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The surface condition effect of Cu2O flower/grass-like nanoarchitectures grown on Cu foil and Cu film.

Hu L, Ju Y, Hosoi A, Tang Y - Nanoscale Res Lett (2013)

Bottom Line: The FGLNAs are approximately 3.5 to 12 μm in size, and their petals are approximately 50 to 950 nm in width.The high compressive stress caused by a large oxide volume in the Cu2O layer on the specimen surface played an important role in the growth of FGLNAs.PACS: 81.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. ju@mech.Nagoya-u.ac.jp.

ABSTRACT
Cu2O flower/grass-like nanoarchitectures (FGLNAs) were fabricated directly on two category specimens of Cu foils and Cu film using thermal oxidation method. The FGLNAs are approximately 3.5 to 12 μm in size, and their petals are approximately 50 to 950 nm in width. The high compressive stress caused by a large oxide volume in the Cu2O layer on the specimen surface played an important role in the growth of FGLNAs. The effects of surface conditions, such as the surface stresses, grain size, and surface roughness of Cu foil and Cu film specimens, on the FGLNA growth were discussed in detail. PACS: 81. Materials science; 81.07.-b Nanoscale materials and structures: fabrication and characterization; 81.16.Hc Catalytic methods.

No MeSH data available.


Related in: MedlinePlus

SEM images of flower-like and grass-like architectures. Flower-like architectures grown on (a) unpolished Cu foil specimen, (b) Cu foil specimen polished using a 400-grit abrasive paper, and (c) Cu film specimen heated at 120°C for 2 h, respectively. Grass-like architectures on (d) unpolished Cu foil specimen, (e) Cu foil specimen polished using a 400-grit abrasive paper, and (f) Cu film specimen heated at 240°C for 2 h, respectively.
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Figure 1: SEM images of flower-like and grass-like architectures. Flower-like architectures grown on (a) unpolished Cu foil specimen, (b) Cu foil specimen polished using a 400-grit abrasive paper, and (c) Cu film specimen heated at 120°C for 2 h, respectively. Grass-like architectures on (d) unpolished Cu foil specimen, (e) Cu foil specimen polished using a 400-grit abrasive paper, and (f) Cu film specimen heated at 240°C for 2 h, respectively.

Mentions: As shown in Figure 1, the FGLNAs grow on the unpolished Cu foil, polished Cu foil, and Cu film substrates after heating at 120°C and 240°C for 2 h. The size of FGLNAs is 3.5 to 12 μm, and the width of their petals is 50 to 950 nm. A heating temperature of 120°C leads to generate flower-like architectures and 240°C leads to generate grass-like architectures. The different heating temperatures induce different stress migration and oxidation speeds, thereby leading to different structures of FGLNAs. It has been confirmed experimentally that there was no FGLNA growth when the experimental conditions were changed to vacuum environment, without catalyst or under the humidity lower than 55% or higher than 75%, respectively. Therefore, it is thought that besides temperature, oxygen atmosphere, catalyst, and humidity were three essential conditions for the growth of FGLNAs.


The surface condition effect of Cu2O flower/grass-like nanoarchitectures grown on Cu foil and Cu film.

Hu L, Ju Y, Hosoi A, Tang Y - Nanoscale Res Lett (2013)

SEM images of flower-like and grass-like architectures. Flower-like architectures grown on (a) unpolished Cu foil specimen, (b) Cu foil specimen polished using a 400-grit abrasive paper, and (c) Cu film specimen heated at 120°C for 2 h, respectively. Grass-like architectures on (d) unpolished Cu foil specimen, (e) Cu foil specimen polished using a 400-grit abrasive paper, and (f) Cu film specimen heated at 240°C for 2 h, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4231356&req=5

Figure 1: SEM images of flower-like and grass-like architectures. Flower-like architectures grown on (a) unpolished Cu foil specimen, (b) Cu foil specimen polished using a 400-grit abrasive paper, and (c) Cu film specimen heated at 120°C for 2 h, respectively. Grass-like architectures on (d) unpolished Cu foil specimen, (e) Cu foil specimen polished using a 400-grit abrasive paper, and (f) Cu film specimen heated at 240°C for 2 h, respectively.
Mentions: As shown in Figure 1, the FGLNAs grow on the unpolished Cu foil, polished Cu foil, and Cu film substrates after heating at 120°C and 240°C for 2 h. The size of FGLNAs is 3.5 to 12 μm, and the width of their petals is 50 to 950 nm. A heating temperature of 120°C leads to generate flower-like architectures and 240°C leads to generate grass-like architectures. The different heating temperatures induce different stress migration and oxidation speeds, thereby leading to different structures of FGLNAs. It has been confirmed experimentally that there was no FGLNA growth when the experimental conditions were changed to vacuum environment, without catalyst or under the humidity lower than 55% or higher than 75%, respectively. Therefore, it is thought that besides temperature, oxygen atmosphere, catalyst, and humidity were three essential conditions for the growth of FGLNAs.

Bottom Line: The FGLNAs are approximately 3.5 to 12 μm in size, and their petals are approximately 50 to 950 nm in width.The high compressive stress caused by a large oxide volume in the Cu2O layer on the specimen surface played an important role in the growth of FGLNAs.PACS: 81.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. ju@mech.Nagoya-u.ac.jp.

ABSTRACT
Cu2O flower/grass-like nanoarchitectures (FGLNAs) were fabricated directly on two category specimens of Cu foils and Cu film using thermal oxidation method. The FGLNAs are approximately 3.5 to 12 μm in size, and their petals are approximately 50 to 950 nm in width. The high compressive stress caused by a large oxide volume in the Cu2O layer on the specimen surface played an important role in the growth of FGLNAs. The effects of surface conditions, such as the surface stresses, grain size, and surface roughness of Cu foil and Cu film specimens, on the FGLNA growth were discussed in detail. PACS: 81. Materials science; 81.07.-b Nanoscale materials and structures: fabrication and characterization; 81.16.Hc Catalytic methods.

No MeSH data available.


Related in: MedlinePlus