ZHANG Wei-ke, FU Jun-jie, CHANG Jie, ZHANG Min, YANG Yan-qing, GAO Li-zhen. Fabrication and purification of carbon nano onions. New Carbon Mater., 2014, 29(5): 398-403.
Citation:
ZHANG Wei-ke, FU Jun-jie, CHANG Jie, ZHANG Min, YANG Yan-qing, GAO Li-zhen. Fabrication and purification of carbon nano onions. New Carbon Mater., 2014, 29(5): 398-403.
ZHANG Wei-ke, FU Jun-jie, CHANG Jie, ZHANG Min, YANG Yan-qing, GAO Li-zhen. Fabrication and purification of carbon nano onions. New Carbon Mater., 2014, 29(5): 398-403.
Citation:
ZHANG Wei-ke, FU Jun-jie, CHANG Jie, ZHANG Min, YANG Yan-qing, GAO Li-zhen. Fabrication and purification of carbon nano onions. New Carbon Mater., 2014, 29(5): 398-403.
Carbon nano onions (CNOs) with diameters of 70-100 nm were fabricated by chemical vapor deposition at 800 ℃, using methane as carbon source and high-temperature steam treated 316 stainless steel mesh as catalyst. The CNOs were isolated from the substrate by HNO3 refluxing, calcination in air at 500℃ and magnetic separation. The morphology, microstructures and magnetic properties of the CNOs were characterized by SEM, TEM, XRD, Raman spectroscopy, FTIR spectroscopy and vibration sample magnetometer tests. Results showed that the surface attached catalyst particles and amorphous carbon can be effectively removed from raw CNOs through HNO3 refluxing and calcination. Magnetic separation can selectively remove the CNOs encapsulating a [Ni,Fe] magnetic catalyst from the CNOs that are hollow.
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