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Journal of Nanoparticle Research

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01-01-2011 | Research Paper

Field-emission enhancement of molybdenum oxide nanowires with nanoprotrusions

Authors: Ali Khademi, Rouhollah Azimirad, Yung-Tang Nien, Alireza Z. Moshfegh

Published in: Journal of Nanoparticle Research | Issue 1/2011

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Abstract

The field-emission properties of molybdenum oxide nanowires grown on a silicon substrate and its emission performance in various vacuum gaps are reported in this article. A new kind of molybdenum oxides named nanowires with nanoscale protrusions on their surfaces were grown by thermal vapor deposition with a length of ~1 μm and an average diameter of ~50 nm. The morphology, structure, composition and chemical states of the prepared nanostructures were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). According to XRD, XPS, and TEM analyses, the synthesized samples were composed of MoO₂ nanowires formed over a thin layer of crystalline Mo₄O₁₁. TEM observation revealed that these nanowires have some nanoscale protrusion on their surface. These nanoprotrusions resulted in enhancement of field-emission properties of nanowires comprising nanoprotrusions. The turn-on emission field and the enhancement factor of this type of nanostructures were measured 0.2 V/μm and 42991 at the vacuum gap of 300 μm, respectively. These excellent emission properties are attributed to the special structure of the nanowires that have potential for utilizing in vacuum nanoelectronic and microelectronic applications.

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Title: Field-emission enhancement of molybdenum oxide nanowires with nanoprotrusions
Authors: Ali Khademi
Rouhollah Azimirad
Yung-Tang Nien
Alireza Z. Moshfegh
Publication date: 01-01-2011
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 1/2011
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-010-0009-0

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