Preparation of novel magnetic fluorescent nanospheres by sonochemical method

This study focuses on the preparation and characterization of magnetic fluorescent nanospheres (MFNs). MFNs are prepared using a sonochemical method in the presence of hydrophobic Fe₃O₄ nanopaticles, and then the nanospheres are modified with Rhodamine B through an electrostatic interaction. The properties of MFNs are characterized using transmission electron microscopy, Fourier-transform infrared, thermogravimetric analysis, vibration sample magnetometry, and fluorescence emission spectrum. The results indicate that the superparamagnetic nanospheres have a particle size of 160 nm, high saturation magnetization of 54 emu/g, and significant fluorescence. MFNs possess potential in medical imaging, drug targeting, and catalysis. The possible formation mechanism of MFNs is discussed.