Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 26, Pages 13063-13068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp202359g
Keywords
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Funding
- Program of Science and Technology Innovation for Undergraduates in Zhejiang Province [2009R422018]
- Zhejiang Provincial Science Foundation for Distinguished Young Scholars [R4100242]
- Zhejiang Provincial Nature Science Foundation [Y4110529]
- National Natural Science Foundation of China (NSFC) [50872058, 50572083]
- Ningbo Municipal Government [2008B10044]
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In this work, we report the temperature-dependent field emission properties of 3C-SiC nanoneedles (SiCNNs) in the range of room temperature (RT) to 500 degrees C. SiCNNs are synthesized via catalyst-assisted pyrolysis of a poly-aluminasilazane precursor. The obtained SiC nanostructures are needlelike shaped with numerous sharp corners around the tiny tips. Field emission characteristics show that turn-on field (E-to) of as-synthesized SiCNNs are ranged in 1.30 to 0.66 V/mu m with the temperature raised from RT to 500 degrees C. At a fixed electric field of 1.37 V/mu m, about a three-order-of-magnitude increase of the emission current level has been observed. We attribute the significant reduction of E-to and the remarkable increase of emission current to the decrease of work function induced by the raise of temperatures.
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