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Room-temperature nonequilibrium growth of controllable ZnO nanorod arrays.

Li Q, Cheng K, Weng W, Song C, Du P, Shen G, Han G - Nanoscale Res Lett (2011)

Bottom Line: In this study, controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature (approx. 25°C).It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length.Moreover, its field emission property was also optimized by changing the nanorods density and dimension.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science & Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China. wengwj@zju.edu.cn.

ABSTRACT
In this study, controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature (approx. 25°C). The formation of controllable ZnO nanorod arrays has been investigated using growth media with different concentrations and molar ratios of Zn(NO3)2 to NaOH. Under such a nonequilibrium growth condition, the density and dimension of ZnO nanorod arrays were successfully adjusted through controlling the supersaturation degree, i.e., volume of growth medium. It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length. Moreover, its field emission property was also optimized by changing the nanorods density and dimension.

No MeSH data available.


Related in: MedlinePlus

SEM images of ZnO nanostructures grown by using different molar ratios of Zn2+ to OH-: (a) 1:4; (b) 1:6; (c) 1:8; (d) 1:10.
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Figure 1: SEM images of ZnO nanostructures grown by using different molar ratios of Zn2+ to OH-: (a) 1:4; (b) 1:6; (c) 1:8; (d) 1:10.

Mentions: There were several parameters affecting the growth characteristics of ZnO nanorod arrays, such as molar ratio of Zn2+ to OH-, zinc ion concentration, and volume of the growth medium (absolute quantity of zinc ion). Figure 1 shows the SEM pictures of samples D1, D2, C, and D3, which reveal the effects of different R ratios on nanorods morphology. When R was high (1:4 and 1:6), nanosheets formed (Figure 1a,b). It is noteworthy that small tips appear on the edge of nanosheets when R is 1:6. It is considered that these tips show the transformation of nanostructure from nanosheet to nanorod. When R decreased to 1:8, uniform ZnO nanorods with sharp tips formed (Figure 1c). Further decreasing R to 1:10 led to the formation of wider nanorods (Figure 1d).


Room-temperature nonequilibrium growth of controllable ZnO nanorod arrays.

Li Q, Cheng K, Weng W, Song C, Du P, Shen G, Han G - Nanoscale Res Lett (2011)

SEM images of ZnO nanostructures grown by using different molar ratios of Zn2+ to OH-: (a) 1:4; (b) 1:6; (c) 1:8; (d) 1:10.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211990&req=5

Figure 1: SEM images of ZnO nanostructures grown by using different molar ratios of Zn2+ to OH-: (a) 1:4; (b) 1:6; (c) 1:8; (d) 1:10.
Mentions: There were several parameters affecting the growth characteristics of ZnO nanorod arrays, such as molar ratio of Zn2+ to OH-, zinc ion concentration, and volume of the growth medium (absolute quantity of zinc ion). Figure 1 shows the SEM pictures of samples D1, D2, C, and D3, which reveal the effects of different R ratios on nanorods morphology. When R was high (1:4 and 1:6), nanosheets formed (Figure 1a,b). It is noteworthy that small tips appear on the edge of nanosheets when R is 1:6. It is considered that these tips show the transformation of nanostructure from nanosheet to nanorod. When R decreased to 1:8, uniform ZnO nanorods with sharp tips formed (Figure 1c). Further decreasing R to 1:10 led to the formation of wider nanorods (Figure 1d).

Bottom Line: In this study, controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature (approx. 25°C).It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length.Moreover, its field emission property was also optimized by changing the nanorods density and dimension.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science & Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China. wengwj@zju.edu.cn.

ABSTRACT
In this study, controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature (approx. 25°C). The formation of controllable ZnO nanorod arrays has been investigated using growth media with different concentrations and molar ratios of Zn(NO3)2 to NaOH. Under such a nonequilibrium growth condition, the density and dimension of ZnO nanorod arrays were successfully adjusted through controlling the supersaturation degree, i.e., volume of growth medium. It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length. Moreover, its field emission property was also optimized by changing the nanorods density and dimension.

No MeSH data available.


Related in: MedlinePlus