A versatile strategy for controlled assembly of plasmonic metal/semiconductor hemispherical nano-heterostructure arrays

Jia, Meng; Zhang, Yuying; Li, Zhengxin; Crouch, Emma; Doble, Samantha; Avenoso, Joseph; Han, Yan; Ni, Chaoying; Gundlach, Lars

doi:10.1039/d0nr03551c

Cited by 4 publications

(20 citation statements)

References 76 publications

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“…4−9 Au and Ag nanoparticles have been broadly investigated because their LSPR is located in the visible spectral range which makes them compatible with many optical technologies. 10 Furthermore, the fabrication of Au and Ag nanoparticles has been well established and widely published. Numerous investigations have explored the control of the LSPR by varying parameters such as size, shape, and dielectric environment.…”

Section: ■ Introductionmentioning

confidence: 99%

“…35,36 In addition, inhomogeneities of nanoparticles in suspension often complicate accurate characterization. 10 Full alloying of Ag@Au core/shell nanoparticles from solutionbased synthesis has been reported; however, the achievable ratio was limited to Ag-rich particles. 19 Direct fabrication of thermally alloyed Au/Ag nanoparticles on substrates, on the other hand, has proven to be difficult due to the low stability of Ag and evaporation during the alloying process.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Also, the concentration of copper(II) sulfate pentahydrate solution can be increased to synthesize thicker semishells. 10 Finally, the substrate was rinsed with DI water and dried under an inert gas.…”

Section: ■ Introductionmentioning

confidence: 99%

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Fabrication of Large-Area Fully Alloyed Ag/Au Nanoparticle Arrays

Babawale,

Gundlach

2023

ACS Appl. Nano Mater.

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The potential applications of nanoparticles in future technologies are extensive. Many of those applications require assembly of monodispersed nanostructures into ordered macroscopic building blocks, such as arrays, to enable their integration into complex devices. Examples of such applications include electrical contacts to nanoparticles in electro-optical devices and nanogap-enabled chemical sensors. Herein, we present a versatile approach to fabricate extended and highly ordered arrays of fully alloyed Ag/Au nanoparticles on solid substrates that can be easily expanded to other binary and even higher alloys. The strategy is demonstrated by fabricating Ag/Au alloys with Ag compositions ranging from 0% to 100%. As expected, the plasmon resonance of the alloyed nanoparticles could be varied between those of pristine Au and Ag. The width of the plasmon resonance was significantly smaller compared to those of partially low-temperature alloyed mixtures presented previously. Finally, a Cu2O semiconductor shell was grown on the alloy core to demonstrate that the resulting nanoparticle surfaces are accessible for functionalization, therefore broadening the potential applications of the material.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Fabrication of Large-Area Fully Alloyed Ag/Au Nanoparticle Arrays

Babawale,

Gundlach

2023

ACS Appl. Nano Mater.

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“…Typically, these complex Cu 2 O nanocatalysts involve noble metal NPs or metal oxide NPs . Recently, noble metal–Cu 2 O HSs, such as Au, − Ag, ,,,− Pd, ,, and Pt, were proposed as interesting multicomponent photocatalytic materials.…”

Section: Introductionmentioning

confidence: 99%

“…This study presents the formation of heterostructures consisting of copper oxide nanocubes (NCs) wrapping noble metal nanoparticles (Au/Ag/Pd–Cu 2 O HSs) by microwave-assisted synthesis. Most synthetic methods for the Au–Cu 2 O HSs follow a multistep seed-mediated approach. − Here, the two-step microwave-assisted fabrication of these HSs benefits from the MW selectivity, and importantly, the overall time of this synthesis route is less than 40 min. First, metal NPs are synthesized through a polyol approach, and these NPs serve as nucleation seeds for a cubic Cu 2 O wrapping.…”

Section: Introductionmentioning

confidence: 99%

Copper Oxide Nanocubes Wrapping Metals by Microwave Synthesis

Torras

Roig

2021

Crystal Growth & Design

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Copper and copper oxide nanoparticles (NPs) are industrially important. In particular, Cu-based nanocatalysts find applicability in electrocatalysis and photocatalysis, profiting from the accessible oxidation states of copper and a band gap in the visible region of the Cu 2 O phase. However, in this case, the fast recombination of the charge carriers compromises the final photocatalytic efficiency. The combination of Cu 2 O with metals often results in higher and more stable photocatalytic efficiency. Here, the fabrication of noble metal NPs [Au, Ag, Pd, and Pt] and Cu 2 O heterostructures (HSs) by a microwave (MW)-assisted synthesis is presented. The selectivity of the MW technique with a fast two-step protocol enabled us to easily prepare these multicomponent nanoparticles in a short time (∼40 min). First, metal NPs (Au, Ag, or Pd) are synthesized through a MW-assisted polyol approach, and these NPs serve as nucleation seeds for cubic Cu 2 O wrapping. Other types of heterostructures were found when using smaller Pt NPs instead. Focusing on Au NPs as the core, we analyzed the effect of the gold to copper molar ratio on the shape yield of the nanocubes, reported their optic and plasmonic properties, and demonstrated the reproducibility and scalability of the synthetic routes. Here, we are providing a pioneering example of MW heating as a non-conventional energy source for a general chemical approach to attain a family of complex metal/metal oxide heterostructures.

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Regulating Charge Separation Via Periodic Array Nanostructures for Plasmon‐Enhanced Water Oxidation

Gao,

Zhu,

Zhao

et al. 2024

Advanced Materials

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Plasmonic resonance intensity in metallic nanostructures plays a crucial role in charge generation and separation, directly affecting plasmon‐induced photocatalytic activity. Engineering strategies to enhance plasmonic effects involve designing specific nanostructures, such as triangular nanoplates with sharp corners or dimer nanostructures with hot spots. However, these approaches often lead to a trade‐off between enhanced plasmonic intensity and resonance energy, which ultimately determines local charge density and photocatalytic performance. Here, inspired by theoretical predications, it is shown that a flexibly controlled plasmonic photocatalyst, consisting of an ordered array of Au nanoparticles on a SrTiO3 surface, exhibits an enhanced surface plasmon resonance (SPR) intensity while maintaining a constant SPR resonant energy, due to the presence of surface lattice resonance. This trade‐off results in improved charge separation efficiency and an increase in local charge density at catalytically active sites, as verified by theoretical simulations, surface photovoltage microscopy, and ultrafast transient absorption spectroscopy. Moreover, the optimized periodic photocatalyst shows a 7‐fold increase in water oxidation activity over disordered nanostructures. This work provides a novel approach for balancing the intensity and energy of SPR, which will contribute to optimizing photocatalytic activity on plasmonic platforms.

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A versatile strategy for controlled assembly of plasmonic metal/semiconductor hemispherical nano-heterostructure arrays

Abstract: Recent advances in manipulating plasmonic properties of metal/semiconductor heterostructures have opened up new avenues for basic research and applications. Herein, we present a versatile strategy for the assembly of arrays...

Cited by 4 publications

References 76 publications

Fabrication of Large-Area Fully Alloyed Ag/Au Nanoparticle Arrays

Fabrication of Large-Area Fully Alloyed Ag/Au Nanoparticle Arrays

Copper Oxide Nanocubes Wrapping Metals by Microwave Synthesis

Regulating Charge Separation Via Periodic Array Nanostructures for Plasmon‐Enhanced Water Oxidation

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