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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.


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Field emission properties of (a) sample A; (b) sample B; and (c) sample C.
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Figure 10: Field emission properties of (a) sample A; (b) sample B; and (c) sample C.

Mentions: It is well known that ZnO 1D nanostructures with different shapes, such as nanowires, nanorods, and nanotubes, have been observed to have better field emission properties than the traditional materials. Commonly, the excellent field emission performance of 1D ZnO nanorod array is believed to benefit from the geometrical configuration of sharp tips, optimized density, and large aspect ratio [4,30]. In this study, we investigated the field emission properties of ZnO nanorod arrays with sharp tips and with different density and dimension prepared on Si substrates. The measurements of field emission were carried out in a vacuum chamber at room temperature. The J-E characteristic curves of samples A-C are shown in Figure 10, which gives the field emission current density (J) of each sample on the average electric field (E) between the anode and the cathode. The results show that samples B and C have obvious and stable field emission properties, and no emission current was detected from sample A even the applied voltage reached nearly 2000 V. The turn-on voltage of samples B and C is about 3.0 and 2.4 V/μm corresponding to a current density of 1 μA/cm-2. It is obvious that sample C has the best field emission property with the lowest turn-on electric field and with the highest current density at the same applied electric field on samples. The better field emission performance sample C can be attributed to its high aspect ratio, which was acquired by increasing the medium volume in the present room temperature ZnO nanorods synthesis method.


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)

Field emission properties of (a) sample A; (b) sample B; and (c) sample C.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 10: Field emission properties of (a) sample A; (b) sample B; and (c) sample C.
Mentions: It is well known that ZnO 1D nanostructures with different shapes, such as nanowires, nanorods, and nanotubes, have been observed to have better field emission properties than the traditional materials. Commonly, the excellent field emission performance of 1D ZnO nanorod array is believed to benefit from the geometrical configuration of sharp tips, optimized density, and large aspect ratio [4,30]. In this study, we investigated the field emission properties of ZnO nanorod arrays with sharp tips and with different density and dimension prepared on Si substrates. The measurements of field emission were carried out in a vacuum chamber at room temperature. The J-E characteristic curves of samples A-C are shown in Figure 10, which gives the field emission current density (J) of each sample on the average electric field (E) between the anode and the cathode. The results show that samples B and C have obvious and stable field emission properties, and no emission current was detected from sample A even the applied voltage reached nearly 2000 V. The turn-on voltage of samples B and C is about 3.0 and 2.4 V/μm corresponding to a current density of 1 μA/cm-2. It is obvious that sample C has the best field emission property with the lowest turn-on electric field and with the highest current density at the same applied electric field on samples. The better field emission performance sample C can be attributed to its high aspect ratio, which was acquired by increasing the medium volume in the present room temperature ZnO nanorods synthesis method.

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