particles, there are simplified numerical models that assume various oscillations of the electronic cloud known as discrete dipole approximation (DDA), such as dipole and quadrupole oscillations [4]. The analytical calculation of LSPR is feasible for spherical particles [3,22], whereas complex particle shapes require complex numerical solutions [4,23].…”

Section: Introductionmentioning

confidence: 99%

Optical Characteristics of Directly Deposited Gold Nanoparticle Films

Parramon,

Švarc,

Majerič

et al. 2024

Surfaces

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The manuscript presents the optical properties of directly deposited films of gold nanoparticles (AuNPs) prepared by the Ultrasonic Spray Pyrolysis (USP) technology. Four samples were produced, with AuNP deposition times on the glass substrate of 15 min, 30 min, 1 h and 4 h. The morphological characterisation of the deposited films showed that the size of the first deposited AuNPs was between 10 and 30 nm, while, with a longer duration of the deposition process, larger clusters of AuNPs grew by coalescence and aggregation. The prepared layers were characterised optically with Ultraviolet–visible spectroscopy (UV–vis) and ellipsometry. The ellipsometric measurements showed an increasingly denser and thicker effective thickness of the AuNP layers. The extinction spectra displayed a clear local surface plasmonic resonance (LSPR) signature (peak 520–540 nm), indicating the presence of isolated particles in all the samples. For all AuNP layers, the imaginary part of the parallel and perpendicular components of the anisotropic dielectric function was dominated by a central peak at around 2.2 eV, corresponding to the LSPR of isolated particles, and a high-energy shoulder due to Au interband transitions. It was shown that, as the density of particles increased, the extinction cross-section grew over the whole spectral range where measurements are taken. Thus, the response can be explained with an enhanced electromagnetic response between the AuNPs that can be connected to the increase in particle density, but also by the formation of clusters and irregular structures.

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“…For spherical particles there are simplified numerical models that assume various oscillations of the electronic cloud known as discrete dipole approximation (DDA), such as dipole and quadrupole oscillations [4]. The analytical calculation of LSPR is feasible for spherical particles [3,15], whereas complex particle shapes require complex numerical solutions [4,16].…”

Section: Introductionmentioning

confidence: 99%

Optical Characteristics of Directly Deposited Gold Nanoparticle Films

Sancho Parramon,

Švarc,

Majerič

et al. 2024

Preprint

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The manuscript presents the optical properties of directly deposited films of gold nanoparticles (AuNPs) prepared by ultrasonic spray pyrolysis technology. Four samples were produced, with an AuNPs deposition time of 15 min, 30 min, 1h and 4h on the glass substrate. The morphological characterization of the deposited films showed that the size of the first deposited AuNPs is between 10 and 20 nm, while with a longer duration of the deposition process, larger clusters of AuNPs grow by coalescence and aggregation. The prepared layers were optically characterised with Ultraviolet–visible spectroscopy (UV-vis) and ellipsometry. The ellipsometric measurements showed an increasingly denser and thicker effective thickness of the AuNPs layers. The extinction spectra display a clear local surface plasmonic resonance (LSPR) signature (peak 520-540 nm), indicating the presence of isolated particles in all samples. For all AuNPs layers, the imaginary part of both ε// and ε⏊ is dominated by a central peak around 2.2 eV corresponding to the LSPR of isolated particles and a high-energy shoulder due to Au interband transitions. It is shown that, as the density of particles increases, the extinction cross section grows over the whole spectral range where measurements are taken. Thus response can be explained with an enhanced electromagnetic response among AuNPs, that can be connected to the increase of particle density but also by the formation of clusters and irregular structures.

show abstract

Noble metal nanoparticle surface plasmon resonance in absorbing medium

Cited by 11 publications

References 18 publications

In Situ Synthesis of Polythiophene and Silver Nanoparticles within a PMMA Matrix: A Nanocomposite Approach to Thermoelectrics

In Situ Synthesis of Polythiophene and Silver Nanoparticles within a PMMA Matrix: A Nanocomposite Approach to Thermoelectrics

Optical Characteristics of Directly Deposited Gold Nanoparticle Films

Optical Characteristics of Directly Deposited Gold Nanoparticle Films

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