Infrared and Raman spectroscopic studies on iron oxide magnetic nano-particles and their surface modifications

► A modified co-precipitation method to prepare dispersive iron oxide magnetic nano-particles. ► Coating the nano-particle with different silicas. ► Estimating the numbers of iron oxide and 3-aminopropylsilica in the coated particles. ► Silica coating may help to protect iron oxide nano-particles from thermal transformation.