Field emission properties of crystalline-SnO2 (core)/amorphous-SnO2 (shell) nanowire arrays on carbon paper

•The c-SnO2 (core)/a-SnO2 (shell) nanowire cathodes were prepared.•The effects of the a-SnO2 on the morphology and FE properties of the c-SnO2 were investigated.•Low turn-on field of 0.95 V/μm with a high β of 6817 was achieved. The amorphous-SnO2 (a-SnO2) thin films with different thickness were de...

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Bibliographic Details
Published in:Materials letters 2018-02, Vol.213, p.257-261
Main Authors: Ma, L.A., Wei, Z.H.
Format: Article
Language:English
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Summary:•The c-SnO2 (core)/a-SnO2 (shell) nanowire cathodes were prepared.•The effects of the a-SnO2 on the morphology and FE properties of the c-SnO2 were investigated.•Low turn-on field of 0.95 V/μm with a high β of 6817 was achieved. The amorphous-SnO2 (a-SnO2) thin films with different thickness were deposited on well-aligned single crystal SnO2 (c-SnO2) nanowire arrays by magnetron sputtering technology. The effects of the a-SnO2 on the morphology and field-emission (FE) properties of the c-SnO2 were investigated. The results show that the turn-on field of the nanowire increases with increasing a-SnO2 coating thickness. The c-SnO2 emitters with a-SnO2 sputtering at 10 s showed a lowest turn-on field of 0.95 V μm−1 at a current density of 10 μA cm−2 and a highest emission current density of 2.44 mA cm−2 under the field of only 1.56 V μm−1. The enhanced FE property is due to the thin a-SnO2 film in situ formed nanoparticles on the nanowire backbone, which could perform the role of tip in the surface of the nanowires and bring a significantly increased density of the electron emission sites.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.11.095