Elsevier

Materials Letters

Volume 58, Issue 29, November 2004, Pages 3812-3815
Materials Letters

Enhanced field emission properties of MoO2 nanorods with controllable shape and orientation

https://doi.org/10.1016/j.matlet.2004.07.034Get rights and content

Abstract

Arrays of MoO2 nanorods were fabricated on silicon substrates within a typical growth time of ∼1 min by direct heating of a molybdenum spiral coil in a low vacuum. The nanorods grown with Au particles as catalyst have similar diameters but with sharper tips than that grown without catalyst, and exhibit a lower switch-on voltage for field emission. The orientation of the nanorods with sharper tips can be considerably improved by increasing the coil temperatures, thus leading to increased field emission currents. For example, the turn-on voltage of the nanorods decreases from ∼18 to ∼4 V/μm when the coil temperature goes up from ∼800 to ∼1000 °C. The present study provides a way to fabricate metal oxides nanorods on flat substrates as well as to modify their field emission performance.

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Acknowledgement

This study was supported by the NSF of China and in part by the Ministry of Education and Ministry of Science and Technology of China.

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