Magnetic-Assembly Mechanism of Superparamagneto-Plasmonic Nanoparticles on a Charged Surface

Tran, Van Tan; Zhou, Hongjian; Lee, Seunghun; Hong, Seong-Wook; Kim, Jeonghyo; Jeong, Se–Young; Lee, Jaebeom

doi:10.1021/acsami.5b00904

Cited by 22 publications

(30 citation statements)

References 52 publications

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“…Clearly, the gold seeds are randomly and homogeneously attached to the surfaces of the Fe 3 O 4 hollow microspheres. Gold seeds are seen black, and Fe 3 O 4 hollow microspheres present a light color in the TEM images, attributed to the higher electron density of Au compared to that of Fe 3 O 4 [ 72 ]. It can be easily observed from the high-resolution TEM (HRTEM) image in the inset of Figure 4 b that the interplanar distance values are 0.204 and 0.217 nm, matching the (220) lattice plane of Fe 3 O 4 and the (111) lattice plane of Au, respectively [ 73 ].…”

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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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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“…However, the Au NPs are fairly dispersed on the hydrophobic PDMS surfaces. This dispersion is attributed to the hydrodynamic interactions between the particles and substrate, which induce long-range attractive forces between the identically charged surfaces of the Au NPs and the substrate44.…”

Section: Resultsmentioning

confidence: 99%

In situ self-assembly of gold nanoparticles on hydrophilic and hydrophobic substrates for influenza virus-sensing platform

Ahmed

Kim

Tran

et al. 2017

Sci Rep

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104

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Nanomaterials without chemical linkers or physical interactions that reside on a two-dimensional surface are attractive because of their electronic, optical and catalytic properties. An in situ method has been developed to fabricate gold nanoparticle (Au NP) films on different substrates, regardless of whether they are hydrophilic or hydrophobic surfaces, including glass, 96-well polystyrene plates, and polydimethylsiloxane (PDMS). A mixture of sodium formate (HCOONa) and chloroauric acid (HAuCl4) solution was used to prepare Au NP films at room temperature. An experimental study of the mechanism revealed that film formation is dependent on surface wettability and inter particle attraction. The as-fabricated Au NP films were further applied to the colorimetric detection of influenza virus. The response to the commercial target, New Caledonia/H1N1/1999 influenza virus, was linear in the range from 10 pg/ml to 10 μg/ml and limit of detection was 50.5 pg/ml. In the presence of clinically isolated influenza A virus (H3N2), the optical density of developed color was dependent on the virus concentration (10–50,000 PFU/ml). The limit of detection of this study was 24.3 PFU/ml, a limit 116 times lower than that of conventional ELISA (2824.3 PFU/ml). The sensitivity was also 500 times greater than that of commercial immunochromatography kits.

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“…22 Figure 3(a) and (c) show optical microscopic images in dark-field mode about the random deposition of COSH-NPs and YOSH-NPs. In order to characterize the optical property of onedimensionally aligned nanostructure using COSH and YOSH-NPs, respective COSH and YOSH-NPs were resided on a PDDA-coated glass substrate under the static magnetic field.…”

Section: Optical Anisotropicity Of Core-shell or Yolk-shell Nanochainsmentioning

confidence: 99%

Optical Anisotropicity of Core‐Shell or Yolk‐Shell‐typed Ag@Fe₃O₄ Nanochains

Tran

Kim

et al. 2018

Bulletin Korean Chem Soc

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Optical anisotropicity of 1-dimensional nanochains of yolk-shell (YOSH) and core-shell (COSH) Ag@Fe 3 O 4 nanoparticles (NPs) is attractive to comprehend electromagnetic relation in different materials in nanoscale regime. To investigate its unique properties, a YOSH Ag@Fe 3 O 4 nanoscale superstructure is prepared through a successive process using COSH-NPs via a selective etching approach. The Ag-core can be etched when exposed to a mixture of polyvinylpyrrolidone (PVP) and hydrogen peroxide (H 2 O 2 ) solution at 25 C. It is investigated that the etching degree of Ag-core in the COSH-NPs is linearly correlated with the average molecular weight and amount of PVP and H 2 O 2 . In the optical investigation, one-dimensional YOSH and COSH nanochains are compared to show the dependence of anisotropic plasmonic response on tuning polarized light angle. The YOSH nanochain shows an insensitive plasmonic shift in respect of varying refractive index of solvent, which is probably related with the void of Ag-yolk and Fe 3 O 4 shell. It is probable that the unique properties of the COSH and YOSH nanochain can be applied to be a potential photonic device and their ultralow quantity sensing and imaging.

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Magnetic-Assembly Mechanism of Superparamagneto-Plasmonic Nanoparticles on a Charged Surface

Cited by 22 publications

References 52 publications

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

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

In situ self-assembly of gold nanoparticles on hydrophilic and hydrophobic substrates for influenza virus-sensing platform

Optical Anisotropicity of Core‐Shell or Yolk‐Shell‐typed Ag@Fe₃O₄ Nanochains

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Magnetic-Assembly Mechanism of Superparamagneto-Plasmonic Nanoparticles on a Charged Surface

Cited by 22 publications

References 52 publications

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

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

In situ self-assembly of gold nanoparticles on hydrophilic and hydrophobic substrates for influenza virus-sensing platform

Optical Anisotropicity of Core‐Shell or Yolk‐Shell‐typed Ag@Fe3O4 Nanochains

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Optical Anisotropicity of Core‐Shell or Yolk‐Shell‐typed Ag@Fe₃O₄ Nanochains