Improvement of carbon nanotube field emission properties by ultrasonic nanowelding

Zhao, Bo; Yadian, Boluo; Chen, Da; Xu, D.; Zhang, Yafei

doi:10.1016/j.apsusc.2008.06.185

Cited by 14 publications

(5 citation statements)

References 18 publications

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“…The turn-on field is defined as the field that required to acquire an emission current density of 10 A cm −2 . [22][23][24] Figure 7 shows the current density-electric field ͑J-E͒ curves of the MWNTs thin film samples. It can be observed that the turn-on field of the MWNTs thin film sample was ϳ2.34 V m −1 .…”

Section: Fe Resultsmentioning

confidence: 99%

Enhanced field emission of vertically aligned core-shelled carbon nanotubes with molybdenum oxide encapsulation

Sow

Wee

et al. 2009

Journal of Applied Physics

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The field emission characteristics of the core-shelled nanostructures obtained by directly coating molybdenum oxide onto vertically aligned multiwalled carbon nanotubes (MWNTs) was investigated. A metal-organic chemical vapor deposition technique was used with Mo(CO)6 as the precursor and films deposited at process temperatures of 200, 400, and 700 °C. X-ray photoelectron spectroscopy, scanning electron microscopy, and x-ray diffraction were used to study and understand the material properties of the deposited coatings. Enhanced field emission performance was observed for molybdenum oxide coated MWNT samples at 400 °C with a turn-on field of 1.33 V μm−1 and a field enhancement factor β estimated to be ∼7000. The enhanced performance may be due to both the shape of the coated emitters and a decrease in the effective barrier height.

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Section: Fe Resultsmentioning

confidence: 99%

Enhanced field emission of vertically aligned core-shelled carbon nanotubes with molybdenum oxide encapsulation

Sow

Wee

et al. 2009

Journal of Applied Physics

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“…Metal nanostructures 6–10 were welded together through mechanical contact, 6 semiconductor nanostructures 11 were welded under a temperature below the melting point, and ceramic nanostructures 12 were welded through electron irradiation. The other nanowelding methods found include sintering, 7 ultrasonic welding, 13 resistance welding, 8 light welding, 9 and laser beam. 10 These methods are normally designed to make thousands of joints simultaneously in the case of heating, but are hardly controllable to weld or join two nanostructures just at one specifically targeted location at room temperature, while leaving the other parts intact.…”

Section: Introductionmentioning

confidence: 99%

Electron beam-induced athermal nanowelding of crossing SiO_x amorphous nanowires

Zheng

Cheng

et al. 2022

RSC Adv.

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“…12 Researchers also proposed that by using a rapid and simple ultrasonic nanowelding technique, reliable mechanical and electrical contact of SWNTsmetallic electrodes and MWNTs-Ti substrate could be formed. [13][14][15][16] The contact was improved, and turn-on field decreased from 4.9 to 3.4 V/ m. 16 In addition, the effects of nanowelding amplitude on CNT films were studied. 17 In our previous work, spot ultrasonic nanowelding was used to weld SWNTs on Al substrate and the turn-on field of welded cathode decreased to 0.9 V/ m. 18 Here, we report that nanowelding is an effective method to improve the contact between CNTs and substrate.…”

Section: Introductionmentioning

confidence: 99%

Research on Interface Structure During Nanowelding with Molecular Dynamics and Experimental Method

Liu¹,

Wang²,

Yu³

et al. 2016

j nanosci nanotechnol

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The mechanism of nanowelding between single-walled carbon nanotubes (SWNTs) and Ni substrate was investigated by molecular dynamics (MD) and experimental method. The horizontal oriented nanowelding system composed of metal electrode and SWNT subsystem was built for simulation study. The dynamic process of nanowelding was described completely at atomistic length scales, and the evolution of welding interface structure under different temperature and time was revealed by MD method. Simulation results showed nanowelding could be accomplished at a temperature (1500 K) below the melting point of Ni (1726 K). The mechanism responsible for nanowelding was revealed as the result of the high-frequency ultrasonic energy softening the metal and causing plastic deformation of the metal under the clamping stress because of the 'acoustic softening effect.' Based on simulation results, reliable contact between SWNTs and Ni substrate was built under proper nanowelding parameters by experiments. SWNTs were deposited on Ni substrate by electrophoretic deposition. The samples of sedimentary SWNT films were applied to ultrasonic nanowelding. Scanning electron microscopy results proved that SWNTs were embedded into the Ni metal layer and acted as stable filed emitter. The welded cathode exhibited enhanced field emission properties. The turn-on field of welded cathode decreased from 5.2 to 2.1 V/ m. By using nanowelding technique, high efficiency of preparing SWNT cathode is achieved and the progress in manufacturing large-scale of SWNT cathode is accelerated.

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Improvement of carbon nanotube field emission properties by ultrasonic nanowelding

Cited by 14 publications

References 18 publications

Enhanced field emission of vertically aligned core-shelled carbon nanotubes with molybdenum oxide encapsulation

Enhanced field emission of vertically aligned core-shelled carbon nanotubes with molybdenum oxide encapsulation

Electron beam-induced athermal nanowelding of crossing SiO_x amorphous nanowires

Research on Interface Structure During Nanowelding with Molecular Dynamics and Experimental Method

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Improvement of carbon nanotube field emission properties by ultrasonic nanowelding

Cited by 14 publications

References 18 publications

Enhanced field emission of vertically aligned core-shelled carbon nanotubes with molybdenum oxide encapsulation

Enhanced field emission of vertically aligned core-shelled carbon nanotubes with molybdenum oxide encapsulation

Electron beam-induced athermal nanowelding of crossing SiOx amorphous nanowires

Research on Interface Structure During Nanowelding with Molecular Dynamics and Experimental Method

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Electron beam-induced athermal nanowelding of crossing SiO_x amorphous nanowires