Short multiwalled carbon nanotubes, 95% [COOH Functionalized] (OD: 10-20 nm, ID: 5-10 nm, Length: 0.5-2 um) have potential applications of carbon nanotubes are: (1) additives in polymers; (2) catalysts; (3) electron field emitters for cathode ray lighting elements; (4) flat panel display; (5) gas-discharge tubes in telecom networks; (6) electromagnetic-wave absorption and shielding; (7) energy conversion.