A Chemist’s View on Electronic and Steric Effects of Surface Ligands on Plasmonic Metal Nanostructures

Kim, Yoonhee; Ji, Sanghoon; Nam, Jwa‐Min

doi:10.1021/acs.accounts.3c00196

Cited by 10 publications

(2 citation statements)

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“…Moreover, chlorides typically function as surface ligands, which additionally activate the oxidation by donating electrons toward surface atoms. 34 The importance of chloride ions is evident from the fact that in their absence, the reaction does not occur at all, as illustrated in the bottom panel of Figure 4b. The complete removal of the chloride ions was achieved through ligand exchange with polysorbate 20, a poly(ethylene glycol)-based polymer known as Tween 20, which was conducted before the reaction in the absence of CTAC.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…The presence of chloride ions subtly detours redox reactions and modifies the reduction potentials, which enables the hitherto forbidden redox pairs of Ag 0 oxidation to Ag + and Cu 2+ reduction to Cu + . Moreover, chlorides typically function as surface ligands, which additionally activate the oxidation by donating electrons toward surface atoms . The importance of chloride ions is evident from the fact that in their absence, the reaction does not occur at all, as illustrated in the bottom panel of Figure b.…”

Section: Resultsmentioning

confidence: 99%

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Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Jung,

Kim,

Lee

et al. 2024

J. Am. Chem. Soc.

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Ag nanoparticles have garnered significant attention for their excellent plasmonic properties and potential use as plasmonic cavities, primarily because of their intrinsically low ohmic losses and optical properties in the visible range. These are particularly crucial in systems involving quantum dots that absorb light at low wavelengths, where the need for a high threshold energy of interband transitions necessitates the incorporation of Ag nanostructures. However, the synthesis of Ag nanoparticles still encounters challenges in achieving structural uniformity and monodispersity, along with chemical stability, consequentially inducing inconsistent and poorly reliable optical responses. Here, we present a two-step approach for synthesizing highly uniform spherical Ag nanoparticles involving depletion-induced flocculation and Cu(II)-mediated oxidative etching. We found that the selective flocculation of multitwinned Ag nanocrystals significantly enhances the uniformity of the resulting Ag nanostructures, leaving behind only single-crystalline and single-twinned nanostructures. Subsequent oxidative etching, in which cupric ions are directly involved in the reaction, was designed based on Pourbaix diagrams to proceed following thermodynamically favorable states and circumvent the generation of reactive chemical species such as H 2 O 2 . This leads to perfectly spherical shapes of final Ag nanoparticles with a synthetic yield of 99.5% and additionally reduces the overall reaction time. Furthermore, we explore the potential applications of these monodisperse Ag nanospheres as uniform plasmonic cavities. The fabricated Ag nanosphere films uniformly enhanced the photoluminescence of InP/ZnSe/ZnS quantum dots, showcasing their capabilities in exhibiting consistent plasmonic responses across a large area.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Jung,

Kim,

Lee

et al. 2024

J. Am. Chem. Soc.

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Tandem Electric‐Fields Prolong Energetic Hot Electrons Lifetime for Ultra‐Fast and Stable NO₂ Detection

Ou,

Wang,

et al. 2024

Advanced Materials

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Prolonging energetic hot electrons lifetimes and surface activity in the reactive site can overcome the slow kinetics and unfavorable thermodynamics of photo‐activated gas sensors. However, bulk and surface recombination limit simultaneous optimization of both kinetics and thermodynamic. Here we deploy tandem electric‐fields at (111)/(100)Au‐CeO2 to ensure a sufficient driving force for carriers transfer and elucidate the mechanism of the relationship between charges transport and gas‐sensing performance. The asymmetric structure of (111)/(100)CeO2 facet junction provide interior electric‐fields, which facilitates electron transfer from (100)face to (111)face. This separation of reduction and oxidation reaction sites across different crystal faces helps inhibit surface recombination. The increased electron concentration at the (111)face intensifies the interface electric field, which promotes electron transfer to Au site. The local electric‐field generated by the surface plasmon resonance effect promotes the generation of high energy hot‐electrons, which maintains charge concentration in interface field by injecting into (111)/(100)CeO2, thereby provide thermodynamic contributions and inhibit bulk recombination. The tandem electric fields enable the (111)/(100)Au‐CeO2 to rapidly detect 5 ppm of NO2 at room temperature with stability maintained within 20 s.This article is protected by copyright. All rights reserved

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Nanoreinforcement strategies for enhancing biodegradable composites in biochemical applications within agriwaste valorisation

Ziani,

El Guerraf,

Bentouhami

et al. 2024

Biocatalysis and Agricultural Biotechnology

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A Chemist’s View on Electronic and Steric Effects of Surface Ligands on Plasmonic Metal Nanostructures

Cited by 10 publications

References 83 publications

Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Tandem Electric‐Fields Prolong Energetic Hot Electrons Lifetime for Ultra‐Fast and Stable NO₂ Detection

Nanoreinforcement strategies for enhancing biodegradable composites in biochemical applications within agriwaste valorisation

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A Chemist’s View on Electronic and Steric Effects of Surface Ligands on Plasmonic Metal Nanostructures

Cited by 10 publications

References 83 publications

Selective Flocculation and H2O2-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Selective Flocculation and H2O2-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Tandem Electric‐Fields Prolong Energetic Hot Electrons Lifetime for Ultra‐Fast and Stable NO2 Detection

Nanoreinforcement strategies for enhancing biodegradable composites in biochemical applications within agriwaste valorisation

Contact Info

Product

Resources

About

Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Selective Flocculation and H₂O₂-Free Oxidative Etching-Based Synthesis of Highly Monodisperse Ag Nanospheres for Uniform Quantum Dot Photoluminescence-Enhancing Plasmonic Cavity Applications

Tandem Electric‐Fields Prolong Energetic Hot Electrons Lifetime for Ultra‐Fast and Stable NO₂ Detection