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Volume 21
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10.3390/s21144624
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Article

Deposition of a SiO2 Shell of Variable Thickness and Chemical Composition to Carbonyl Iron: Synthesis and Microwave Measurements

by
Arthur V. Dolmatov
1,2,
Sergey S. Maklakov
1,*,
Polina A. Zezyulina
1,
Alexey V. Osipov
1,
Dmitry A. Petrov
1,
Andrey S. Naboko
1,
Viktor I. Polozov
1,2,
Sergey A. Maklakov
1,
Sergey N. Starostenko
1 and
Andrey N. Lagarkov
1
1
Institute for Theoretical and Applied Electromagnetics RAS, Izhorskaya St. 13, 125412 Moscow, Russia
2
Moscow Institute of Physics and Technology, National Research University, 9 Institutskiy per., 141700 Dolgoprudny, Russia
*
Author to whom correspondence should be addressed.
Sensors 2021, 21(14), 4624; https://doi.org/10.3390/s21144624
Submission received: 28 May 2021 / Revised: 1 July 2021 / Accepted: 2 July 2021 / Published: 6 July 2021
(This article belongs to the Special Issue Sensors and Biosensors Related to Magnetic Nanoparticles)
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Abstract

Protective SiO2 coating deposited to iron microparticles is highly demanded both for the chemical and magnetic performance of the latter. Hydrolysis of tetraethoxysilane is the crucial method for SiO2 deposition from a solution. The capabilities of this technique have not been thoroughly studied yet. Here, two factors were tested to affect the chemical composition and the thickness of the SiO2 shell. It was found that an increase in the hydrolysis reaction time thickened the SiO2 shell from 100 to 200 nm. Moreover, a decrease in the acidity of the reaction mixture not only thickened the shell but also varied the chemical composition from SiO3.0 to SiO8.6. The thickness and composition of the dielectric layer were studied by scanning electron microscopy and energy-dispersive X-ray analysis. Microwave permeability and permittivity of the SiO2-coated iron particles mixed with a paraffin wax matrix were measured by the coaxial line technique. An increase in thickness of the silica layer decreased the real quasi-static permittivity. The changes observed were shown to agree with the Maxwell Garnett effective medium theory. The new method developed to fine-tune the chemical properties of the protective SiO2 shell may be helpful for new magnetic biosensor designs as it allows for biocompatibility adjustment.
Keywords: protective coating; soft magnetic powder; microwave permittivity; core–shell particles protective coating; soft magnetic powder; microwave permittivity; core–shell particles

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MDPI and ACS Style

Dolmatov, A.V.; Maklakov, S.S.; Zezyulina, P.A.; Osipov, A.V.; Petrov, D.A.; Naboko, A.S.; Polozov, V.I.; Maklakov, S.A.; Starostenko, S.N.; Lagarkov, A.N. Deposition of a SiO2 Shell of Variable Thickness and Chemical Composition to Carbonyl Iron: Synthesis and Microwave Measurements. Sensors 2021, 21, 4624. https://doi.org/10.3390/s21144624

AMA Style

Dolmatov AV, Maklakov SS, Zezyulina PA, Osipov AV, Petrov DA, Naboko AS, Polozov VI, Maklakov SA, Starostenko SN, Lagarkov AN. Deposition of a SiO2 Shell of Variable Thickness and Chemical Composition to Carbonyl Iron: Synthesis and Microwave Measurements. Sensors. 2021; 21(14):4624. https://doi.org/10.3390/s21144624

Chicago/Turabian Style

Dolmatov, Arthur V., Sergey S. Maklakov, Polina A. Zezyulina, Alexey V. Osipov, Dmitry A. Petrov, Andrey S. Naboko, Viktor I. Polozov, Sergey A. Maklakov, Sergey N. Starostenko, and Andrey N. Lagarkov. 2021. "Deposition of a SiO2 Shell of Variable Thickness and Chemical Composition to Carbonyl Iron: Synthesis and Microwave Measurements" Sensors 21, no. 14: 4624. https://doi.org/10.3390/s21144624

APA Style

Dolmatov, A. V., Maklakov, S. S., Zezyulina, P. A., Osipov, A. V., Petrov, D. A., Naboko, A. S., Polozov, V. I., Maklakov, S. A., Starostenko, S. N., & Lagarkov, A. N. (2021). Deposition of a SiO2 Shell of Variable Thickness and Chemical Composition to Carbonyl Iron: Synthesis and Microwave Measurements. Sensors, 21(14), 4624. https://doi.org/10.3390/s21144624

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