Field emission from a single carbon nanofiber at sub 100nm gap

Abstract

The authors report the electron field emission from a single carbon nanofiber (CNF) over a range of anode to CNF tip separations of 20–5500nm. Our results show that the field enhancement factor γ is associated with the electrode separation (S). The modified Miller equation is a reasonable empirical model to describe the behavior of γ, which varies with S over a large range of values. The γ approaches to an asymptotic value of 415 or 1 when S is very large or very small as compared to the length of the CNF, respectively. The maximum field emission current sustained by the single CNF without causing damage was estimated to be as high as 15μA.

Experimental investigation of transition from Fowler–Nordheim field emission to space-charge-limited flows in a nanogap

“…It should be noted that besides the surface properties, ␤ is also dependent on D as was recently demonstrated. 18 For the 50 nm sample, the slope of the graph is found to be ϳ0.5 for V Ͻ ϳ 1 V which shows the onset of QSCL ͑at ϳ0.4 V the ratio D / o ϳ 35͒. The transition from the FN to the QSCL occurs at a much lower V as expected and shown in Fig.…”

Electric field distribution and current emission in a miniaturized geometrical diode

“…However, the finite tip-anode distance is comparable to or even smaller than the tip height, as is often the case in experiments. 21,31,32 Recent studies 33,34 on the effects of finite A-K gap focus only on emitters with vertical walls, where the current rectification behaviors remains unexplored.…”

Field emission properties of chemical vapor deposited individual graphene

“…31 It has been observed that the FE properties strongly depend on graphene-anode (Pt-Ir nanoprobe) distance, unlike the macroscopic FE measurements. [30][31][32] Again, we can directly observe the emitting behaviors of a suspended bi-layer graphene correlating structural changes with the demonstrated technique. Figure 4(a) shows TEM image of the graphene sheet before and after FE measurement were obtained.…”

“…The FN plots can be fitted fairly well by a straight line signifying that FE of the single graphene sheet follows FN model. 30 microscope. 31 It has been observed that the FE properties strongly depend on graphene-anode (Pt-Ir nanoprobe) distance, unlike the macroscopic FE measurements.…”