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Flexible Field Emitter for X-ray Generation by Implanting CNTs into Nickel Foil.

Sun B, Wang Y, Ding G - Nanoscale Res Lett (2016)

Bottom Line: By embedding CNT roots into Ni foil using polymer matrix as transfer media, effective direct contact between Ni and CNTs was achieved.As a result, our novel emitter shows relatively good field emission properties such as low turn-on field and good stability.The gray shadow that appears on the sensitive film after being exposed to the radiation confirms the successful generation of X-ray.

View Article: PubMed Central - PubMed

Affiliation: National Key Laboratory of Micro/Nano Fabrication Technology, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.

ABSTRACT
This paper reports a novel implanting micromachining technology. By using this method, for the first time, we could implant nano-scale materials into milli-scale metal substrates at room temperature. Ni-based flexible carbon nanotube (CNT) field emitters were fabricated by the novel micromachining method. By embedding CNT roots into Ni foil using polymer matrix as transfer media, effective direct contact between Ni and CNTs was achieved. As a result, our novel emitter shows relatively good field emission properties such as low turn-on field and good stability. Moreover, the emitter was highly flexible with preservation of the field emission properties. The excellent field emission characteristics attributed to the direct contact and the strong interactions between CNTs and the substrate. To check the practical application of the novel emitter, a simple X-ray imaging system was set up by modifying a traditional tube. The gray shadow that appears on the sensitive film after being exposed to the radiation confirms the successful generation of X-ray.

No MeSH data available.


Emission stability of the fabricated emitters, operated in continuous DC mode
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Fig8: Emission stability of the fabricated emitters, operated in continuous DC mode

Mentions: As shown in Fig. 8, with the applied fields of 2.05, 2.30, 2.66, and 1.43 V/μm, emission currents of 58.9, 104.4, 204.2, and 310.5 μA could be achieved, they remained almost constant during the 40-h continuous measurement, and the fluctuation widths of the emission current for 40 h were all in ±5 %. One thing to note here is that a few arcing events occurred when the emission current reached higher than 300 μA; however, the emitter could withstand the arcing and the emission current remained constant with time. The stable emission performance was primarily due to the firm, direct bonding between CNTs and Ni substrate, which greatly reduces the contact resistance between CNTs and substrate and the damnification of CNTs escaping from the emitter surface.Fig. 8


Flexible Field Emitter for X-ray Generation by Implanting CNTs into Nickel Foil.

Sun B, Wang Y, Ding G - Nanoscale Res Lett (2016)

Emission stability of the fabricated emitters, operated in continuous DC mode
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940312&req=5

Fig8: Emission stability of the fabricated emitters, operated in continuous DC mode
Mentions: As shown in Fig. 8, with the applied fields of 2.05, 2.30, 2.66, and 1.43 V/μm, emission currents of 58.9, 104.4, 204.2, and 310.5 μA could be achieved, they remained almost constant during the 40-h continuous measurement, and the fluctuation widths of the emission current for 40 h were all in ±5 %. One thing to note here is that a few arcing events occurred when the emission current reached higher than 300 μA; however, the emitter could withstand the arcing and the emission current remained constant with time. The stable emission performance was primarily due to the firm, direct bonding between CNTs and Ni substrate, which greatly reduces the contact resistance between CNTs and substrate and the damnification of CNTs escaping from the emitter surface.Fig. 8

Bottom Line: By embedding CNT roots into Ni foil using polymer matrix as transfer media, effective direct contact between Ni and CNTs was achieved.As a result, our novel emitter shows relatively good field emission properties such as low turn-on field and good stability.The gray shadow that appears on the sensitive film after being exposed to the radiation confirms the successful generation of X-ray.

View Article: PubMed Central - PubMed

Affiliation: National Key Laboratory of Micro/Nano Fabrication Technology, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.

ABSTRACT
This paper reports a novel implanting micromachining technology. By using this method, for the first time, we could implant nano-scale materials into milli-scale metal substrates at room temperature. Ni-based flexible carbon nanotube (CNT) field emitters were fabricated by the novel micromachining method. By embedding CNT roots into Ni foil using polymer matrix as transfer media, effective direct contact between Ni and CNTs was achieved. As a result, our novel emitter shows relatively good field emission properties such as low turn-on field and good stability. Moreover, the emitter was highly flexible with preservation of the field emission properties. The excellent field emission characteristics attributed to the direct contact and the strong interactions between CNTs and the substrate. To check the practical application of the novel emitter, a simple X-ray imaging system was set up by modifying a traditional tube. The gray shadow that appears on the sensitive film after being exposed to the radiation confirms the successful generation of X-ray.

No MeSH data available.