Field emission from hydrogen titanate nanotubes

Hydrothermally synthesized hydrogen titanate (H 2 Ti 3 O 7 ) nanotube meshes and arrays exhibit excellent field emission characteristics. The turn-on field is as low as 1.4V μ m −1 for the mesh and 2.6V μ m −1 for the array, while the electric field corresponding to an emission current density of 10...

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Bibliographic Details
Published in:Applied physics letters 2011-10, Vol.99 (14), p.143106-143106-3
Main Authors: Chakraborty, Indrani, Chatterjee, Sriparna, Ayyub, Pushan
Format: Article
Language:English
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Summary:Hydrothermally synthesized hydrogen titanate (H 2 Ti 3 O 7 ) nanotube meshes and arrays exhibit excellent field emission characteristics. The turn-on field is as low as 1.4V μ m −1 for the mesh and 2.6V μ m −1 for the array, while the electric field corresponding to an emission current density of 10 μ A cm −2 is 2V μ m −1 (mesh) and 3.8V μ m −1 (array). The H 2 Ti 3 O 7 nanotube mesh has one of the lowest reported turn-on voltages and highest enhancement factors. The emission current also shows good long term stability. We attribute the efficient field emission to the presence of mid-gap states arising from the negative surface charge on the H 2 Ti 3 O 7 nanotubes.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3646401