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A good quality graphene is transferred onto honeycomb-like CNTs arrays with inner supporting CNTs. The efficient field emission is demonstrated due to a high aspect ratio protrusions and graphene crack edges. A high efficient current density about 1.2 mA/cm2 at threshold electric field of 7.8 V/μm with a turn-on electric field of 1.8 V/μm at the current density of 10 μA/cm2 is observed due to high...
An efficient surface‐conducted field emission lamp (FEL) is fabricated by zinc oxide nanotetrapod (ZNT) and magnesium oxide (MgO) composite emitter. A comparison of different ratios of ZNT/MgO is promoted to demonstrate the available emitters with a high current density in such structure. As revealed by scanning electron microscopy (SEM) and vacuum test, 2:1 ZNT/MgO has the lowest turn‐on electric...
A surface-conducted field emission cathode with zinc oxide nanotetrapod and nanoparticle with high secondary electron yield is developed in this study. Low-magnification scanning electron microscopy and diode testing are used to characterize the emitter.
As experimental results show, a lower turn on electric field of 1.2V/mum is achieved, and a total emission current of 20 mA is obtained from a 0.8 cm2 area ZnO nanostructures-based cathode, which is enough for radiating an adequate x-ray dose. Furthermore, a good focus performance of electron beam is also obtained with the new focusing electrode-pattern. The ZnO nanostructures-based cold cathode x-ray...
In this letter, we report a new kind of hybrid field emitters with the mixture of ZnO nanotetrapods and MgO particles by spin-coating method. Due to the excellent field emission properties of the hybrid field emitters, the turn-on electric field (at a current density of 1 muA/cm2) and threshold electric field (at a current density of 1 mA/cm2) have been reduced to 0.6 nu/mum and 0.92 V/mum, respectively...
In this letter, we report a new kind of hybrid field emitters with a mixture of ZnO nano-tetrapods and MgO particles by a spin-coating method. Due to the excellent field-emission properties of hybrid field emitters, the turn-on electric field (at a current density of 1 ??A/cm2) and the threshold electric field (at a current density of 1 mA/cm2) have been reduced to 0.6 and 0.92 V/??m, respectively...
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