We report a surface-conducted field emission cathode using ZnO nanotetrapods as the surface conduction emitter. The dependences of electron emission efficiency on ZnO nanotetrapod film thickness and the spacing between adjacent electrodes of surface emitter were studied. A maximum electron emission efficiency of 60% was obtained for an optimal device with film thickness of 8μm and electrode spacing of 0.1mm. A low turn-on voltage of about 100V (corresponding to a field of 1V∕μm) at an emission current density of 0.6mA∕cm2 was obtained which is good enough for field emission displays. Good stability and uniformity were also demonstrated.
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Li et al. (2007) studied this question.
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