Field emission enhancement from directly grown N-doped carbon nanotubes on stainless steel substrates

Huang, Weijun; Qian, Weijin; Luo, Haijun; Dong, Mingliang; Shao, Hezhu; Chen, Yawei; Liu, Xing Zhen; Dong, Changkun

doi:10.1016/j.vacuum.2022.110900

Cited by 16 publications

(4 citation statements)

References 49 publications

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“…The main reason for this observation may be the limited transmission of the grid electrode (about 73%) in our triode-type FE measurement setup leading to charge accumulation in the emitter-grid gap, possibly shielding the CNT surface from the electric field [51]. Furthermore, a lower ferrocene content could be tested in the future to decrease the threshold field [48] or nitrogen doping to reduce the CNTs' effective work function [52].…”

Section: Field Emission From Cnts On Planar Substratesmentioning

confidence: 99%

Field Emission from Carbon Nanotubes on Titanium Nitride-Coated Planar and 3D-Printed Substrates

Haugg,

Mochalski,

Hedrich

et al. 2024

Nanomaterials

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Carbon nanotubes (CNTs) are well known for their outstanding field emission (FE) performance, facilitated by their unique combination of electrical, mechanical, and thermal properties. However, if the substrate of choice is a poor conductor, the electron supply towards the CNTs can be limited, restricting the FE current. Furthermore, ineffective heat dissipation can lead to emitter–substrate bond degradation, shortening the field emitters’ lifetime. Herein, temperature-stable titanium nitride (TiN) was deposited by plasma-enhanced atomic layer deposition (PEALD) on different substrate types prior to the CNT growth. A turn-on field reduction of up to 59% was found for the emitters that were generated on TiN-coated bulk substrates instead of on pristine ones. This observation was attributed exclusively to the TiN layer as no significant change in the emitter morphology could be identified. The fabrication route and, consequently, improved FE properties were transferred from bulk substrates to free-standing, electrically insulating nanomembranes. Moreover, 3D-printed, polymeric microstructures were overcoated by atomic layer deposition (ALD) employing its high conformality. The results of our approach by combining ALD with CNT growth could assist the future fabrication of highly efficient field emitters on 3D scaffold structures regardless of the substrate material.

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Section: Field Emission From Cnts On Planar Substratesmentioning

confidence: 99%

Field Emission from Carbon Nanotubes on Titanium Nitride-Coated Planar and 3D-Printed Substrates

Haugg,

Mochalski,

Hedrich

et al. 2024

Nanomaterials

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“…In addition, the Fermi levels (EF) of all samples were calibrated with the value of 0 eV. Thus, the work functions could be calculated based on the following equation: φ = 21.22 − BE SEC [8,44], where φ is the work function of the material, and BE SEC is the binding energy of the secondary cutoff edge (SEC). Taking the undoped ZnO sample as an example (Figure 7a…”

Section: Field Emission Performance Testmentioning

confidence: 99%

Enhanced Field Emission and Low-Pressure Hydrogen Sensing Properties from Al–N-Co-Doped ZnO Nanorods

Tu,

Qian,

Dong

et al. 2024

Nanomaterials

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ZnO nanostructures show great potential in hydrogen sensing at atmospheric conditions for good gas adsorption abilities. However, there is less research on low-pressure hydrogen sensing performance due to its low concentration and in-homogeneous distributions under low-pressure environments. Here, we report the low-pressure hydrogen sensing by the construction of Al–N-co-doped ZnO nanorods based on the adsorption-induced field emission enhancement effect in the pressure range of 10−7 to 10−3 Pa. The investigation indicates that the Al–N-co-doped ZnO sample is the most sensitive to low-pressure hydrogen sensing among all ZnO samples, with the highest sensing current increase of 140% for 5 min emission. In addition, the increased amplitude of sensing current for the Al–N-co-doped ZnO sample could reach 75% at the pressure 7 × 10−3 Pa for 1 min emission. This work not only expands the hydrogen sensing applications to the co-doped ZnO nanomaterials, but also provides a promising approach to develop field emission cathodes with strong low-pressure hydrogen sensing effect.

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“…The conclusion of our study is different from pre-vious studies in that the effect of N doping on the field emission properties of graphene was only attributed to the reduction of the work function by the introduction of nitrogen without considering the effect of different N doping contents and/or types. [21][22][23][24] Instead, it is believed that the effect is related to the different changes in the work function and energy level caused by different contents and types of N doping. Our study provides insight into the specific tuneable effect of different N doping configurations on field emission properties.…”

Section: Introductionmentioning

confidence: 99%

Tuneable effects of pyrrolic N and pyridinic N on the enhanced field emission properties of nitrogen-doped graphene

Meng,

Zhan,

She

et al. 2023

Nanoscale

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Field emission enhancement from directly grown N-doped carbon nanotubes on stainless steel substrates

Cited by 16 publications

References 49 publications

Field Emission from Carbon Nanotubes on Titanium Nitride-Coated Planar and 3D-Printed Substrates

Field Emission from Carbon Nanotubes on Titanium Nitride-Coated Planar and 3D-Printed Substrates

Enhanced Field Emission and Low-Pressure Hydrogen Sensing Properties from Al–N-Co-Doped ZnO Nanorods

Tuneable effects of pyrrolic N and pyridinic N on the enhanced field emission properties of nitrogen-doped graphene

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