Catalytically active and thermally stable core–shell gold–silica nanorods for CO oxidation

Chen, Yidong; Lerch, Sarah; Say, Zafer; Tiburski, Christopher; Langhammer, Christoph; Moth‐Poulsen, Kasper

doi:10.1039/d1ra01577j

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…For example, ultrasmall noble-metal NCs embedded within a microporous inorganic matrix can serve as thermally stable supported catalysts during gas-phase reactions , and demonstrate superior stability as compared with NCs modified inside mesopores, tubes, or layers, where free-to-move NCs can lose their reactivity upon sintering. ,, In recent years, the encapsulation of noble-metal NCs within inorganic oxides with a core–shell configuration has been extensively investigated. − The main function of the encapsulating shell material is to act as a physical shield that prevents the coalescence of metal NCs, suppressing their further growth and inducing interfacial metal–support interactions, which alter the catalytic activity. ,− To implement NSC-SSRs, the outside barrier (shell) must be sufficiently thermally, chemically, and mechanically strong to sustain the harsh thermal reaction conditions while being sufficiently porous to allow gaseous transport. In this regard, silica is a suitable nanosized material for use as an embedding medium owing to its good thermal stability, chemical inertness, tunable porosity, facile synthesis, and ability to form a tight conformal shell around a wide range of NCs. ,,− After the reaction, silica can be easily removed by hydrolytic etching, leading to surfactant-free NCs for further applications. Within the scope of NSC-SSR research to date, the major focus has been on SiO 2 nanospheres embedded with different metal ions and/or NCs, which are subjected to high-temperature (>500 °C) redox conditions.…”

Section: Ssrs For the Synthesis Of Nanomaterialsmentioning

confidence: 99%

Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

et al. 2022

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Nanomaterials (NMs) with unique structures and compositions can give rise to exotic physicochemical properties and applications. Despite the advancement in solution-based methods, scalable access to a wide range of crystal phases and intricate compositions is still challenging. Solid-state reaction (SSR) syntheses have high potential owing to their flexibility toward multielemental phases under feasibly high temperatures and solvent-free conditions as well as their scalability and simplicity. Controlling the nanoscale features through SSRs demands a strategic nanospace-confinement approach due to the risk of heat-induced reshaping and sintering. Here, we describe advanced SSR strategies for NM synthesis, focusing on mechanistic insights, novel nanoscale phenomena, and underlying principles using a series of examples under different categories. After introducing the history of classical SSRs, key theories, and definitions central to the topic, we categorize various modern SSR strategies based on the surrounding solid-state media used for nanostructure growth, conversion, and migration under nanospace or dimensional confinement. This comprehensive review will advance the quest for new materials design, synthesis, and applications.

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Section: Ssrs For the Synthesis Of Nanomaterialsmentioning

confidence: 99%

Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

et al. 2022

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“…Mesoporous silica is therefore a promising carrier material. Applications include catalysis [9,10], drug transport [11,12], separation, adsorbents [13,14], electrochemical [15,16], optical sensing, and photocatalysts, among many others. The most widely studied mesoporous silica nanoparticles are MCM-41 and SBA-15, which have mesoporous ordered structures and uniform pore sizes [17,18].…”

Section: Introductionmentioning

confidence: 99%

Silica-based mesoporous ion-imprinted fluorescent sensors for the detection of Pb²⁺ in aqueous environments

Xu¹,

Lü²,

Wu³

et al. 2022

Nanotechnology

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In this work, an environment-friendly core-shell material based on CDs@SiO2 as the core and mesoporous ion-imprinted layer as the shell was reported. As a highly sensitive and accurate fluorescent sensor for the detection of Pb2+ in environmental water, the composition combined ion imprinting technology with quantum dots to selectively quench the fluorescence of CDs by metal coordination in the presence of Pb2+, and the visual change of gradually weakening blue color could be observed by the naked eye for visual detection. The mesoporous structure significantly improved the detection recognition rate of CDs@SiO2@MIIPs.The molecularly imprinted sensor presented a favorable linear relationship over a Pb2+ concentration range from 10 nmol/L to 100 nmol/L and a detection limit of 2.16 nmol/L for Pb2+. The imprinting factor of the CDs@SiO2@MIIPs was 5.13. The sensor has a fast detection rate, is highly selective in the identification of Pb2+, and can be reused up to 10 times. The applicability of the method was evaluated by the determination of Pb2+ in spiked environmental water samples with satisfactory results.

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“…[21][22][23][24]. Among these SERS-active nanostructures, the plasmonic core-shell-satellite (PCSS) offers several advantages: (i) protection of the plasmonic core from oxidation, (ii) maintenance of the shape of the core even at high temperatures, (iii) tuning of LSPR properties along with the adjustment of core and satellite size, and (iv) maintenance of small nanogaps between plasmonic core and satellite, producing a strong EM field hotspot [25][26][27][28]. Therefore, PCSS exhibited improved SERS performance due to the strong EM field intensity and abundant built-in EM hotspots.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection

Pandey

Kunwar

Shin

et al. 2021

IJMS

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In this work, we develop a Ag@Al2O3@Ag plasmonic core–shell–satellite (PCSS) to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) detection of probe molecules. To fabricate PCSS nanostructures, we employ a simple hierarchical dewetting process of Ag films coupled with an atomic layer deposition (ALD) method for the Al2O3 shell. Compared to bare Ag nanoparticles, several advantages of fabricating PCSS nanostructures are discovered, including high surface roughness, high density of nanogaps between Ag core and Ag satellites, and nanogaps between adjacent Ag satellites. Finite-difference time-domain (FDTD) simulations of the PCSS nanostructure confirm an enhancement in the electromagnetic field intensity (hotspots) in the nanogap between the Ag core and the satellite generated by the Al2O3 shell, due to the strong core–satellite plasmonic coupling. The as-prepared PCSS-based SERS substrate demonstrates an enhancement factor (EF) of 1.7 × 107 and relative standard deviation (RSD) of ~7%, endowing our SERS platform with highly sensitive and reproducible detection of R6G molecules. We think that this method provides a simple approach for the fabrication of PCSS by a solid-state technique and a basis for developing a highly SERS-active substrate for practical applications.

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Catalytically active and thermally stable core–shell gold–silica nanorods for CO oxidation

Abstract: Gold nanorods stabilized with mesoporous silica shells are characterized and used as the catalyst for a model CO oxidation reaction to counter the costly sintering phenomena found in many industrial nanoparticle catalysts.

Cited by 4 publications

References 45 publications

Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

Silica-based mesoporous ion-imprinted fluorescent sensors for the detection of Pb²⁺ in aqueous environments

Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection

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Catalytically active and thermally stable core–shell gold–silica nanorods for CO oxidation

Abstract: Gold nanorods stabilized with mesoporous silica shells are characterized and used as the catalyst for a model CO oxidation reaction to counter the costly sintering phenomena found in many industrial nanoparticle catalysts.

Cited by 4 publications

References 45 publications

Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

Solid-State Reaction Synthesis of Nanoscale Materials: Strategies and Applications

Silica-based mesoporous ion-imprinted fluorescent sensors for the detection of Pb2+ in aqueous environments

Plasmonic Core–Shell–Satellites with Abundant Electromagnetic Hotspots for Highly Sensitive and Reproducible SERS Detection

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Product

Resources

About

Silica-based mesoporous ion-imprinted fluorescent sensors for the detection of Pb²⁺ in aqueous environments