Title :
High current field emission behaviour of carbon nanofiber film
Author :
Park, Kyung-Ho ; Lee, Soonil ; Koh, Keh-Ha
Author_Institution :
Dept. of Molecular Sci. & Technol., Ajou Univ., Suwon, South Korea
Abstract :
Carbon nanofiber (CNF) films were synthesized using electroplated Ni catalysts on Au buffer layer. The maximum emission current was measured to be 3.67 mA at an electric field of 12.5 V/μm from the area of 4.9×10-3 cm2, which correspond to the very high emission current density of 750 mA/cm2. The peculiar hysteresis in emission currents corresponding to anode-voltage ramping direction leads to the proposal that the observed emission behavior of CNFs stemmed from the adsorption and desorption of adsorbates during emission measurements. Field-emission measurements with various voltage-sweep speed and time evolution supported the picture of adsorbate-related emission.
Keywords :
adsorption; buffer layers; carbon fibres; catalysis; catalysts; current density; desorption; electroplating; field emission; gold; hysteresis; nanostructured materials; nickel; 3.67 mA; Au; Au buffer layer; C; Ni; adsorbate-related emission; adsorption; anode-voltage ramping; carbon nanofiber film; desorption; electroplated Ni catalysts; emission current density; high current field emission; hysteresis; maximum emission current; voltage-sweep speed; Area measurement; Buffer layers; Carbon dioxide; Current density; Current measurement; Density measurement; Electric variables measurement; Gold; Hysteresis; Proposals;
Conference_Titel :
Vacuum Nanoelectronics Conference, 2005. IVNC 2005. Technical Digest of the 18th International
Print_ISBN :
0-7803-8397-4
DOI :
10.1109/IVNC.2005.1619585
