Morphology-controlled synthesis and field-emission properties of patterned SnO 2 nanostructures with different morphologies

Autor: L.Q. Hu, L.A. Ma, Tailiang Guo, Xiaoyun Ye, Z.H. Wei, Jin Yang Lin
Rok vydání: 2017
Předmět:
Zdroj: Ceramics International. 43:6096-6104
ISSN: 0272-8842
DOI: 10.1016/j.ceramint.2017.02.002
Popis: Tin oxide nanostructured arrays with different morphologies were grown on stainless-steel mesh substrates by a simple thermal evaporation process. It was found that the SnO 2 nanostructures could be easily changed from nanobelts to nanocones, nanoneedles, micro-rods, ultra-long nanowires, and slim nanorods by controlling the parameters of growth temperature and N 2 /O 2 flow. A model combining vapor-liquid-solid (VLS)-base growth and vapor-solid (VS)-tip growth was proposed to explain the growth of SnO 2 nanostructures with manifold morphologies. Field-emission (FE) studies revealed that the morphologies of these patterned SnO 2 nanostructures had considerable effects on the FE properties. Among these nanostructures, ultra-long nanowire arrays had the lowest turn-on field (~0.47 V/um) and the highest field enhancement factor (~8848). More importantly, the ultra-long nanowire emitters showed excellent FE stability with fluctuations within 2.7%. The enhanced FE properties may be attributed to synergic effects arising from the aligned structures of the ultra-long nanowire emitters, their smaller areal density and their highest aspect ratio (~12000).
Databáze: OpenAIRE
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