jp062957f_si_001.pdf (152.63 kB)
Chemical Functionalization of Magnetic Carbon-Encapsulated Nanoparticles Based on Acid Oxidation
journal contribution
posted on 2006-10-19, 00:00 authored by Yanwen Ma, Zheng Hu, Leshu Yu, Yemin Hu, Bing Yue, Xizhang Wang, Yi Chen, Yinong Lu, Yang Liu, Junhui HuCarbon-encapsulated nickel nanoparticles were used as the representative magnetic carbon-encapsulated
nanoparticles for chemical functionalization. After oxidation with the mixed acid of H2SO4/HNO3 under a
moderate ultrasonic bath, carboxylic acid groups (−COOH) were effectively generated on the fullerene-like
carbon shells, which in turn were utilized to covalently link octadecylamine through an amide reaction. The
whole chemical process is well characterized by many methods such as Fourier transform infrared spectroscopy,
X-ray photoelectron spectroscopy, thermogravimetry-differential scanning calorimetry, transmission electron
microscopy, and so on, and the self-consistent experimental results were obtained. The results suggested that
the magnetic nanoparticles could be well protected, while their magnetic properties could be utilized to guide
the transfer of the grafted functional species on the particle surface. This provides many possibilities for
potential applications in chemical and biochemical fields.