期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 19, 页码 9740-9745出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp200398s
关键词
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资金
- National High Technology Research and Development Program of China [2007AA03Z301]
- Natural Science Foundations of China [61076040, 20771032, 60806028]
- National Basic Research Program of China [2007CB9-36001]
- World Premier International Research Center (WPI) initiative on Materials Nanoarchitectonics (MANA), MEXT, Japan
- China Scholarship Council [CSC-2008669013]
Ordered CdSe nanowire branched arrays were designed and synthesized while merging two particular structural features within a single nanomaterial. This novel CdSe nanostructure combines a branched structure and ordered single-crystalline character. The stems and branches consist of wurtzite CdSe single crystals. When measuring field-emission properties, the CdSe novel nanostructure demonstrated a low turn-on field at 4.3 +/- 0.2 V mu m(-1) for the current densities of 10 mu A cm(-2), high field-enhancement factor (1160 +/- 50), and long emission stability. It indicates that the CdSe novel nanostructure could potentially be used as field emitters. The excellent field-emission performance is due to the unique morphology of CdSe, e.g., high structural order, branched structure, perfect single-crystallinity, and tapered nanotips. In addition, red lasing, in a range 700-720 nm, of the ordered CdSe nanowire branched arrays were demonstrated. The nature of the observed lasing emission accords with coherent random lasing behavior. A lower lasing threshold was achieved due to the homoepitaxial growth of CdSe nanowire branches on the CdSe microrods stems as well.
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