Morphology-controlled synthesis and field-emission properties of patterned SnO2 nanostructures with different morphologies

作者：Ma, L. A.^*; Wei, Z. H.; Ye, X. Y.; Lin, J. Y.; Hu, L. Q.; Guo, T. L.

来源：Ceramics International, 2017, 43(8): 6096-6104.

DOI：10.1016/j.ceramint.2017.02.002

• Tin oxide
• Thermal evaporation
• Field emission

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 SnO2 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 SnO2 nanostructures with manifold morphologies. Field-emission (FE) studies revealed that the morphologies of these patterned SnO2 nanostructures had considerable effects on the FE properties. Among these nanostructures, ultra-long nanowire arrays had the lowest turn-on field (similar to 0.47 V/um) and the highest field enhancement factor (similar to 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 (similar to 12000).

• 出版日期2017-6-1
• 单位福建工程学院; 福州大学