Synthesis of C₆₀-Coated Ferric Oxide and Its Application in Detecting Magnetic Field

Dispersibility and magnetic response characteristics of magnetic nanoparticles is crucial to the sensitivity and stability of flexible magnetic field sensors. To improve the performance of magnetic nanoparticles, this paper reported a preparation method of the fullerene-coated ferric oxide (C-60@Fe3O4) magnetic nanocomposites. The TEM results showed that the C-60@Fe(3)O(4)has uniform dispersion and consistent particle size, and C(60)particles are distributed on the surface of Fe3O4, forming a coating structure. The X-ray diffraction, Fourier transform infrared spectroscopy, and energy dispersion spectroscopy results further proved that the compositions of the nanomaterials are Fe(3)O(4)and C-60. The VSM hysteresis loop of the nanocomposites showed good performance in magnetic response. Then, styrene ethylene butylene Styrene (SEBS), the C-60@Fe(3)O(4)magnetic nanoparticles, and CNTs, which were used as flexible substrate, magnetic sensitive unit, and conductive networks, respectively, composed the flexible magnetic field sensor. The measurement results of the flexible magnetic field sensor showed its high sensitivity (2.1 T-1) and good stability. The mechanism of the sensor was explored at last.