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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.


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Synthesis process of the 3D urchin-like hierarchical TiO2nanostructures decorated with magnetically bimetallic core-shell nanostructures.
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Fig1: Synthesis process of the 3D urchin-like hierarchical TiO2nanostructures decorated with magnetically bimetallic core-shell nanostructures.

Mentions: The synthesis process of the 3D urchin-like hierarchical Co@Au/TiO2 or Co@Ag/TiO2 nanostructures is shown schematically in Figure 1. Firstly, the urchin-like hierarchical TiO2 nanostructures with diameters 1 to 4 μm are obtained by a solvothermal method [12,13]. Secondly, the surface of the urchin-like TiO2 is implanted with Pd nanodots by activating treatment. The Pd nanodots will act as a catalyst for the next electroless plating of Co nanoparticles. Thirdly, Co nanoparticles are deposited around the Pd active centers in an electroless plating solution to obtain Co/TiO2. Finally, the Co/TiO2 particles are dispersed into AgNO3 solution or HAuCl4 solution. Owing to the presence of seed Co nanodots, Ag+ or Au3+ is reduced and Ag or Au shell is deposited outside the Co nanodots. Thus, 3D urchin-like hierarchical Co@Au/TiO2 or Co@Ag/TiO2 nanostructures are formed by in situ replacement.Figure 1


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)

Synthesis process of the 3D urchin-like hierarchical TiO2nanostructures decorated with magnetically bimetallic core-shell nanostructures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385119&req=5

Fig1: Synthesis process of the 3D urchin-like hierarchical TiO2nanostructures decorated with magnetically bimetallic core-shell nanostructures.
Mentions: The synthesis process of the 3D urchin-like hierarchical Co@Au/TiO2 or Co@Ag/TiO2 nanostructures is shown schematically in Figure 1. Firstly, the urchin-like hierarchical TiO2 nanostructures with diameters 1 to 4 μm are obtained by a solvothermal method [12,13]. Secondly, the surface of the urchin-like TiO2 is implanted with Pd nanodots by activating treatment. The Pd nanodots will act as a catalyst for the next electroless plating of Co nanoparticles. Thirdly, Co nanoparticles are deposited around the Pd active centers in an electroless plating solution to obtain Co/TiO2. Finally, the Co/TiO2 particles are dispersed into AgNO3 solution or HAuCl4 solution. Owing to the presence of seed Co nanodots, Ag+ or Au3+ is reduced and Ag or Au shell is deposited outside the Co nanodots. Thus, 3D urchin-like hierarchical Co@Au/TiO2 or Co@Ag/TiO2 nanostructures are formed by in situ replacement.Figure 1

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