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通过化学气相沉积法直接在SiO2衬底上750℃裂解乙炔制备出直径约为3~5μm,具有层状结构并含有大量缺陷的相互连接的石墨基碳微米球。结果表明:碳微米球除了表现出通常的抗磁性外,还表现出由于本征缺陷导致的未配对自旋而引起的顺磁性;这些缺陷提供自旋为1/2的磁矩;通过布里渊函数拟合得到,大约平均每1 000个碳原子贡献出1.1μB的未配对自旋磁矩;1/xp-T曲线表明这些未配对自旋之间并没有相互作用,样品表现出典型的居里型顺磁。
The interconnected graphite-based carbon microspheres with a diameter of about 3-5 μm, a layered structure and a large number of defects were prepared by chemical vapor deposition of acetylene directly on the SiO2 substrate at 750 ° C. The results show that in addition to the usual diamagnetism, the carbon microspheres exhibit paramagnetic properties due to unpaired spins caused by intrinsic defects; these defects provide a magnetic moment of spins of ½; The approximation of the fit function yields an average of 1.1 μB unpaired spin moments per 1,000 carbon atoms; the 1 / xp-T curve shows that there is no interaction between these unpaired spins and the sample exhibits a typical Curie paramagnetic.