Abstract
Laterally aligned carbon nanotube (CNT) arrays “blossomed” homogeneously in honeycomb holes of a metal grid substrate were explored as rational architecture for field emission. A low turn-on field (TOF) of 1.09 V/μm for 10 μA/cm2 emission was achieved, which approaches or exceeds the lowest reported TOF values for field emitter arrays. We interpret that these lateral CNT arrays act as source of CNT “loop” arrays enabling a structure suited toward low TOF field emission.
Highlights
Carbon nanotubes (CNTs) have attracted great attention as electron sources for field emission because of their superior aspect ratio, electrical conductivity, thermal stability, and mechanical robustness.[1]
One of the reasons why CNTs are expected as excellent field emitters is because an individual CNT resembles a nanoscopic needle which provides a high electrical enhancement at the tip resulting in low turn-on field (TOF)
A high density of CNT emitters is preferred to increase the total emission current, they results in local screening effects which drives up the TOF
Summary
Carbon nanotubes (CNTs) have attracted great attention as electron sources for field emission because of their superior aspect ratio, electrical conductivity, thermal stability, and mechanical robustness.[1]. The density of CNTs in vertically aligned arrays is generally too high resulting in significant screening effects from the neighboring nanotubes, which adversely affects their field emission performance, especially the required operating power.[14] far, a low TOF from a CNT assembly utilizing these aligned CNT arrays has been rarely reported/achieved.
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