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Size Control and Growth Process Study of Au@Cu 2 O Particles

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ABSTRACT

Au@Cu2O cuboctahedron with gold triangular nanoplate core and Cu2O shell was synthesized by a chemical method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) tests demonstrated that the as-synthesis samples were consisted of gold triangular nanoplate core and Cu2O shell, and both of them were in good crystallization. The effective size control of the particles could be realized by controlling the amount of Au cores added in the synthetic process and Au@Cu2O particles with different shell thickness could be synthesized. The decrease of Cu2O shell thickness had a great difference in the optical performance, including blue shift of the resonant peaks and enhanced absorption intensity. The growth process from rough sheet structure to cuboctahedron was also explored. The results of photocatalytic degradation experiment showed that Au@Cu2O particles showed much better photocatalytic performance than that of pure Cu2O. The improved photocatalytic property of the Au@Cu2O particles was attributed to the comprehensive effect of the enhanced visible-light absorption and high separation rate of electron-hole pairs.

Electronic supplementary material: The online version of this article (doi:10.1186/s11671-016-1603-6) contains supplementary material, which is available to authorized users.

No MeSH data available.


Schematic presentation for the growth process of the Au@Cu2O particles
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Fig3: Schematic presentation for the growth process of the Au@Cu2O particles

Mentions: To explore the growth process of the samples, a series of experiments had been done. When 3.2 ml of Au solution was added, particles with rough sheet structure were synthesized (as shown in Fig. 3), instead of expected cuboctahedron smaller than 53-nm Au@Cu2O, because Au cores were too much to capture enough Cu2O particles for the growth of complete cuboctahedron shell. When 2.4 ml of Au TN was added, every Au core was provided with more Cu2O particles. And the intermediate structure was synthesized because more Cu2O particles could adsorb on the surfaces of Au TN core. When the volume of Au TN was decreased to 1.6 ml, complete cuboctahedron was synthesized. As the volume of Au TN sequentially decreased, the morphology of the Au@Cu2O core-shell structure was maintained as cuboctahedron with particle size increasing.Fig. 3


Size Control and Growth Process Study of Au@Cu 2 O Particles
Schematic presentation for the growth process of the Au@Cu2O particles
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5016315&req=5

Fig3: Schematic presentation for the growth process of the Au@Cu2O particles
Mentions: To explore the growth process of the samples, a series of experiments had been done. When 3.2 ml of Au solution was added, particles with rough sheet structure were synthesized (as shown in Fig. 3), instead of expected cuboctahedron smaller than 53-nm Au@Cu2O, because Au cores were too much to capture enough Cu2O particles for the growth of complete cuboctahedron shell. When 2.4 ml of Au TN was added, every Au core was provided with more Cu2O particles. And the intermediate structure was synthesized because more Cu2O particles could adsorb on the surfaces of Au TN core. When the volume of Au TN was decreased to 1.6 ml, complete cuboctahedron was synthesized. As the volume of Au TN sequentially decreased, the morphology of the Au@Cu2O core-shell structure was maintained as cuboctahedron with particle size increasing.Fig. 3

View Article: PubMed Central - PubMed

ABSTRACT

Au@Cu2O cuboctahedron with gold triangular nanoplate core and Cu2O shell was synthesized by a chemical method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) tests demonstrated that the as-synthesis samples were consisted of gold triangular nanoplate core and Cu2O shell, and both of them were in good crystallization. The effective size control of the particles could be realized by controlling the amount of Au cores added in the synthetic process and Au@Cu2O particles with different shell thickness could be synthesized. The decrease of Cu2O shell thickness had a great difference in the optical performance, including blue shift of the resonant peaks and enhanced absorption intensity. The growth process from rough sheet structure to cuboctahedron was also explored. The results of photocatalytic degradation experiment showed that Au@Cu2O particles showed much better photocatalytic performance than that of pure Cu2O. The improved photocatalytic property of the Au@Cu2O particles was attributed to the comprehensive effect of the enhanced visible-light absorption and high separation rate of electron-hole pairs.

Electronic supplementary material: The online version of this article (doi:10.1186/s11671-016-1603-6) contains supplementary material, which is available to authorized users.

No MeSH data available.