a carbon nanotube electrode includes a plurality of carbon nanotubes as the electron emitter . the manufacturing method involves the preparation of a carbon nanotube paste , screen printing circuits onto a substrate for forming integrated circuits after sintering , screen printing a carbon nanotube with the carbon nanotube paste onto the substrate to form an emitter source , and going through a thermal treatment process and a sintering process to obtain a good - quality carbon nanotube electrode with a threshold voltage lower than 1 . 9 v / μm .