Author/Authors :
WEN، نويسنده , , Jian-feng and ZHUANG، نويسنده , , Ye and TANG، نويسنده , , Nu-jiang and LU، نويسنده , , Li-ya and ZHONG، نويسنده , , Wei and DU، نويسنده , , You-wei، نويسنده ,
Abstract :
Interconnected carbon micro-spheres (CMSs) with diameters in the range of 3–5 μ m were synthesized by acetylene pyrolysis at 750 °C on a SiO2 substrate. The CMSs have a graphitic structure with many intrinsic defects. Results indicate that the CMSs show both diamagnetic and paramagnetic behavior. Intrinsic defects have magnetic moments with spin 1/2. Approximately every 1000 carbon atoms contribute 1.1 μ B unpaired spins. The unpaired spins have no interactions with each other and show typical Curie-like paramagnetic behavior.
Keywords :
Defects , paramagnetism , carbon micro-spheres , Unpaired spins
