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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.


SEM images of the samples synthesized by adding (a) 0 ml (b) 0.1 ml (c) 0.2 ml (d) 0.4 ml synthesized by adding (e) 0.8 ml (f) 1.6 ml of gold core solution
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Fig2: SEM images of the samples synthesized by adding (a) 0 ml (b) 0.1 ml (c) 0.2 ml (d) 0.4 ml synthesized by adding (e) 0.8 ml (f) 1.6 ml of gold core solution

Mentions: SEM images of the samples (Fig. 2a–f) showed that particles with six different sizes were synthesized by adding 0, 0.1, 0.2, 0.4, 0.8, and 1.6 ml of Au core solution, respectively. Accordingly, the average particle sizes of the samples were estimated to be 555 nm, 349 nm, 281 nm, 225 nm, 176 nm, and 137 nm, respectively.Considering the average particle size of the Au TN was 31 nm (Additional file 1: Figure S1b), the average shell thickness of the samples was 159, 125, 97, 72.5, and 53 nm, respectively. Therefore, accurate size control could be realized, due to the fact that each Au@Cu2O core-shell structure contained one Au core [25]. As a result, a simple method was provided to adjust the thickness of Cu2O shell by altering the amount of the Au core in the synthetic process. The Au TN employed in the synthetic process was from the same batch, so the concentration of the seeds was invariable.Fig. 2


Size Control and Growth Process Study of Au@Cu 2 O Particles
SEM images of the samples synthesized by adding (a) 0 ml (b) 0.1 ml (c) 0.2 ml (d) 0.4 ml synthesized by adding (e) 0.8 ml (f) 1.6 ml of gold core solution
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig2: SEM images of the samples synthesized by adding (a) 0 ml (b) 0.1 ml (c) 0.2 ml (d) 0.4 ml synthesized by adding (e) 0.8 ml (f) 1.6 ml of gold core solution
Mentions: SEM images of the samples (Fig. 2a–f) showed that particles with six different sizes were synthesized by adding 0, 0.1, 0.2, 0.4, 0.8, and 1.6 ml of Au core solution, respectively. Accordingly, the average particle sizes of the samples were estimated to be 555 nm, 349 nm, 281 nm, 225 nm, 176 nm, and 137 nm, respectively.Considering the average particle size of the Au TN was 31 nm (Additional file 1: Figure S1b), the average shell thickness of the samples was 159, 125, 97, 72.5, and 53 nm, respectively. Therefore, accurate size control could be realized, due to the fact that each Au@Cu2O core-shell structure contained one Au core [25]. As a result, a simple method was provided to adjust the thickness of Cu2O shell by altering the amount of the Au core in the synthetic process. The Au TN employed in the synthetic process was from the same batch, so the concentration of the seeds was invariable.Fig. 2

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.