The content of the NPCS in the Co304/NPCS nanocomposites was investigated by TG. The TG curves of the NPCS and the Co304/NPCS nanocomposites are shown in Fig. lc. Below 1000C, the occurrence of a weight loss of about 1.8 wt% can be ascribed to the release of the absorbed gases or moisture on the surface of the twosamples。The pure NPCS is burn off at around 6300C,but the NPCS in the Co304/NPCS nanocomposites is burn off at about 500 0C, which is due to the catalysis of the Co304 nanoparticles 。According to the TG curve, the weight of the NPCS in the Co304/NPCS nanocomposites is around 53.2 wt%.