Enhanced Field Emission of Single-Wall Carbon Nanotube Cathode Prepared by Screen Printing with a Silver Paste Buffer Layer

Jiang, Ruirui; Liu, Jianlong; Yang, Kaiqiang; Zhao, Jing; Zhang, Baoqing

doi:10.3390/nano12010165

Cited by 7 publications

(4 citation statements)

References 32 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum anode current was 40 mA at a gate voltage of 2.3 kV, corresponding to the maximum anode current density of 95.2 A/cm 2 . The obtained emission properties are much higher than those of other CNT paste field emitters [32]- [39]. As mentioned in the field emission characteristics of the diode configuration, both the high emission current and the high emission current density are attributed to the high density of emission sites at the edge of the CNT film.…”

Section: Methodsmentioning

confidence: 82%

“…The CNT field emitter using a free-standing CNT film exhibited a very high emission current density of 100 A/cm 2 . On the other hand, CNT field emitters made by as-grown CNTs showed a low current density below 30 mA/cm 2 [10], [11], [40], [41] and the CNT field emitters made by CNT paste showed a current density below 10 A/cm 2 [16], [19], [28], [29], [32]- [39]. For cold cathode X-ray sources, it is necessary for CNT field emitters to have both the high emission current and the high emission current density.…”

Section: (A) and (C)mentioning

confidence: 99%

See 1 more Smart Citation

High-Performance Field Electron Emitters Fabricated Using a Free-Standing Carbon Nanotube Film

Han

Lee

2022

IEEE J. Electron Devices Soc.

View full text Add to dashboard Cite

The carbon nanotube (CNT) field emitter was fabricated using a thin free-standing CNT film, indicating a lineshape CNT field emitter. Field emission properties of the CNT field emitter were investigated in both diode and triode configurations. The CNT field emitter showed a low turn-on electric field of 1.8 V/µm and a high emission current of 40.3 mA, corresponding to the emission current density of 96 A/cm 2 in the diode configuration. It also exhibited a high anode current of 40 mA, corresponding to the anode current density of 95.2 A/cm 2 in the triode configuration. In addition, the CNT field emitter showed a good electron beam transmittance of 86.4% and excellent emission stability without degradation for 15 h. The main reason for the high performance of our CNT field emitter is caused by the high density of emission sites at the edge of the CNT film.

show abstract

Section: Methodsmentioning

confidence: 82%

Section: (A) and (C)mentioning

confidence: 99%

High-Performance Field Electron Emitters Fabricated Using a Free-Standing Carbon Nanotube Film

Han

Lee

2022

IEEE J. Electron Devices Soc.

View full text Add to dashboard Cite

show abstract

“…To further enhance the stability of the cathode, a silver buffer layer was applied between the silicon substrate and the MLG film using the screen-printing method. This silver layer can not only strengthen the adhesion between MLG and the substrate but also reduce the contact resistance between them, facilitating electron transport and minimizing Joule heating [31].…”

Section: Field Emission Performance Of Screen-printed Cathodes With S...mentioning

confidence: 99%

A Study on the Field Emission Characteristics of High-Quality Wrinkled Multilayer Graphene Cathodes

Lv,

Wang,

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Field emission (FE) necessitates cathode materials with low work function and high thermal and electrical conductivity and stability. To meet these requirements, we developed FE cathodes based on high-quality wrinkled multilayer graphene (MLG) prepared using the bubble-assisted chemical vapor deposition (B-CVD) method and investigated their emission characteristics. The result showed that MLG cathodes prepared using the spin-coating method exhibited a high field emission current density (~7.9 mA/cm2), indicating the excellent intrinsic emission performance of the MLG. However, the weak adhesion between the MLG and the substrate led to the poor stability of the cathode. Screen printing was employed to prepare the cathode to improve stability, and the influence of a silver buffer layer was explored on the cathode’s performance. The results demonstrated that these cathodes exhibited better emission stability, and the silver buffer layer further enhanced the comprehensive field emission performance. The optimized cathode possesses low turn-on field strength (~1.5 V/μm), low threshold field strength (~2.65 V/μm), high current density (~10.5 mA/cm2), and good emission uniformity. Moreover, the cathode also exhibits excellent emission stability, with a current fluctuation of only 6.28% during a 4-h test at 1530 V.

show abstract

“…A buffer layer is often used to reduce the contact resistance between the CNTs and substrate. The material of such a layer can be made of metals, for example, silver [88]. Materials such as Ti, TiN, W, and Mo are often used as a sublayer, and Ni, Co, and Fe-as catalysts for the CNT synthesis.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Carbon Nanotubes–Graphene Nanostructures: Modeling, Formation, Characterization

et al. 2022

View full text Add to dashboard Cite

A technology for the formation and bonding with a substrate of hybrid carbon nanostructures from single-walled carbon nanotubes (SWCNT) and reduced graphene oxide (rGO) by laser radiation is proposed. Molecular dynamics modeling by the real-time time-dependent density functional tight-binding (TD-DFTB) method made it possible to reveal the mechanism of field emission centers formation in carbon nanostructures layers. Laser radiation stimulates the formation of graphene-nanotube covalent contacts and also induces a dipole moment of hybrid nanostructures, which ensures their orientation along the force lines of the radiation field. The main mechanical and emission characteristics of the formed hybrid nanostructures were determined. By Raman spectroscopy, the effect of laser radiation energy on the defectiveness of all types of layers formed from nanostructures was determined. Laser exposure increased the hardness of all samples more than twice. Maximum hardness was obtained for hybrid nanostructure with a buffer layer (bl) of rGO and the main layer of SWCNT—rGO(bl)-SWCNT and was 54.4 GPa. In addition, the adhesion of rGO to the substrate and electron transport between the substrate and rGO(bl)-SWCNT increased. The rGO(bl)-SWCNT cathode with an area of ~1 mm2 showed a field emission current density of 562 mA/cm2 and stability for 9 h at a current of 1 mA. The developed technology for the formation of hybrid nanostructures can be used both to create high-performance and stable field emission cathodes and in other applications where nanomaterials coating with good adhesion, strength, and electrical conductivity is required.

show abstract

Enhanced Field Emission of Single-Wall Carbon Nanotube Cathode Prepared by Screen Printing with a Silver Paste Buffer Layer

Cited by 7 publications

References 32 publications

High-Performance Field Electron Emitters Fabricated Using a Free-Standing Carbon Nanotube Film

High-Performance Field Electron Emitters Fabricated Using a Free-Standing Carbon Nanotube Film

A Study on the Field Emission Characteristics of High-Quality Wrinkled Multilayer Graphene Cathodes

Hybrid Carbon Nanotubes–Graphene Nanostructures: Modeling, Formation, Characterization

Contact Info

Product

Resources

About