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

Borah, Rituraj; Verbruggen, Sammy W.

doi:10.1016/j.colsurfa.2022.128521

Cited by 18 publications

(11 citation statements)

References 52 publications

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“…While optical constants of Au reported in various literature have a general agreement, for Ag, there exist some variations, as discussed in detail in earlier work. The suitability of the optical constants of Palik in predicting plasmonic response of colloidal nanoparticles has been established by taking into consideration all the influencing factors such as particle polydispersity, skewness of size distribution, morphological irregularity, and so on 31 . It is known that for particles of size 10 nm and larger, the quantum effects are not strong 32 .…”

Section: Resultsmentioning

confidence: 99%

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Borah

Ninakanti

Bals

et al. 2022

Sci Rep

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While the behaviour of plasmonic solid thin films in the Kretschmann (also known as Attenuated Total Reflection, ATR) configuration is well-understood, the use of discrete nanoparticle arrays in this optical configuration is not thoroughly explored. It is important to do so, since close packed plasmonic nanoparticle arrays exhibit exceptionally strong light-matter interactions by plasmonic coupling. The present work elucidates the optical properties of plasmonic Au and Ag nanoparticle arrays in both the direct normal incidence and Kretschmann configuration by numerical models, that are validated experimentally. First, hexagonal close packed Au and Ag nanoparticle films/arrays are obtained by air–liquid interfacial assembly. The numerical models for the rigorous solution of the Maxwell’s equations are validated using experimental optical spectra of these films before systematically investigating various parameters. The individual far-field/near-field optical properties, as well as the plasmon relaxation mechanism of the nanoparticles, vary strongly as the packing density of the array increases. In the Kretschmann configuration, the evanescent fields arising from p- and s-polarized (or TM and TE polarized) incidence have different directional components. The local evanescent field intensity and direction depends on the polarization, angle of incidence and the wavelength of incidence. These factors in the Kretschmann configuration give rise to interesting far-field as well as near-field optical properties. Overall, it is shown that plasmonic nanoparticle arrays in the Kretschmann configuration facilitate strong broadband absorptance without transmission losses, and strong near-field enhancement. The results reported herein elucidate the optical properties of self-assembled nanoparticle films, pinpointing the ideal conditions under which the normal and the Kretschmann configuration can be exploited in multiple light-driven applications.

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Section: Resultsmentioning

confidence: 99%

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Borah

Ninakanti

Bals

et al. 2022

Sci Rep

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“…In colloids of such small nanoparticles, the LSPR position and the bandwidth remain almost unaffected by the polydispersity of the particle diameter. 44 Schatz and coworkers have shown that irregularities in the 2D lattice, such as small variations in the particle diameter and the interparticle gap, can be circumvented in the electromagnetic models by taking average values, in our case 10 and 2 nm, respectively. 45 Also, minor deviations from the perfect hexagonal closepacking can be ignored.…”

Section: ■ Results and Discussionmentioning

confidence: 81%

Self-Assembled Ligand-Capped Plasmonic Au Nanoparticle Films in the Kretschmann Configuration for Sensing of Volatile Organic Compounds

Borah

Smets

Ninakanti

et al. 2022

ACS Appl. Nano Mater.

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“…In metal nano/microparticle colloids, the polydispersity in sizes is an important driving factor for the broadening of the LSPR peak. Other factors exist that cause peak broadening such as the induction of multipolar resonances (for particle sizes exceeding the quasi‐static limit), hybridization of resonances (due to particle proximity, surface roughness, and substrate effects), overlapping with other electronic transitions such as inter‐band transitions (the reason why Ag NPs have a well‐separated and narrow SPR peak compared to Au and Cu) the relative ratio between radiative and non‐radiative damping etc [51] . The CuNPs of the CNTA sample, being significantly smaller in size (albeit not very small as to reach the mean free path [52] of Cu of 40 nm wherein surface damping effects start to dominate) exhibit reduced broadening of the LSPR peak due to reduced phase retardation (compared to larger particle where inhomogeneous polarization results in an increase in this phenomenon) and reduced multipole excitations, [53] as could be observed in the absorption spectra shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Oxidative and Colloidal Kinetics of Size‐Controlled Copper Structures through Surface Plasmon‐Regulated Examinations for Broadband Absorbance

Indhu,

Dharmalingam

2024

ChemistrySelect

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Out of all the candidate plasmonic metals, copper has noteworthy optical characteristics and is also economically favourable for use. However, the stability of plasmonic copper nanomaterials against the loss of the plasmonic property is a setback. The present work is on the synthesis of oxidation‐stable copper micro/nanoparticles (CuMps/NPs) at ambient conditions with chosen precursors, antioxidizing agents, polymeric capping agents and chelating ligands. The Surface Plasmon Resonance (SPR) response of the synthesized Cu structures and their morphological analyses are studied. XRD data revealed changes in crystal structure such as crystallite sizes, lattice distortions and dislocation densities as a result of variations in the synthesis conditions. We present from these analyses micro/nanostructures of oxidation‐stable plasmonic Cu. The validation of the aggregation and oxidation stabilities of the different synthesized samples make them a worthy choice for multiple plasmonic applications, along with showing the synthesis protocols as viable approaches for achieving such structures with a markedly increased shelf life.

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

Cited by 18 publications

References 52 publications

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration

Self-Assembled Ligand-Capped Plasmonic Au Nanoparticle Films in the Kretschmann Configuration for Sensing of Volatile Organic Compounds

Oxidative and Colloidal Kinetics of Size‐Controlled Copper Structures through Surface Plasmon‐Regulated Examinations for Broadband Absorbance

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