Anisotropic dual-plasmonic hetero-nanostructures with tunable plasmonic coupling effects

Abstract

The influence of plasmonic coupling effects between different components in Au NRs@Cu2-xSe nanostructures on their characteristics was studied. For this aim, anisotropic Au@Cu2-xSe hetero-nanostructures with well-controlled design and optical properties...

Smart Design of Noble Metal–Copper Chalcogenide Dual Plasmonic Heteronanoarchitectures for Emerging Applications: Progress and Prospects

“…The coupling strength between the counterparts of anisotropic dual plasmonic nanocomposites can be modulated by the wavelength gap between the longitudinal LSPRs of the Au NRs core and LSPR of the copper chalcogenide shell. 66 The effect of the band overlap in anisotropic structures was studied by synthesizing Au NRs cores with different aspect ratios to obtain Au NRs-1@Cu 2−x Se with partial band overlap and Au NRs-2@Cu 2−x Se with a full overlap of plasmonic peaks in the spectrum (Figure 5E,F). Through an elaborate synthesis of the Au NRs core and adjustment of the stoichiometry of the Cu 2−x Se shell by the time of oxidation on air and overall shell thickness, the LSPRs of both could be accurately tuned to the same wavelength, and only two LSPR peaks observed in spectra of Au NR-2@Cu 2−x Se colloid.…”

“…Corresponding volumes of 0.01 M SeO 2 used for synthesis are noted in the figure. Reproduced and adapted with permission from ref . Copyright 2022 Royal Society of Chemistry.…”

“…After the deposition of copper chalcogenide, in addition to the two resonance peaks of the Au NRs core, one more intense and broader band in the NIR region appeared. The coupling strength between the counterparts of anisotropic dual plasmonic nanocomposites can be modulated by the wavelength gap between the longitudinal LSPRs of the Au NRs core and LSPR of the copper chalcogenide shell . The effect of the band overlap in anisotropic structures was studied by synthesizing Au NRs cores with different aspect ratios to obtain Au NRs-1@Cu 2– x Se with partial band overlap and Au NRs-2@Cu 2– x Se with a full overlap of plasmonic peaks in the spectrum (Figure E,F).…”

Facile aqueous synthesis of hollow dual plasmonic hetero-nanostructures with tunable optical responses through nanoscale Kirkendall effects

“…Over the past decades, the research on dual plasmonic nanostructures has been burgeoning [3][4][5][6][7][8][9] and much progress has been made with respect to the synthesis of a wide variety of dual plasmonic nanostructures with distinctive material compositions, sizes, or shapes. [10][11][12][13][14][15][16][17][18][19] Among a plethora of dual plasmonic hetero-nanostructures obtained, the hollow nanocrystals comprising noble metal cores and nonstoichiometric copper chalcogenide shells are particularly intriguing owing to their unique properties such as large surface areas, high pore volumes, reduced charge recombination, low densities, and accelerated mass transfer dynamics. 20,21 As is known, hollow nanostructures are interesting functional nanomaterials for a variety of applications such as catalysis, 22,23 energy storage, 24 lithium-ion batteries, 25 drug delivery, 26,27 and biomedicine.…”

Roles of Heterojunction and Cu Vacancies in the Au@Cu2–xSe for the Enhancement of Electrochemical Nitrogen Reduction Performance

“…The creation of a heterojunction between plasmonic metals and semiconductors is a promising strategy for tuning optical responses and tailoring properties in photo- and electrochemical catalysis. Hybrid nanostructures consisting of a plasmonic Au metal core and a Cu 2– x Se semiconductor shell are known as dual-plasmonic hybrid nanomaterials. − At the interface between plasmonic metal and semiconductor within core@shell-structured Au@Cu 2– x Se nanoparticles, an Ohmic junction is formed between Au and Cu 2– x Se owing to the comparatively lower work function of the p-type semiconductor (Φ Cu 2– x Se = 4.8 eV) compared to that of metal Au (Φ Au ∼ 5.2–5.4 eV) (Φ s < Φ M ). , As a result, electrons are spontaneously transferred from Cu 2– x Se to Au through the heterointerface until the Fermi levels reach equilibrium, creating a strong interfacial electrical field in the heterostructure. This interfacial electric field induces electron depletion on the surface of Au@Cu 2– x Se nanoparticles. , This can be used to facilitate N 2 adsorption while preventing H + adsorption, thus enhancing the ENRR performance.…”