Carbon nanotube loop arrays for low-operational power, high uniformity field emission with long-term stability

Field Emission from Lateral Multiwalled Carbon Nanotube Yarn Emitters

“…When we consider the morphology of the yarn, some outmost MWCNTs protrude out from the surface, as shown in Figure 2D. They look just like CNT loops in other reports (Konishi et al, 2005;Futaba et al, 2012). Electrons can be easily extracted out from these protruding MWCNTs due to the concentrated electric field compared with other MWCNTs inside the yarn.…”

“…Experimentally, an individual loop-shaped CNT was studied to explain electron emission from the side wall of the CNT (Konishi et al, 2005;Chai and Chow, 2007). In addition, another study using the CNT loop arrays showed that the efficient emission occurred at the loop apex (Futaba et al, 2012). Furthermore, it has also been demonstrated that horizontally aligned CNT emitters were considerably more stable and uniform than vertically aligned CNT emitters (Jung et al, 2007a).…”

Influence of total gas flow on carbon nanotube forests synthesised by water-assisted chemical vapour deposition

“…1. Introduction: Carbon nanotube (CNT) forests have been extensively investigated to exploit their unique mechanical, thermal and electrical properties for applications spanning from field emission devices [1], supercapacitors [2] and electrochemical sensors [3] to oil sorbents [4]. The real applications often need large amounts of CNT bulk materials, thus research on highly efficient growth of CNT forests is still necessary although much effort has been made on this.…”

Field emission from laterally aligned carbon nanotube flower arrays for low turn-on field emission

“…8 Previously, a low TOF of 1.27 V/μm from a CNT loop array had been demonstrated. 8 In that work, the CNT loops were grown randomly from catalyst on a surface. Here we interpret that these lateral CNT films act as source of CNT "loop" arrays enabling an even lower TOF.…”

“…Here, stems one of the challenges to develop practical CNT field emitter devices. To achieve low TOF, much effort has been made to tailor the architecture of CNT emitters, and various two-dimensional CNT emitters have been fabricated including loops, 8 meshes, 9 yarn carpets, 10 and fullerene/CNT hybrids. 5 The fundamental difficulty of this issue is a low TOF field emitter array requires a very fine topographical structure control on a nanometer to sub-micrometer scale.…”