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High-purity Cu nanocrystal synthesis by a dynamic decomposition method.

Jian X, Cao Y, Chen G, Wang C, Tang H, Yin L, Luan C, Liang Y, Jiang J, Wu S, Zeng Q, Wang F, Zhang C - Nanoscale Res Lett (2014)

Bottom Line: The growth was found to be influenced by the factors of reaction temperature, protective gas, and time.High crystalline Cu nanocrystals without floccules were obtained from thermal decomposition of cupric tartrate at 271°C for 8 h under Ar.This general approach paves a way to controllable synthesis of Cu nanocrystals with high purity.

View Article: PubMed Central - PubMed

Affiliation: Clean Energy Materials and Engineering Center, School of Energy Science and Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Avenue, West Hi-Tech Zone, Chengdu, 611731, China, jianxian@uestc.edu.cn.

ABSTRACT
Cu nanocrystals are applied extensively in several fields, particularly in the microelectron, sensor, and catalysis. The catalytic behavior of Cu nanocrystals depends mainly on the structure and particle size. In this work, formation of high-purity Cu nanocrystals is studied using a common chemical vapor deposition precursor of cupric tartrate. This process is investigated through a combined experimental and computational approach. The decomposition kinetics is researched via differential scanning calorimetry and thermogravimetric analysis using Flynn-Wall-Ozawa, Kissinger, and Starink methods. The growth was found to be influenced by the factors of reaction temperature, protective gas, and time. And microstructural and thermal characterizations were performed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and differential scanning calorimetry. Decomposition of cupric tartrate at different temperatures was simulated by density functional theory calculations under the generalized gradient approximation. High crystalline Cu nanocrystals without floccules were obtained from thermal decomposition of cupric tartrate at 271°C for 8 h under Ar. This general approach paves a way to controllable synthesis of Cu nanocrystals with high purity.

No MeSH data available.


SEM images of product after the decomposition of the cupric tartrate at different temperatures. (a) 200°C, (b) 250°C, (c) 350°C, and (d) 400°C.
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Fig5: SEM images of product after the decomposition of the cupric tartrate at different temperatures. (a) 200°C, (b) 250°C, (c) 350°C, and (d) 400°C.

Mentions: As reflected by the SEM images shown in Figure 5, the Cu nanocrystals obtained from the decomposition of copper tartrate exhibit rather distinguished shapes in the range from 200°C to 400°C. As described in Figure 5a, microparticles are the main decomposition products at 200°C. As the temperature increases to 250°C, the size of the Cu nanocrystals increases remarkably and some floccules can be found among Cu nanocrystals (Figure 5b). Decomposition at 350°C results in a decrease of the floccules, implying a higher purity of the Cu nanocrystals. The Cu nanocrystals become larger with the temperature increases to 350°C and 400°C, as shown in Figure 5c, d. These results indicate that lower decomposition temperatures favor producing Cu nanocrystals with smaller sizes but lower purity. Higher temperatures are favorable for forming Cu nanocrystals with higher purities, but aggregations of the nanocrystals can easily occur.Figure 5


High-purity Cu nanocrystal synthesis by a dynamic decomposition method.

Jian X, Cao Y, Chen G, Wang C, Tang H, Yin L, Luan C, Liang Y, Jiang J, Wu S, Zeng Q, Wang F, Zhang C - Nanoscale Res Lett (2014)

SEM images of product after the decomposition of the cupric tartrate at different temperatures. (a) 200°C, (b) 250°C, (c) 350°C, and (d) 400°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493849&req=5

Fig5: SEM images of product after the decomposition of the cupric tartrate at different temperatures. (a) 200°C, (b) 250°C, (c) 350°C, and (d) 400°C.
Mentions: As reflected by the SEM images shown in Figure 5, the Cu nanocrystals obtained from the decomposition of copper tartrate exhibit rather distinguished shapes in the range from 200°C to 400°C. As described in Figure 5a, microparticles are the main decomposition products at 200°C. As the temperature increases to 250°C, the size of the Cu nanocrystals increases remarkably and some floccules can be found among Cu nanocrystals (Figure 5b). Decomposition at 350°C results in a decrease of the floccules, implying a higher purity of the Cu nanocrystals. The Cu nanocrystals become larger with the temperature increases to 350°C and 400°C, as shown in Figure 5c, d. These results indicate that lower decomposition temperatures favor producing Cu nanocrystals with smaller sizes but lower purity. Higher temperatures are favorable for forming Cu nanocrystals with higher purities, but aggregations of the nanocrystals can easily occur.Figure 5

Bottom Line: The growth was found to be influenced by the factors of reaction temperature, protective gas, and time.High crystalline Cu nanocrystals without floccules were obtained from thermal decomposition of cupric tartrate at 271°C for 8 h under Ar.This general approach paves a way to controllable synthesis of Cu nanocrystals with high purity.

View Article: PubMed Central - PubMed

Affiliation: Clean Energy Materials and Engineering Center, School of Energy Science and Engineering, University of Electronic Science and Technology of China, No. 2006, Xiyuan Avenue, West Hi-Tech Zone, Chengdu, 611731, China, jianxian@uestc.edu.cn.

ABSTRACT
Cu nanocrystals are applied extensively in several fields, particularly in the microelectron, sensor, and catalysis. The catalytic behavior of Cu nanocrystals depends mainly on the structure and particle size. In this work, formation of high-purity Cu nanocrystals is studied using a common chemical vapor deposition precursor of cupric tartrate. This process is investigated through a combined experimental and computational approach. The decomposition kinetics is researched via differential scanning calorimetry and thermogravimetric analysis using Flynn-Wall-Ozawa, Kissinger, and Starink methods. The growth was found to be influenced by the factors of reaction temperature, protective gas, and time. And microstructural and thermal characterizations were performed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and differential scanning calorimetry. Decomposition of cupric tartrate at different temperatures was simulated by density functional theory calculations under the generalized gradient approximation. High crystalline Cu nanocrystals without floccules were obtained from thermal decomposition of cupric tartrate at 271°C for 8 h under Ar. This general approach paves a way to controllable synthesis of Cu nanocrystals with high purity.

No MeSH data available.