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Ultrasonic nanowelding technique was used to improve the field emission properties of carbon nanotube (CNT) cathodes. Two kinds of welding heads were used and the effects of the head on the emission properties were studied. The results show that cathodes welded by Al 2 O 3 flat head demonstrate excellent field emission properties with high emission current density and good current...
Multi walled carbon nanotubes (MCNT) synthesized by CVD method have been successfully cut into different lengths by controlling H 2 SO 4 /HNO 3 (5:3) oxidation time. During the cutting process H 2 SO 4 and HNO 3 were added independently and the oxidation processes were carried out at a lower temperature to void excess weight loss and damage to MCNT....
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