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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.


Raman spectrum for (a) Ni film, (b) CNT, and (c) Ni-CNT emitter surface
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Fig5: Raman spectrum for (a) Ni film, (b) CNT, and (c) Ni-CNT emitter surface

Mentions: Figure 5 shows the two sharp peaks at 1350 cm−1 (D bond) and 1580 cm−1 (G bond) representing typical characteristics of amorphous and graphite carbons, respectively. The appearance of those two peaks in the emitter surface indicated that the CNTs were successfully transferred onto the Ni substrate by the implanting process. The D bond at approximately 1350 cm−1 is generally attributed to defects in the curved graphite sheet or other impurities, while the G bond at approximately 1580 cm−1 is corresponding to the opposite direction movement of two neighboring carbon atoms in a graphitic sheet, and it indicates the presence of crystalline graphitic carbon in CNTs. It shows that the ID/IG ratio of pristine CNT is 0.721 and it increases to 0.847 after the preparation process, indicating decreased crystallinity and improved defects in the CNTs. The main reason for this phenomenon is that the ball-milling process was used to disperse CNTs into the transfer media (PI). The ball-milling process not only decreased the CNT aggregate size but also changed some CNTs into amorphous carbon. Also from the results, we can see that the ID/IG ratio (0.847) of the CNTs on the emitter keeps almost the same as the ID/IG ratio (0.849) of the CNTs after the ball-milling process. It is believed that the chemical wet etching process brings negligible structural changes to the CNTs.Fig. 5


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

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

Raman spectrum for (a) Ni film, (b) CNT, and (c) Ni-CNT emitter surface
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig5: Raman spectrum for (a) Ni film, (b) CNT, and (c) Ni-CNT emitter surface
Mentions: Figure 5 shows the two sharp peaks at 1350 cm−1 (D bond) and 1580 cm−1 (G bond) representing typical characteristics of amorphous and graphite carbons, respectively. The appearance of those two peaks in the emitter surface indicated that the CNTs were successfully transferred onto the Ni substrate by the implanting process. The D bond at approximately 1350 cm−1 is generally attributed to defects in the curved graphite sheet or other impurities, while the G bond at approximately 1580 cm−1 is corresponding to the opposite direction movement of two neighboring carbon atoms in a graphitic sheet, and it indicates the presence of crystalline graphitic carbon in CNTs. It shows that the ID/IG ratio of pristine CNT is 0.721 and it increases to 0.847 after the preparation process, indicating decreased crystallinity and improved defects in the CNTs. The main reason for this phenomenon is that the ball-milling process was used to disperse CNTs into the transfer media (PI). The ball-milling process not only decreased the CNT aggregate size but also changed some CNTs into amorphous carbon. Also from the results, we can see that the ID/IG ratio (0.847) of the CNTs on the emitter keeps almost the same as the ID/IG ratio (0.849) of the CNTs after the ball-milling process. It is believed that the chemical wet etching process brings negligible structural changes to the CNTs.Fig. 5

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.