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Facile synthesis of magnetic-fluorescent iron oxide-geothermal silica core/shell nanocomposites via modified sol–gel method

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Abstract

This study successfully synthesizes magnetic fluorescent iron oxide silica core/shell nanocomposites (MFSNC) derived from natural geothermal silica. The nanostructures comprise an iron-oxide core and a fluorescent mesoporous silica outer layer. X-ray diffraction (XRD) analysis indicated diffraction peaks of amorphous silica with crystallites of magnetite types in the MFSNC samples. Transmission electron microscopy combined with energy-disperse X-ray spectroscopy were used to observe the morphological structure, which showed nanoparticles of MFSNC with Fe, Si, O, and N elements. Among varying ratios of ferric salts, the MFSNP0.5 sample exhibited the highest fluorescence intensity (280.5073 a.u.). It demonstrated superior fluorescence stability in water (pH = 7) compared to other samples, as investigated by fluorescence spectrophotometer. Additionally, this sample displayed ferromagnetic properties, with a magnetic saturation (MS) of 14.57 emu/g and a loop area value of 0.7 kOe.emu/g, determined by the vibrating sample magnetometry. This work details the successful synthesis of MFSNC nanocomposites with tailored magnetic and fluorescent properties. Notably, the MFSNC0.5 sample stands out for its superior fluorescence intensity, stability in water, and desirable ferromagnetic characteristics.

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Highlights

  • Synthesizes magnetic fluorescent iron oxide silica core/shell nanocomposites (MFSNC) derived from natural geothermal silica.

  • MFSNC0.5 sample stands out for its superior fluorescence intensity, stability in water, and desirable ferromagnetic characteristics.

  • MFSNC displayed ferromagnetic properties, with a magnetic saturation (MS) of 14.57 emu/g and a loop area value of 0.7 kOe.emu/g.

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Acknowledgements

The authors would like to acknowledge financial support from the JFS SEA-EU/ NAPARBA Project Grant no. SEA-EUROPE JFS19 ST-117 and the BRIN Riset & Inovasi untuk Indonesia Maju (RIIM) Grant No. 19/II.7/HK/2023. The authors acknowledge the facilities, scientific and technical support from the Advanced Characterization Laboratories of the National Research and Innovation Agency (BRIN) through E-Layanan Sains. SNAJ is the main contributor of this manuscript.

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jalan Grafika No 2, Yogyakarta, 55281, Indonesia

    Falah Azizah Elmaria, Yuni Kusumastuti & Himawan Tri Murti Bayu Petrus

  2. Research Center for Chemistry, National Research and Innovation Agency-BRIN, Building 452, Kawasan BJ Habibie, Tangerang Selatan, Banten, 15314, Indonesia

    Falah Azizah Elmaria, Fauzan Aulia, Luthfiana N. Hidayati, Anis Kristiani,  Sudiyarmanto & S. N. Aisyiyah Jenie

  3. Unconventional Geo-Resources Research Center, Faculty of Engineering, Universitas Gadjah Mada UGM, JI, Grafika No. 2, Yogyakarta, 55281, Indonesia

    Himawan Tri Murti Bayu Petrus

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  1. Falah Azizah Elmaria
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Elmaria, F.A., Aulia, F., Hidayati, L.N. et al. Facile synthesis of magnetic-fluorescent iron oxide-geothermal silica core/shell nanocomposites via modified sol–gel method. J Sol-Gel Sci Technol 110, 27–36 (2024). https://doi.org/10.1007/s10971-024-06318-8

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