Highly enhanced field emission from copper oxide nanoparticle decorated vertically aligned carbon nanotubes: Role of interfacial electronic structure

Sreekanth, M.; Srivastava, Pankaj; Ghosh, Santanu

doi:10.1016/j.apsusc.2019.145215

Cited by 27 publications

(1 citation statement)

References 62 publications

(60 reference statements)

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“…The preparation of the x-ray source by a cold cathode [2, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] based on field-induced electron emission has become a promising trend. In particular, combined with micro-nano processing technology, it is possible to achieve linear array or even area array x-ray source based on the integration of pixelated cold-cathode-based x-ray source.…”

Section: Introductionmentioning

confidence: 99%

High-performance x-ray source based on graphene oxide-coated Cu₂S nanowires grown on copper film

Zhang¹,

Zhang²,

He³

et al. 2020

Nanotechnology

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Full static x-ray computed tomography (CT) technology has enabled higher precision and resolution imaging and has been applied in many applications such as diagnostic medical imaging, industrial inspection and security screening. In this technique, the x-ray source section is mainly composed of a thermionic cathode and electron beam scanning system. However, they have several shortcomings such as limited scanning angle, long response time and large volume. Distributed and programmable cold cathode (i.e. carbon nanotubes, ZnO nanowires (NWs)) field-emission x-ray sources are expected to solve these problems. However, there have been several long-standing challenges to the application of such cold field emitters for x-ray sources, such as the short lifetime and rigorous fabrication process, which have fundamentally prevented their widespread use. Here, we propose and demonstrate a cold field-emission x-ray source based on a graphene oxide (GO)-coated cuprous sulfide nanowire (Cu2S NW/GO) cathode. The proposed Cu2S NW/GO x-ray source provides stable emission (>18 h at a direct voltage of 2600 V) and has a low threshold (4.5 MV m−1 for obtaining a current density of 1 μA cm−2), benefiting from the demonstrated key features such as in situ epitaxy growth of Cu2S NWs on Cu, nanometer-scale sharp protrusions within GO and charge transfer between the Cu2S NWs and GO layer. Our research provides a simple and robust method to obtain a high-performance cold field emitter, leading to great potential for the next generation of x-ray source and CT.

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Section: Introductionmentioning

confidence: 99%

High-performance x-ray source based on graphene oxide-coated Cu₂S nanowires grown on copper film

Zhang¹,

Zhang²,

He³

et al. 2020

Nanotechnology

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Unraveling the Augmented Field Emission Performance of Molybdenum Disulfide‐Praseodymium Sulfide (MoS₂@PrS) Heterostructure: A Combined Experimental and First Principles‐Based Study

Mahajan,

Khan,

Umapathy

et al. 2024

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The molybdenum disulfide‐praseodymium sulfide (MoS2‐PrS) heterojunctions are optimally synthesized through a sophisticated three‐step procedure. Initially, MoS2 rods are synthesized using the micellar route followed by a solid‐state reaction, forming well‐defined structures. Subsequently, PrS nanoparticles are synthesized using the same method. In the final stage, PrS nanoparticles are evenly self‐assembled onto the MoS2 rods to create MoS2‐PrS heterojunctions. This is accomplished using a combination of polyethylene glycol and ethanol as a cohesive substance, assisted by the spin coating process. The MoS2‐PrS heterostructure has exceptional field emission characteristics, with a much lower turn‐on field of 2.6 V µm−1. This is in sharp contrast to the turn‐on fields of 3.5 and 4.3 V µm−1 reported in pure MoS2 and PrS, respectively. The emission current demonstrates remarkable stability at a predetermined value of 6 V µm−1 across 8 h, with variations limited to within ±2% of the mean value. The improved field emission (FE) capability of the MoS2‐PrS heterostructure is attributed to its high enhancement factor (β) of 2.1 × 103. The results highlight the capability of the MoS2‐PrS heterostructure emitter as a promising electron source in vacuum nano/microelectronic systems. Density functional theory calculation on electronic structure is performed to support the experimental results.

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Field Emission from Carbon Nanotube Systems: Material Properties to Device Applications

Sreekanth

Ghosh

Srivastava

2022

Handbook of Carbon Nanotubes

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Highly enhanced field emission from copper oxide nanoparticle decorated vertically aligned carbon nanotubes: Role of interfacial electronic structure

Cited by 27 publications

References 62 publications

High-performance x-ray source based on graphene oxide-coated Cu₂S nanowires grown on copper film

High-performance x-ray source based on graphene oxide-coated Cu₂S nanowires grown on copper film

Unraveling the Augmented Field Emission Performance of Molybdenum Disulfide‐Praseodymium Sulfide (MoS₂@PrS) Heterostructure: A Combined Experimental and First Principles‐Based Study

Field Emission from Carbon Nanotube Systems: Material Properties to Device Applications

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Highly enhanced field emission from copper oxide nanoparticle decorated vertically aligned carbon nanotubes: Role of interfacial electronic structure

Cited by 27 publications

References 62 publications

High-performance x-ray source based on graphene oxide-coated Cu2S nanowires grown on copper film

High-performance x-ray source based on graphene oxide-coated Cu2S nanowires grown on copper film

Unraveling the Augmented Field Emission Performance of Molybdenum Disulfide‐Praseodymium Sulfide (MoS2@PrS) Heterostructure: A Combined Experimental and First Principles‐Based Study

Field Emission from Carbon Nanotube Systems: Material Properties to Device Applications

Contact Info

Product

Resources

About

High-performance x-ray source based on graphene oxide-coated Cu₂S nanowires grown on copper film

High-performance x-ray source based on graphene oxide-coated Cu₂S nanowires grown on copper film

Unraveling the Augmented Field Emission Performance of Molybdenum Disulfide‐Praseodymium Sulfide (MoS₂@PrS) Heterostructure: A Combined Experimental and First Principles‐Based Study