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It is difficult to achieve effective doping without inducing structural damage in plasma-assisted processes. In this study, we demonstrate the effects of the plasma condition on the doping and defect formation in graphene. Direct-current ammonia plasma with parallel electrodes is used. We change the electrode configuration and adjust the plasma input power and treatment time to utilize various ion-bombardment...
Low-pressure chemical vapor deposition of graphene has been investigated on various Pt substrates such as e-beam deposited films, sputtered films, and polycrystalline foils. High temperature sputtering is found to be crucial in growing single layer graphene on Pt. It gives highly (111)-oriented crystallization with a significant reduction of dewetting in Pt films, in contrast to e-beam deposited Pt...
We report novel two-dimensional (2D) shaped carbon nanotube (CNT) field emitters using triangular-shaped CNT films and their field emission properties. Using the 2D shaped CNT field emitters, we achieved remarkable field emission performance with a high emission current of 22mA (equivalent to an emission current density >105A/cm2) and long-term emission stability at 1mA for 20h. We also discuss...
We demonstrate a very efficient synthesis of vertically-aligned ultra-long carbon nanofibers (CNFs) with sharp tip ends using thermal chemical vapor deposition. Millimeter-scale CNFs with a diameter of less than 50nm are readily grown on palladium thin film deposited Al2O3 substrate, which activate the conical stacking of graphitic platelets. The field emission performance of the as-grown CNFs is...
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