Absorption spectra and near-electric field enhancement effects of Au- and Ag-Fe3O4 dimers

Wang, Benyang; Qu, Shiliang

doi:10.1016/j.apsusc.2013.12.103

Cited by 19 publications

(9 citation statements)

References 46 publications

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“…In other words, the larger the particle size, the larger is the local electric field. Wang et al very recently calculated that a local field enhancement factor |E| 2 /|E o | 2 of 5.3 can be obtained for Au/Fe 2 O 3 system with Au particle size in 13-20 nm range with respect to Au particle size in 3.5-13 nm range [79]. This also indicates the absence of appreciable influence of hot electrons in the catalytic reaction as production of hot electrons is dominant process for smaller nanostructures [80][81][82].…”

Section: Resultsmentioning

confidence: 91%

On the role of metal particle size and surface coverage for photo-catalytic hydrogen production: A case study of the Au/CdS system

Majeed

Nadeem

Al-Oufi

et al. 2016

Applied Catalysis B: Environmental

126

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Section: Resultsmentioning

confidence: 91%

On the role of metal particle size and surface coverage for photo-catalytic hydrogen production: A case study of the Au/CdS system

Majeed

Nadeem

Al-Oufi

et al. 2016

Applied Catalysis B: Environmental

126

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“…The specific structure and morphology of the developed Fe 3 O 4 -Au magnetic nanocomposites were studied by TEM and SEM. In particular, TEM measurement is an effective methodology for structure research in materials science and materials engineering [ 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 ]. Figure 3 displays SEM and TEM images of pure Fe 3 O 4 hollow microspheres.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

et al. 2018

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In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe3O4-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe3O4 hollow microspheres and Fe3O4-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe3O4-Au magnetic nanocomposites. By adjusting the quantity of Au seeds coating on the polyethyleneimine-dithiocarbamates (PEI-DTC)-modified surfaces of Fe3O4 hollow microspheres, the correlation between the amount of Au seeds and the catalytic ability of Fe3O4-Au magnetic nanocomposites for 4-nitrophenol (4-NP) is investigated systematically. Importantly, bearing remarkable recyclable features, our developed Fe3O4-Au magnetic nanocomposites can be readily separated with a magnet. Such Fe3O4-Au magnetic nanocomposites shine the light on highly efficient catalysts for 4-NP reduction at the mass production level.

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“…The morphology and detailed structure of the samples were investigated by SEM and TEM. In particular, the TEM technique is a direct and important methodology for structure analysis in the materials engineering technologies [ 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 ]. Figure 4 shows typical low-magnification TEM images of pure FePt nanocrystals, pure silver colloids, and FePt–Ag 5 mg–60 mL and FePt–Ag 10 mg–60 mL nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

et al. 2018

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Nowadays, synthetic organic dyes and pigments discharged from numerous industries are causing unprecedentedly severe water environmental pollution, and conventional water treatment processes are hindered due to the corresponding sophisticated aromatic structures, hydrophilic nature, and high stability against light, temperature, etc. Herein, we report an efficient fabrication strategy to develop a new type of highly efficient, low-cost, and magnetically recoverable nanocatalyst, i.e., FePt–Ag nanocomposites, for the reduction of methyl orange (MO) and rhodamine B (RhB), by a facile seed deposition process. X-ray diffraction results elaborate that the as-synthesized FePt–Ag nanocomposites are pure disordered face-centered cubic phase. Transmission electron microscopy studies demonstrate that the amount of Ag seeds deposited onto the surfaces of FePt nanocrystals increases when increasing the additive amount of silver colloids. The linear correlation of the MO and RhB concentration versus reaction time catalyzed by FePt–Ag nanocatalysts is in line with pseudo-first-order kinetics. The reduction rate constants of MO and RhB increase with the increase of the amount of Ag seeds. FePt–Ag nanocomposites show good separation ability and reusability, and could be repeatedly applied for nearly complete reduction of MO and RhB for at least six successive cycles. Such cost-effective and recyclable nanocatalysts provide a new material family for use in environmental protection applications.

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Absorption spectra and near-electric field enhancement effects of Au- and Ag-Fe3O4 dimers

Cited by 19 publications

References 46 publications

On the role of metal particle size and surface coverage for photo-catalytic hydrogen production: A case study of the Au/CdS system

On the role of metal particle size and surface coverage for photo-catalytic hydrogen production: A case study of the Au/CdS system

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

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