Carbon-based field emission electron device for high current density applications

An electron gun, comprising:

• a carbon-based body having a thickness greater than about 20 micrometers formed by placing a substrate in a reactor at a selected pressure and bringing the substrate to a selected range of temperature and supplying a mixture of gases comprising a carbon-containing gas and hydrogen to the reactor while supplying energy to the mixture of gases near the substrate for a time sufficient to grow the body and then removing the substrate;
• a first dielectric layer on the carbon-based body;
• a first and a second electrode, the electrodes being separated by a second dielectric layer;
• and
• electrical contacts to the carbon-based body and the electrodes.

A cathode ray tube, comprising:

• an electron gun, the electron gun comprising a carbon-based body having a thickness greater than about 20 micrometers formed by placing a substrate in a reactor at a selected pressure and supplying a mixture of gases comprising a carbon-containing gas and hydrogen to the reactor while supplying energy to the mixture of gas near the substrate for a time sufficient to grow the body and then removing the substrate, a first dielectric layer on the carbon-based body, a first and a second electrode, the electrodes being separated by a second dielectric layer, and electrical contacts to the carbon-based body and the electrodes;
• a housing;
• a base for electrical connections;
• deflection coils;
• and
• a phosphor screen.

A high-frequency amplifier, comprising:

• an insulating base;
• a carbon-based body having a thickness greater than about 20 micrometers formed by placing a substrate in a reactor at a selected pressure and bringing the substrate to a selected temperature range and supplying a mixture of gases comprising a carbon-containing gas and hydrogen to the reactor while supplying energy to the mixture of gas near the substrate for a time sufficient to grow the body and subsequently removing the substrate;
• a dielectric layer;
• an electron extraction electrode;
• a conducting ground plane;
• and
• an anode.

A traveling wave tube, comprising:

• a carbon-based body having a thickness greater than about 20 micrometers formed by placing a substrate in a reactor at a selected pressure and bringing the substrate to a selected range of temperature and supplying a mixture of gases comprising a carbon-containing gas and hydrogen to the reactor while supplying energy to the mixture of gas near the substrate for a time sufficient to grow the body and subsequently removing the substrate;
• a means for signal input;
• an electron extraction electrode;
• a helix means for signal output;
• and
• a beam dump.