Monodisperse Pattern Nanoalloying for Synergistic Intermetallic Catalysis

Mun, Jeong Ho; Chang, Yun Hee; Shin, Dong Ok; Yoon, Jong Moon; Choi, Daeseon; Lee, Kyung-Min; Kim, Ju Young; Keun, Seung; Lee, Jun Young; Jeong, Jong‐Ryul; Kim, Yong Hyun; Kim, Sang Ouk

doi:10.1021/nl403542h

Cited by 61 publications

(55 citation statements)

References 46 publications

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“…However, during the annealing process, the nanocrystals were prone to aggregation, Ostwald ripening, and/or sintering, which inevitably leads to larger particles and broader size distributions . This issue can be addressed by first dispersing the nanocrystals on an inert substrate such as carbon or silica to help immobilize them throughout the heating process and thus inhibit sintering . However, confining structures to a 2D surface ultimately reduces the overall throughput.…”

Section: Synthetic Approaches To Intermetallic Nanocrystalsmentioning

confidence: 99%

Intermetallic Nanocrystals: Syntheses and Catalytic Applications

et al. 2017

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At the forefront of nanochemistry, there exists a research endeavor centered around intermetallic nanocrystals, which are unique in terms of long-range atomic ordering, well-defined stoichiometry, and controlled crystal structure. In contrast to alloy nanocrystals with no elemental ordering, it is challenging to synthesize intermetallic nanocrystals with a tight control over their size and shape. Here, recent progress in the synthesis of intermetallic nanocrystals with controllable sizes and well-defined shapes is highlighted. A simple analysis and some insights key to the selection of experimental conditions for generating intermetallic nanocrystals are presented, followed by examples to highlight the viable use of intermetallic nanocrystals as electrocatalysts or catalysts for various reactions, with a focus on the enhanced performance relative to their alloy counterparts that lack elemental ordering. Within the conclusion, perspectives on future developments in the context of synthetic control, structure-property relationships, and applications are discussed.

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Section: Synthetic Approaches To Intermetallic Nanocrystalsmentioning

confidence: 99%

Intermetallic Nanocrystals: Syntheses and Catalytic Applications

et al. 2017

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“…For example, electron energy loss spectroscopy maps of Au octopods with AuPd tips show spatially localized resonances around the tips [97]. Alternatively, one can sacrifice distinct faceting by conventional alloying techniques like thermal annealing [92,98], or new colloidal synthesis techniques like probe-based lithography [99].…”

Section: Alloysmentioning

confidence: 99%

Bimetallic nanostructures: combining plasmonic and catalytic metals for photocatalysis

Sytwu

Vadai

Dionne

2019

Advances in Physics: X

101

150

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Light has emerged as a promising new reagent in chemical reactions, especially in enhancing the performance of metal nanoparticle catalysts. Certain metal nanoparticles support localized surface plasmon resonances (LSPRs) which convert incident light to strong electromagnetic fields, hot carriers, or heat for directing and improving chemical reactions. By combining plasmonically active metals with traditionally catalytic metals, bimetallic nanostructures promote simultaneous light conversion and strong molecular adsorption, expanding the library of light-controlled reactions. In this review, we cover three bimetallic geometries: antenna-reactor, core-shell, and alloyed nanoparticle systems. Each geometry hosts its own set of intermetallic interactions which can affect the photocatalytic response. While antenna-reactor systems rely exclusively on optical coupling between the plasmonic and catalytic metal to enhance reactivity, core-shell and alloy architectures introduce electronic interactions in addition to optical effects. These electronic interactions usually dampen the plasmonic response but also offer the potential for enhanced reactivity and product specificity. We review both state-of-the-art bimetallic photocatalysts as well as emerging research opportunities, including leveraging quantum effects, new computational methods to understand and predict photocatalysts, and atomic-scale architecting of materials.

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“…A solvent‐free, extremely high‐temperature process in atmospheric conditions enabled by FLA is highly beneficial for a fab‐compatible practical use of the self‐assembly process. 2D large‐area processability potentially integrated with a roll‐to‐roll continuous process may offer an unprecedented opportunity of sub‐10 nm scale nanopatterning for next‐generation nanodevices including electronics, optoelectronics, sensors, catalysts, and so on. Besides, this rapid photothermal process breakthroughs the present process limitation, and will open up the enormous potential for novel design and functionalities of high‐χ BCPs.…”

Section: Properties Of the Bcps Of Low‐χ Sm (Ps‐b‐pmma) S2v (Ps‐b‐p2mentioning

confidence: 99%

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

et al. 2017

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One of the fundamental challenges encountered in successful incorporation of directed self-assembly in sub-10 nm scale practical nanolithography is the process compatibility of block copolymers with a high Flory-Huggins interaction parameter (χ). Herein, reliable, fab-compatible, and ultrafast directed self-assembly of high-χ block copolymers is achieved with intense flash light. The instantaneous heating/quenching process over an extremely high temperature (over 600 °C) by flash light irradiation enables large grain growth of sub-10 nm scale self-assembled nanopatterns without thermal degradation or dewetting in a millisecond time scale. A rapid self-assembly mechanism for a highly ordered morphology is identified based on the kinetics and thermodynamics of the block copolymers with strong segregation. Furthermore, this novel self-assembly mechanism is combined with graphoepitaxy to demonstrate the feasibility of ultrafast directed self-assembly of sub-10 nm nanopatterns over a large area. A chemically modified graphene film is used as a flexible and conformal light-absorbing layer. Subsequently, transparent and mechanically flexible nanolithography with a millisecond photothermal process is achieved leading the way for roll-to-roll processability.

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Monodisperse Pattern Nanoalloying for Synergistic Intermetallic Catalysis

Cited by 61 publications

References 46 publications

Intermetallic Nanocrystals: Syntheses and Catalytic Applications

Intermetallic Nanocrystals: Syntheses and Catalytic Applications

Bimetallic nanostructures: combining plasmonic and catalytic metals for photocatalysis

Flash Light Millisecond Self‐Assembly of High χ Block Copolymers for Wafer‐Scale Sub‐10 nm Nanopatterning

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