Active Plasmonics with Responsive, Binary Assemblies of Gold Nanorods and Nanospheres

Szustakiewicz, Piotr; Kowalska, Natalia; Bagiński, Maciej; Lewandowski, Wiktor

doi:10.3390/nano11092296

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…These observations confirm our hypothesis that LSPR and PCD shift and broadening may be caused by partial plasmon coupling. 67,68 Overall, the performed analyses of D-AuNR@HT2 in M1 composite attested that D-AuNR@HT2 NPs meet the requirement of chemical compatibility and hightemperature stability, needed for composite film preparation. Therefore, we conclude that embedding chiral, hydrophobic NPs within an organic matrix is a convenient way to increase their stability in the thin-film state (Figure S11).…”

Section: Synthesis and Phase Transfer Of Intrinsically Chiralmentioning

confidence: 90%

Hydrophobic Gold Nanoparticles with Intrinsic Chirality for the Efficient Fabrication of Chiral Plasmonic Nanocomposites

Kowalska

Bandalewicz

Kowalski

et al. 2022

ACS Appl. Mater. Interfaces

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The development of plasmonic nanomaterials with chiral geometry has drawn extensive attention owing to their practical implications in chiral catalysis, chiral metamaterials, or enantioselective biosensing and medicine. However, due to the lack of effective synthesis methods of hydrophobic nanoparticles (NPs) showing intrinsic, plasmonic chirality, their applications are currently limited to aqueous systems. In this work, we resolve the problem of achieving hydrophobic Au NPs with intrinsic chirality by efficient phase transfer of water-soluble NPs using low molecular weight, liquid crystal-like ligands. We confirmed that, after the phase transfer, Au NPs preserve strong, far-field circular dichroism (CD) signals, attesting their chiral geometry. The universality of the method is exemplified by using different types of NPs and ligands. We further highlight the potential of the proposed approach to realize chiral plasmonic, inorganic/organic nanocomposites with block copolymers, liquid crystals, and compounds forming physical gels. All soft matter composites sustain plasmonic CD signals with electron microscopies confirming well-dispersed nanoinclusions. The developed methodology allows us to expand the portfolio of plasmonic NPs with intrinsic structural chirality, thereby broadening the scope of their applications toward softmatter based systems.

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Section: Synthesis and Phase Transfer Of Intrinsically Chiralmentioning

confidence: 90%

Hydrophobic Gold Nanoparticles with Intrinsic Chirality for the Efficient Fabrication of Chiral Plasmonic Nanocomposites

Kowalska

Bandalewicz

Kowalski

et al. 2022

ACS Appl. Mater. Interfaces

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“…To overcome this limitation, several approaches have been proposed using shorter ligands such as hexa(ethylene glycol) [24][25][26]32] or liquid crystals matrix. [33] Secondly, controlling the temperature range of thermal response (upper and lower temperature limits at which clustering or redispersion commence) is critical for a variety of applications, including colorimetric sensing and soft-matter actuators. [34] Although the degree of polymerization of pNIPAM allows for temperature tuneability, [35] the bare polymer suffers from a relatively narrow temperature range (5-10 °C) dictating the thermal response of a system near the transition temperature.…”

Section: Introductionmentioning

confidence: 99%

“…However, these ligands impose rather large interparticle gaps at clustered state that can compromise plasmon coupling or enhancement of electric near fields. To overcome this limitation, several approaches have been proposed using shorter ligands such as hexa(ethylene glycol) [24–26,32] or liquid crystals matrix [33] . Secondly, controlling the temperature range of thermal response (upper and lower temperature limits at which clustering or redispersion commence) is critical for a variety of applications, including colorimetric sensing and soft‐matter actuators [34] .…”

Section: Introductionmentioning

confidence: 99%

Temperature‐Modulated Reversible Clustering of Gold Nanorods Driven by Small Surface Ligands

Kruse,

Rao,

Sánchez‐Iglesias

et al. 2023

Chemistry A European J

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Temperature‐modulated colloidal phase of plasmonic nanoparticles is a convenient playground for resettable soft‐actuators or colorimetric sensors. To render reversible clustering under temperature change, bulky ligands are required, especially if anisotropic morphologies are of interest. This study showcases thermoresponsive gold nanorods by employing small surface ligands, bis (p‐sulfonatophenyl) phenyl‐phosphine dihydrate dipotassium salt (BSPP) and native cationic surfactant. Temperature‐dependent analysis in real‐time allowed to describe the structural features (interparticle distance and cluster size) as well as thermal parameters, melting and freezing temperatures. These findings suggest that neither covalent Au−S bonds nor bulky ligands are required to obtain a robust thermoresponsive system based on anisotropic gold nanoparticles, paving the way to stimuli‐responsive nanoparticles with a wide range of sizes and geometries.

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“…It is one of the practical strategies for making ensembles of nanostructures with exceptional properties and functionalities [11]. When functionalized with stimulus-responsive ligands, AuNPs alter their physical and/or chemical properties at their surfaces upon encountering external stimuli, such as solution pH [12,13], temperature [14][15][16], and light [17,18], and form assembled structures. The ability to reversibly control nanoparticle assemblies with external stimuli accelerates tunable plasmon coupling for innovative applications [19].…”

Section: Introductionmentioning

confidence: 99%

Hysteresis in the Thermo-Responsive Assembly of Hexa(ethylene glycol) Derivative-Modified Gold Nanodiscs as an Effect of Shape

et al. 2022

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Anisotropic gold nanodiscs (AuNDs) possess unique properties, such as large flat surfaces and dipolar plasmon modes, which are ideal constituents for the fabrication of plasmonic assemblies for novel and emergent functions. In this report, we present the thermo-responsive assembly and thermo-dynamic behavior of AuNDs functionalized with methyl-hexa(ethylene glycol) undecane-thiol as a thermo-responsive ligand. Upon heating, the temperature stimulus caused a blue shift of the plasmon peak to form a face-to-face assembly of AuNDs due to the strong hydrophobic and van der Waals interactions between their large flat surfaces. Importantly, AuNDs allowed for the incorporation of the carboxylic acid-terminated ligand while maintaining their thermo-responsive assembly ability. With regard to their reversible assembly/disassembly behavior in the thermal cycling process, significant rate-independent hysteresis, which is related to their thermo-dynamics, was observed and was shown to be dependent on the carboxylic acid content of the surface ligands. As AuNDs have not only unique plasmonic properties but also high potential for attachment due to the fact of their flat surfaces, this study paves the way for the exploitation of AuNDs in the development of novel functional materials with a wide range of applications.

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Active Plasmonics with Responsive, Binary Assemblies of Gold Nanorods and Nanospheres

Cited by 3 publications

References 26 publications

Hydrophobic Gold Nanoparticles with Intrinsic Chirality for the Efficient Fabrication of Chiral Plasmonic Nanocomposites

Hydrophobic Gold Nanoparticles with Intrinsic Chirality for the Efficient Fabrication of Chiral Plasmonic Nanocomposites

Temperature‐Modulated Reversible Clustering of Gold Nanorods Driven by Small Surface Ligands

Hysteresis in the Thermo-Responsive Assembly of Hexa(ethylene glycol) Derivative-Modified Gold Nanodiscs as an Effect of Shape

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