Experimental studies on electromagnetic-wave attenuationof carbon nanotubes at 8～12 GHz

Based on the elect romagnetic-wave penet ration method , the elect romagnetic-wave attenuation abilities ofsix kinds of carbon nanotubes (CNTs) were studied in experiment at 8～12 GHz , whose diameters were 30 nm ,60 nm and 100 nm , and lengths were 2μm and 15μm. The results show that with the same diameter of 30 nm , theelect romagnetic2wave attenuation ability of CNTs with the length of 15μm is better than that with the length of2μm. With the same diameter of 60 nm , the absorption ability of CNTs with the length of 2μm is bet ter than thatwith the length of 15μm. With the same diameter of 100 nm , the elect romagnetic2wave attenuation ability of CNTswith the length of 2μm is better than that with the length of 15μm. The order of elect romagnetic2wave at tenuationabilities of CNTs with the same length is that Ф60 nm > Ф100 nm > Ф30 nm. At 8～12 GHz , the elect romagnetic2wave attenuation order of the 6 kinds of CNTs is Ф60 nm ×2μm > Ф60 nm ×15μm > Ф100 nm ×2μm > Ф100 nm ×15μm > Ф30 nm ×15μm > Ф30 nm ×2μm. Based on the experiment s , the elect romagnetic-wave at tenuation abilityof CNTs with smaller slenderness ratio is better than that with larger slenderness ratio. However , liner relationshipdoesnpt exist between the absorption ability and slenderness ratio for CNTs.