Facile hydrothermal synthesis of ZnCo_2O_4 nanostructures: controlled morphology and magnetic properties

摘要

The cubic spinel ZnCo_2O_4 nanostructures with different novel shapes have been purposefully fabricated in an efficient hydrothermal synthetic platform by just tuning reaction temperature. XRD, FTIR, SEM, Raman scattering, and M-H curves were used to analyze the samples. With the decrease of hydrothermal temperature, the morphology has an obvious transformation from hierarchical microsphere to finally loosened nanosphere, an obvious blue shifting of Raman spectrum happened and the samples transform from paramagnetic behavior to ferromagnetic. The elevated He may be attributed to the size effect, surface spin disorder, and shape anisotropy.