Fig. 2

Characterization of synthesized nanoparticles. a TEM micrograph of SP (Scale bar: 5 nm). b Number average hydrodynamic size distribution measured by DLS. c Magnetization curve of SP as a function of magnetic field at 300 K. d FTIR spectra of SP, SP-A and SP-AH. e Dot blot analysis of SP, SP-H and SP-AH. 150 µg from each nanoparticle was loaded on the dot blot nitrocellulose membrane. f Detection of the optical signal from SP-AH nanoparticles using IVIS imaging system