Needle-Shaped Single-Crystalline Molybdenum Micro-Nano Structure with High Conductivity and Excellent Field Emission Properties: Implications for Large-Current Cold-Cathodes
High-melting point metallic micro-nano structural materials are well recognized as good conductors and electron emitters, particularly in the field of cold-cathode electron source and vacuum electron device applications. Developing their single-crystalline structures helps to further obtain large-cu...
Saved in:
Published in | ACS applied nano materials Vol. 6; no. 13; pp. 12486 - 12496 |
---|---|
Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
14.07.2023
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | High-melting point metallic micro-nano structural materials are well recognized as good conductors and electron emitters, particularly in the field of cold-cathode electron source and vacuum electron device applications. Developing their single-crystalline structures helps to further obtain large-current and high-power output performance; however, the controllable preparation of materials is always a difficult problem. In this study, we successfully realized the controllable self-assembled growth of high-quality needle-shaped molybdenum (Mo) micro-nano structures, by developing a modified thermal vapor deposition method. The Mo needle typically exhibits ultralong quasi-one dimension (up to ∼1.5 mm) and a sharp tip-end, with a perfect single-crystalline nature. Based on this structural feature, a type of Mo individual with a continuous structure is demonstrated to show an excellent conductivity of approximately 5 × 105 Ω–1 cm–1 and very large field emission current up to 93.1 μA with a corresponding current density of 1.2 × 105 A cm–2, standing out from most of the reported cold-cathode nanomaterials. This study provides a potential cold-cathode material with high conductivity and large current for vacuum electronic applications and also indicates a feasible path to achieve the preparation of high-quality single crystals of high-melting-point metals. |
---|---|
ISSN: | 2574-0970 2574-0970 |
DOI: | 10.1021/acsanm.3c02241 |