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Mohammad KHOSROSHAHI, Iman TEHRANI, Alireza NOURI; Fabrication and characterization of multilayer mSiO2@Fe3O4@Au mesoporous nanocomposite for near-infrared biomedical applications; Advanced Nano-Bio-Materials and Devices; 2018:2(1):230-246
Gold coated mesoporous silica magnetic nanocomposite (mSiO2@Fe3O4 @Au) was synthesized using ethylene glycol (EG) as template at two different ratios of EG: TEOS of 0.1 and 0.6. The chemistry, morphology, optical and magnetic properties of the obtained nanocomposites were characterized by Fourier Transform (FTIR), Scanning Electron Microscopy (SEM), Transverse Electron Microscopy (TEM), Atomic Force Microscopy (AFM), X-ray Diffractometry (XRD), Vibrating Sample Magnetometry (VSM) and UV-Vis absorption spectroscopy. The mean diameter of amino-functionalized SiO2 NPs was measured 70 nm. The range of porosity ranged from 10 to 100 nm, with larger distribution of pore size of less than 20 nm. The average radius of pores on SiO2 NPs calculated by BJH method is approximately 15.5 nm. Magnetic nanoparticles (MNPs) with the average diameter of 34nm were synthesized and then coated by AuNPs with an average size of 25 nm synthesized via a two-step process of dative and reduction method. The average size distribution of mSiO2@Fe3O4@Au nanocomposite was measured about 157 nm. The nanocomposite exhibited a significant red-shift in surface plasmon resonance wavelength (λSPR ≈ 800 nm), which coincides with NIR biomedical applications.