期刊
LANGMUIR
卷 26, 期 8, 页码 5527-5533出版社
AMER CHEMICAL SOC
DOI: 10.1021/la9037777
关键词
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资金
- JSPS [18560661]
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Grants-in-Aid for Scientific Research [18560661] Funding Source: KAKEN
Heterojunction structures of nanocrystalline materials are of great importance in scientific and industrial research for their potential applications in nanoscale electronics and photonics. Here, we report a simple wet-chemical method of nitrogen-mediated growth of ZnO nanocrystals on carbon nitride (CNx) nanotubes. SEM and TEM analyses show self-organized ZnO nanoflowers on CNx stems. PL spectra exhibiting a blue emission at 449 nm confirms the junction formation between CNx and ZnO The field emission (FE) properties of CNx-ZnO film are greatly improved over those of pristine CNx. The turn-on and threshold fields for bare CNx film are 1.70 and 2.95 V/mu m, whereas those for CNx-ZnO hybrid are found to be 0.75 and 1.3 V/mu m. respectively. This significant downshift in the turn-on and threshold fields is believed to occur via lowering of the Schottky barrier at the metal-semiconductor interface. Three-dimensionally blossomed ZnO nanopetals with multiple sharp tips effectively enhance the FE performance. Moreover, this heterojunction reinforces the electron emission lifetime and protects the CNx tubes against thermal degradation.
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