From Copper Nanocrystalline to CuO Nanoneedle Array: Synthesis, Growth Mechanism, and Properties
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- 作者：Yueli Liu ; Lei Liao ; Jinchai Li ; Chunxu Pan
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：April 5, 2007
- 年：2007
- 卷：111
- 期：13
- 页码：5050 - 5056
- 全文大小：1018K
- 年卷期：v.111,no.13(April 5, 2007)
- ISSN：1932-7455
文摘
In the present work, a novel method for synthesizing a one-dimensional CuO nanoneedle array was introduced;that is, first, a pure copper nanocrystalline layer was plated by using a periodic reverse pulse plating process,and then the CuO nanoneedle array grew upon the layer through thermal oxidation in the air. The nanocrystallinelayer and nanoneedles were characterized by using scanning electron microscopy, regular and high-resolutiontransmission electron microscopies, X-ray diffraction, X-ray photoelectron spectroscopy, and a thermal analysissystem (thermogravimetry and differential scanning calorimetry). The results showed that the oxidationtemperature and the Cu2O intermediate phase played key roles for growing CuO nanoneedles. A self-catalyzedbased-up diffusion model was proposed for interpreting the nanoneedles' growth mechanism. The field emissionproperty of the nanoneedles showed that the electron emission turn-on field is about 0.5 V 
m-1 at currentdensity 10 A cm-2, and the maximum current density is 2.5 mA cm-2 with a linear F-N relationship. Thefull Sun efficiency (
) of the CuO nanoneedle used as a cathode in dye-sensitized solar cells is 1.12%, whichshows it to be a potential material in solar cells.
m-1 at currentdensity 10 A cm-2, and the maximum current density is 2.5 mA cm-2 with a linear F-N relationship. Thefull Sun efficiency () of the CuO nanoneedle used as a cathode in dye-sensitized solar cells is 1.12%, whichshows it to be a potential material in solar cells.