Special Issue "Functional Plasmonic Nanostructures"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanophotonics Materials and Devices".

Deadline for manuscript submissions: 25 May 2022.

Special Issue Editor

Prof. Dr. Ir. Sammy W. Verbruggen
E-Mail Website
Guest Editor
University of Antwerp, Sustainable Energy
Interests: Plasmonics, Photocatalysis, Photoelectrochemical cells, Air Purification, Core-Shell Nanoparticles, Self-Cleaning Coatings, Photoreactor Design, Hydrogen

Special Issue Information

Dear Colleagues,

Plasmonic nanostructures have found their way into various fields of science, ranging from photocatalysis and photovoltaics, over (bio)sensing and spectroscopy, to medical applications. Every day researchers around the globe develop new plasmonic materials with improved functionalities for any of these application fields. This special issue aims to provide a perspective on exciting new developments of functional plasmonic nanostructures. We invite original research contributions or consice topical reviews both on the level of synthesis and characterization, as well as the various applications of new plasmonic nanomaterials. Theoretical studies highlighting the potential of dedicated plasmonic configurations are also welcomed. We are looking forward to learn about your most recent discoveries soon!

Prof. Dr. Ir. Sammy W. Verbruggen
Guest Editor

Manuscript Submission Information

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Keywords

  • Synthesis and Characterization of Plasmonic Nanostructures
  • Core-Shell nanoparticles
  • Mono-, bi- and tri-metallic nanoparticles
  • Surface Functionalization
  • 2D and 3D nano-assemblies
  • Numerical Simulations
  • Photocatalysis
  • Light Harvesting
  • (Bio)Sensing
  • Surface Enhanced Raman Spectroscopy
  • Photothermal effects & Photodynamic Therapy

Published Papers (4 papers)

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Research

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Article
Layer-by-Layer-Stabilized Plasmonic Gold-Silver Nanoparticles on TiO2: Towards Stable Solar Active Photocatalysts
Nanomaterials 2021, 11(10), 2624; https://doi.org/10.3390/nano11102624 - 06 Oct 2021
Viewed by 441
Abstract
To broaden the activity window of TiO2, a broadband plasmonic photocatalyst has been designed and optimized. This plasmonic ‘rainbow’ photocatalyst consists of TiO2 modified with gold–silver composite nanoparticles of various sizes and compositions, thus inducing a broadband interaction with polychromatic [...] Read more.
To broaden the activity window of TiO2, a broadband plasmonic photocatalyst has been designed and optimized. This plasmonic ‘rainbow’ photocatalyst consists of TiO2 modified with gold–silver composite nanoparticles of various sizes and compositions, thus inducing a broadband interaction with polychromatic solar light. However, these nanoparticles are inherently unstable, especially due to the use of silver. Hence, in this study the application of the layer-by-layer technique is introduced to create a protective polymer shell around the metal cores with a very high degree of control. Various TiO2 species (pure anatase, PC500, and P25) were loaded with different plasmonic metal loadings (0–2 wt %) in order to identify the most solar active composite materials. The prepared plasmonic photocatalysts were tested towards stearic acid degradation under simulated sunlight. From all materials tested, P25 + 2 wt % of plasmonic ‘rainbow’ nanoparticles proved to be the most promising (56% more efficient compared to pristine P25) and was also identified as the most cost-effective. Further, 2 wt % of layer-by-layer-stabilized ‘rainbow’ nanoparticles were loaded on P25. These layer-by-layer-stabilized metals showed superior stability under a heated oxidative atmosphere, as well as in a salt solution. Finally, the activity of the composite was almost completely retained after 1 month of aging, while the nonstabilized equivalent lost 34% of its initial activity. This work shows for the first time the synergetic application of a plasmonic ‘rainbow’ concept and the layer-by-layer stabilization technique, resulting in a promising solar active, and long-term stable photocatalyst. Full article
(This article belongs to the Special Issue Functional Plasmonic Nanostructures)
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Article
[email protected] Dendritic Nanoforests for Surface-Enhanced Raman Scattering Sensing
Nanomaterials 2021, 11(7), 1736; https://doi.org/10.3390/nano11071736 - 30 Jun 2021
Viewed by 710
Abstract
The effects of Au cores in Ag shells in enhancing surface-enhanced Raman scattering (SERS) were evaluated with samples of various Au/Ag ratios. High-density Ag shell/Au core dendritic nanoforests ([email protected]) on silicon ([email protected]/Si) were synthesized using the fluoride-assisted Galvanic replacement reaction method. The synthesized [...] Read more.
The effects of Au cores in Ag shells in enhancing surface-enhanced Raman scattering (SERS) were evaluated with samples of various Au/Ag ratios. High-density Ag shell/Au core dendritic nanoforests ([email protected]) on silicon ([email protected]/Si) were synthesized using the fluoride-assisted Galvanic replacement reaction method. The synthesized [email protected]/Si samples were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, reflection spectroscopy, X-ray diffraction, and Raman spectroscopy. The ultraviolet-visible extinction spectrum exhibited increased extinction induced by the addition of Ag when creating the metal DNFs layer. The pure Ag DNFs exhibited high optical extinction of visible light, but low SERS response compared with [email protected] DNFs. The Au core (with high refractive index real part) in [email protected] DNFs maintained a long-leaf structure that focused the illumination light, resulting in the apparent SERS enhancement of the Ag coverage. Full article
(This article belongs to the Special Issue Functional Plasmonic Nanostructures)
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Article
Theoretical Study on Symmetry-Broken Plasmonic Optical Tweezers for Heterogeneous Noble-Metal-Based Nano-Bowtie Antennas
Nanomaterials 2021, 11(3), 759; https://doi.org/10.3390/nano11030759 - 17 Mar 2021
Viewed by 517
Abstract
Plasmonic optical tweezers with a symmetry-tunable potential well were investigated based on a heterogeneous model of nano-bowtie antennas made of different noble substances. The typical noble metals Au and Ag are considered as plasmonic supporters for excitation of hybrid plasmonic modes in bowtie [...] Read more.
Plasmonic optical tweezers with a symmetry-tunable potential well were investigated based on a heterogeneous model of nano-bowtie antennas made of different noble substances. The typical noble metals Au and Ag are considered as plasmonic supporters for excitation of hybrid plasmonic modes in bowtie dimers. It is proposed that the plasmonic optical trapping force around a quantum dot exhibits symmetry-broken characteristics and becomes increasingly asymmetrical with increasing applied laser electric field. Here, it is explained by the dominant plasmon hybridization of the heterogeneous Au–Ag dimer, in which the plasmon excitations can be inconsistently modified by tuning the applied laser electric field. In the spectrum regime, the wavelength-dependent plasmonic trapping potential exhibits a two-peak structure for the heterogeneous Au–Ag bowtie dimer compared to a single-peak trapping potential of the Au–Au bowtie dimer. In addition, we comprehensively investigated the influence of structural parameter variables on the plasmonic potential well generated from the heterogeneous noble nano-bowtie antenna with respect to the bowtie edge length, edge/tip rounding, bowtie gap, and nanosphere size. This work could be helpful in improving our understanding of wavelength and laser field tunable asymmetric nano-tweezers for flexible and non-uniform nano-trapping applications of particle-sorting, plasmon coloring, SERS imaging, and quantum dot lighting. Full article
(This article belongs to the Special Issue Functional Plasmonic Nanostructures)
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Review

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Review
Surface-Enhanced Raman Sensing of Semi-Volatile Organic Compounds by Plasmonic Nanostructures
Nanomaterials 2021, 11(10), 2619; https://doi.org/10.3390/nano11102619 - 05 Oct 2021
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Abstract
Facile detection of indoor semi-volatile organic compounds (SVOCs) is a critical issue to raise an increasing concern to current researchers, since their emissions have impacted the health of humans, who spend much of their time indoors after the recent incessant COVID-19 pandemic outbreaks. [...] Read more.
Facile detection of indoor semi-volatile organic compounds (SVOCs) is a critical issue to raise an increasing concern to current researchers, since their emissions have impacted the health of humans, who spend much of their time indoors after the recent incessant COVID-19 pandemic outbreaks. Plasmonic nanomaterial platforms can utilize an electromagnetic field to induce significant Raman signal enhancements of vibrational spectra of pollutant molecules from localized hotspots. Surface-enhanced Raman scattering (SERS) sensing based on functional plasmonic nanostructures has currently emerged as a powerful analytical technique, which is widely adopted for the ultra-sensitive detection of SVOC molecules, including phthalates and polycyclic aromatic hydrocarbons (PAHs) from household chemicals in indoor environments. This concise topical review gives updated recent developments and trends in optical sensors of surface plasmon resonance (SPR) and SERS for effective sensing of SVOCs by functionalization of noble metal nanostructures. Specific features of plasmonic nanomaterials utilized in sensors are evaluated comparatively, including their various sizes and shapes. Novel aptasensors-assisted SERS technology and its potential application are also introduced for selective sensing. The current challenges and perspectives on SERS-based optical sensors using plasmonic nanomaterial platforms and aptasensors are discussed for applying indoor SVOC detection. Full article
(This article belongs to the Special Issue Functional Plasmonic Nanostructures)
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