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Bimetallic core/shell nanoparticle-decorated 3D urchin-like hierarchical TiO2 nanostructures with magneto-responsive and decolorization characteristics.

Xiang L, Liu S, Yin J, Zhao X - Nanoscale Res Lett (2015)

Bottom Line: The morphology and structure are characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, and a surface area analyzer.It demonstrates that Co@Au and Co@Ag nanoparticles are uniformly decorated on urchin-like TiO2 nanostructures.The composite nanostructures show not only surface plasmon absorption band from Au or Ag but also a magneto-responsive characteristic from Co.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Physics, Smart Materials Laboratory, Northwestern Polytechnical University, Xi'an, 710072 China.

ABSTRACT
The semiconductors decorated with noble metals or magnetic metals have attracted increasing attention due to multifunctional properties. In this article, we prepare novel bimetallic core/shell nanoparticle (Co@Au and Co@Ag)-decorated 3D urchin-like hierarchical TiO2 nanostructures through combining electroless plating and in situ replacement processes. The morphology and structure are characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, and a surface area analyzer. It demonstrates that Co@Au and Co@Ag nanoparticles are uniformly decorated on urchin-like TiO2 nanostructures. The composite nanostructures show not only surface plasmon absorption band from Au or Ag but also a magneto-responsive characteristic from Co. This allows composite nanostructures to exhibit advantages including enhanced decolorization efficiency compared to pure TiO2 nanostructures and facile separation from a solution by magnetic field.

No MeSH data available.


Related in: MedlinePlus

Typical morphology, structure, and composition of the hierarchical Co@Ag/TiO2. SEM images (a, b), TEM images (c, d), and high-resolution TEM images (e, f), the local elemental mapping (g), and corresponding EDX spectra of the nanoparticles on the tips of TiO2 nanorods (h) for the 3D urchin-like hierarchical Ag@Co/TiO2 nanostructures. (Scale bar = 1 μm for (a-b); scale bar = 500 nm for (c); scale bar =200 nm for (d); scale bar = 100 nm for (e); scale bar = 20 nm for (f-g)).
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Fig4: Typical morphology, structure, and composition of the hierarchical Co@Ag/TiO2. SEM images (a, b), TEM images (c, d), and high-resolution TEM images (e, f), the local elemental mapping (g), and corresponding EDX spectra of the nanoparticles on the tips of TiO2 nanorods (h) for the 3D urchin-like hierarchical Ag@Co/TiO2 nanostructures. (Scale bar = 1 μm for (a-b); scale bar = 500 nm for (c); scale bar =200 nm for (d); scale bar = 100 nm for (e); scale bar = 20 nm for (f-g)).

Mentions: Figure 4 shows the morphology and the structure of a typical sample of Co@Ag /TiO2 with a mole ratio of AgNO3:CoCl2:TiO2 = 0.03:0.1:1. The SEM images (Figure 4a, b) show many light nanodots are adsorbed on urchin-like TiO2 microspheres with the diameters about 3 μm. The TEM images (Figure 4c, d, e, f) show the nanodots cover on TiO2 nanorods homogeneously, and the average diameters of the nanodots are about 10 to 20 nm. The composition and structure of nanoparticles on the tips of TiO2 nanorods are mainly composed of Ti, Sn, Pd, Co, and Ag elements as shown in Figure 4g, h. The content of Ti, Sn, Pd, Co, and Ag is 48.16, 1.46, 1.15, 36.96, and 12.27 at%, respectively.Figure 4


Bimetallic core/shell nanoparticle-decorated 3D urchin-like hierarchical TiO2 nanostructures with magneto-responsive and decolorization characteristics.

Xiang L, Liu S, Yin J, Zhao X - Nanoscale Res Lett (2015)

Typical morphology, structure, and composition of the hierarchical Co@Ag/TiO2. SEM images (a, b), TEM images (c, d), and high-resolution TEM images (e, f), the local elemental mapping (g), and corresponding EDX spectra of the nanoparticles on the tips of TiO2 nanorods (h) for the 3D urchin-like hierarchical Ag@Co/TiO2 nanostructures. (Scale bar = 1 μm for (a-b); scale bar = 500 nm for (c); scale bar =200 nm for (d); scale bar = 100 nm for (e); scale bar = 20 nm for (f-g)).
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4385119&req=5

Fig4: Typical morphology, structure, and composition of the hierarchical Co@Ag/TiO2. SEM images (a, b), TEM images (c, d), and high-resolution TEM images (e, f), the local elemental mapping (g), and corresponding EDX spectra of the nanoparticles on the tips of TiO2 nanorods (h) for the 3D urchin-like hierarchical Ag@Co/TiO2 nanostructures. (Scale bar = 1 μm for (a-b); scale bar = 500 nm for (c); scale bar =200 nm for (d); scale bar = 100 nm for (e); scale bar = 20 nm for (f-g)).
Mentions: Figure 4 shows the morphology and the structure of a typical sample of Co@Ag /TiO2 with a mole ratio of AgNO3:CoCl2:TiO2 = 0.03:0.1:1. The SEM images (Figure 4a, b) show many light nanodots are adsorbed on urchin-like TiO2 microspheres with the diameters about 3 μm. The TEM images (Figure 4c, d, e, f) show the nanodots cover on TiO2 nanorods homogeneously, and the average diameters of the nanodots are about 10 to 20 nm. The composition and structure of nanoparticles on the tips of TiO2 nanorods are mainly composed of Ti, Sn, Pd, Co, and Ag elements as shown in Figure 4g, h. The content of Ti, Sn, Pd, Co, and Ag is 48.16, 1.46, 1.15, 36.96, and 12.27 at%, respectively.Figure 4

Bottom Line: The morphology and structure are characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, and a surface area analyzer.It demonstrates that Co@Au and Co@Ag nanoparticles are uniformly decorated on urchin-like TiO2 nanostructures.The composite nanostructures show not only surface plasmon absorption band from Au or Ag but also a magneto-responsive characteristic from Co.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Physics, Smart Materials Laboratory, Northwestern Polytechnical University, Xi'an, 710072 China.

ABSTRACT
The semiconductors decorated with noble metals or magnetic metals have attracted increasing attention due to multifunctional properties. In this article, we prepare novel bimetallic core/shell nanoparticle (Co@Au and Co@Ag)-decorated 3D urchin-like hierarchical TiO2 nanostructures through combining electroless plating and in situ replacement processes. The morphology and structure are characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, and a surface area analyzer. It demonstrates that Co@Au and Co@Ag nanoparticles are uniformly decorated on urchin-like TiO2 nanostructures. The composite nanostructures show not only surface plasmon absorption band from Au or Ag but also a magneto-responsive characteristic from Co. This allows composite nanostructures to exhibit advantages including enhanced decolorization efficiency compared to pure TiO2 nanostructures and facile separation from a solution by magnetic field.

No MeSH data available.


Related in: MedlinePlus