Limits...
Field Emission Characteristics of the Structure of Vertically Aligned Carbon Nanotube Bundles.

Lin PH, Sie CL, Chen CA, Chang HC, Shih YT, Chang HY, Su WJ, Lee KY - Nanoscale Res Lett (2015)

Bottom Line: In this study, we performed thermal chemical vapor deposition for growing vertically aligned carbon nanotube (VACNT) bundles for a field emitter and applied photolithography for defining the arrangement pattern to simultaneously compare square and hexagonal arrangements by using two ratios of the interbundle distance to the bundle height (R) of field emitters.The fluorescent images of the synthesized VACNT bundles manifested the uniformity of FE currents.The results of our study indicate the feasibility of applying the VACNT field emitter arrangement to achieve optimal FE performance.

View Article: PubMed Central - PubMed

Affiliation: Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan, plin21@mail.ntust.edu.tw.

ABSTRACT
In this study, we performed thermal chemical vapor deposition for growing vertically aligned carbon nanotube (VACNT) bundles for a field emitter and applied photolithography for defining the arrangement pattern to simultaneously compare square and hexagonal arrangements by using two ratios of the interbundle distance to the bundle height (R) of field emitters. The hexagon arrangement with R = 2 had the lowest turn-on electric field (E to) and highest enhancement factor, whereas the square arrangement with R = 3 had the most stable field emission (FE) characteristic. The number density can reveal the correlation to the lowest E to and highest enhancement factor more effectively than can the R or L. The fluorescent images of the synthesized VACNT bundles manifested the uniformity of FE currents. The results of our study indicate the feasibility of applying the VACNT field emitter arrangement to achieve optimal FE performance.

No MeSH data available.


SEM images of VACNT bundles of different arrangements. a Square, R = 2. b Square, R = 3. c Hexagon, R = 2. d Hexagon, R = 3
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4504873&req=5

Fig1: SEM images of VACNT bundles of different arrangements. a Square, R = 2. b Square, R = 3. c Hexagon, R = 2. d Hexagon, R = 3

Mentions: Figure 1 shows the tilted SEM images of the synthesized VACNT bundles. Each synthesis of CNT bundles was grown regularly according to the designed mask pattern. The arrangement patterns of samples A and B were square, and samples C and D were hexagonal. The lengths of samples A and C were 30 μm and those of samples B and D were 45 μm, and the calculated number densities of the VACNT bundles of samples A, B, C, and D were 1.0 × 105, 4.9 × 104, 1.6 × 105, and 7.0 × 104 cm−2, respectively.Fig. 1


Field Emission Characteristics of the Structure of Vertically Aligned Carbon Nanotube Bundles.

Lin PH, Sie CL, Chen CA, Chang HC, Shih YT, Chang HY, Su WJ, Lee KY - Nanoscale Res Lett (2015)

SEM images of VACNT bundles of different arrangements. a Square, R = 2. b Square, R = 3. c Hexagon, R = 2. d Hexagon, R = 3
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4504873&req=5

Fig1: SEM images of VACNT bundles of different arrangements. a Square, R = 2. b Square, R = 3. c Hexagon, R = 2. d Hexagon, R = 3
Mentions: Figure 1 shows the tilted SEM images of the synthesized VACNT bundles. Each synthesis of CNT bundles was grown regularly according to the designed mask pattern. The arrangement patterns of samples A and B were square, and samples C and D were hexagonal. The lengths of samples A and C were 30 μm and those of samples B and D were 45 μm, and the calculated number densities of the VACNT bundles of samples A, B, C, and D were 1.0 × 105, 4.9 × 104, 1.6 × 105, and 7.0 × 104 cm−2, respectively.Fig. 1

Bottom Line: In this study, we performed thermal chemical vapor deposition for growing vertically aligned carbon nanotube (VACNT) bundles for a field emitter and applied photolithography for defining the arrangement pattern to simultaneously compare square and hexagonal arrangements by using two ratios of the interbundle distance to the bundle height (R) of field emitters.The fluorescent images of the synthesized VACNT bundles manifested the uniformity of FE currents.The results of our study indicate the feasibility of applying the VACNT field emitter arrangement to achieve optimal FE performance.

View Article: PubMed Central - PubMed

Affiliation: Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan, plin21@mail.ntust.edu.tw.

ABSTRACT
In this study, we performed thermal chemical vapor deposition for growing vertically aligned carbon nanotube (VACNT) bundles for a field emitter and applied photolithography for defining the arrangement pattern to simultaneously compare square and hexagonal arrangements by using two ratios of the interbundle distance to the bundle height (R) of field emitters. The hexagon arrangement with R = 2 had the lowest turn-on electric field (E to) and highest enhancement factor, whereas the square arrangement with R = 3 had the most stable field emission (FE) characteristic. The number density can reveal the correlation to the lowest E to and highest enhancement factor more effectively than can the R or L. The fluorescent images of the synthesized VACNT bundles manifested the uniformity of FE currents. The results of our study indicate the feasibility of applying the VACNT field emitter arrangement to achieve optimal FE performance.

No MeSH data available.