Ag/Au alloy entangled in a protein matrix: A plasmonic substrate coupling surface plasmons and molecular chirality

Simone, Giuseppina; Abdalla, Saifeldin

doi:10.1016/j.apsusc.2020.146711

Cited by 9 publications

(9 citation statements)

References 90 publications

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“…Note that the system including the GO layer for immobilizing the AgAu@cages has been already studied by our group for measuring the circular dichroism of the proteinaceous matrix and the metallic alloy housed in its network. [ 20 ] In light of the results reported here, the result of the previous investigation finds motivation.…”

Section: Resultssupporting

confidence: 56%

“…The plasmon excitation can favor the jump of the conduction electrons into an empty orbital of the surrounding matter and create electron–hole pairs on the metal side, while the new electronic configuration boosts the sensing application, as we observed during the tracking of the enantiomer pair. [ 20 ]…”

Section: Resultsmentioning

confidence: 99%

“…In addition, part of this research took motif starting from the significant circular dichroism measured in this system. [20,21] To trap and retain the molecules for enhanced SERS, gelatin cages were used. [22,23] Nanometric particles of Ag/Au alloy have been grown and entangled in a proteinaceous network, which consists of the shell of spherical and spheroidal gelatin cages.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, part of this research took motif starting from the significant circular dichroism measured in this system. [ 20,21 ]…”

Section: Introductionmentioning

confidence: 99%

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Propagating Surface Plasmon Polaritons Excited at the Graphene Oxide/AgAu Alloy Interface Enhance Nonlinearity

Simone

2021

Physica Status Solidi (b)

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Graphene oxide (GO) contains intrinsic tunable plasmons, leading to highly attractive plasmonic phenomena, besides the GO coupling with metal nanostructures is promising for plasmonics. Herein, a system consisting of an AgAu alloy entangled in a protein network, AgAu@cages, coupled with a GO layer is designed and analyzed. To overcome the challenges posed by the synthesis of the hybrid GO/metal system, the AgAu alloy is grown inside a proteinaceous network. The approach allows control over the alloy size distribution and a close contact with the samples, with positive impact on the plasmonic analysis. The hybrid system reveals a strong dependence on the incident angle and a shorter linewidth as well as a redshift, motivating further investigations to elucidate the phenomenon. Combined experimental and numerical investigations lead to the displaying of the strong coupling that occurs between the plasmons and the molecular cavity of GO, and a coherent amplification of molecular motion. In conclusion, the versatility of GO‐based systems allows the manufacture of plasmonic and optical devices sensitive to a wide range of frequencies, from terahertz to the visible frequencies, with extremely low driving voltage.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In addition, part of this research took motif starting from the significant circular dichroism measured in this system. [ 20,21 ]…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Propagating Surface Plasmon Polaritons Excited at the Graphene Oxide/AgAu Alloy Interface Enhance Nonlinearity

Simone

2021

Physica Status Solidi (b)

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“…In addition to DNA, peptides and other materials can also drive chiral NP assembly. ,− Rosi and co-workers designed peptide templates to self-assemble achiral Au NPs into helical superstructures (Figure D). ,− They designed peptide frameworks with inherent chain-like chirality using polyproline II (PPII) helices and Au-binding peptide conjugate molecules. Achiral Au NPs were grown onto the peptides’ binding sites via in situ Au 3+ reduction.…”

Section: Structural Chirality and Self-assemblymentioning

confidence: 99%

Nanophotonic Approaches for Chirality Sensing

Warning¹,

Miandashti²,

McCarthy³

et al. 2021

ACS Nano

179

154

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Chiral nanophotonic materials are promising candidates for biosensing applications because they focus light into nanometer dimensions, increasing their sensitivity to the molecular signatures of their surroundings. Recent advances in nanomaterial-enhanced chirality sensing provide detection limits as low as attomolar concentrations (10–18 M) for biomolecules and are relevant to the pharmaceutical industry, forensic drug testing, and medical applications that require high sensitivity. Here, we review the development of chiral nanomaterials and their application for detecting biomolecules, supramolecular structures, and other environmental stimuli. We discuss superchiral near-field generation in both dielectric and plasmonic metamaterials that are composed of chiral or achiral nanostructure arrays. These materials are also applicable for enhancing chiroptical signals from biomolecules. We review the plasmon-coupled circular dichroism mechanism observed for plasmonic nanoparticles and discuss how hotspot-enhanced plasmon-coupled circular dichroism applies to biosensing. We then review single-particle spectroscopic methods for achieving the ultimate goal of single-molecule chirality sensing. Finally, we discuss future outlooks of nanophotonic chiral systems.

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Chiral Plasmonic Hybrid Nanostructures: A Gateway to Advanced Chiroptical Materials

Tan,

Fu,

Gao

et al. 2023

Advanced Materials

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Chirality introduces a new dimension of functionality to materials, unlocking new possibilities across various fields. When integrated with plasmonic hybrid nanostructures, this attribute synergizes with plasmonic and other functionalities, resulting in unprecedented chiroptical materials that push the boundaries of the system's capabilities. Recent advancements have illuminated the remarkable chiral light–matter interactions within chiral plasmonic hybrid nanomaterials, allowing for the harnessing of their tunable optical activity and hybrid components. These advancements have led to applications in areas such as chiral sensing, catalysis, and spin optics. Despite these promising developments, there remains a need for a comprehensive synthesis of the current state‐of‐the‐art knowledge, as well as a thorough understanding of the construction techniques and practical applications in this field. This review begins with an exploration of the origins of plasmonic chirality and an overview of the latest advancements in the synthesis of chiral plasmonic hybrid nanostructures. Furthermore, representative emerging categories of hybrid nanomaterials are classified and summarized, elucidating their versatile applications. Finally, the review engages with the fundamental challenges associated with chiral plasmonic hybrid nanostructures and offer insights into the future prospects of this advanced field.

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Ag/Au alloy entangled in a protein matrix: A plasmonic substrate coupling surface plasmons and molecular chirality

Cited by 9 publications

References 90 publications

Propagating Surface Plasmon Polaritons Excited at the Graphene Oxide/AgAu Alloy Interface Enhance Nonlinearity

Propagating Surface Plasmon Polaritons Excited at the Graphene Oxide/AgAu Alloy Interface Enhance Nonlinearity

Nanophotonic Approaches for Chirality Sensing

Chiral Plasmonic Hybrid Nanostructures: A Gateway to Advanced Chiroptical Materials

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