Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

Šimkienė, I.; Баран, М.; Babonas, G.-J.; Bendorius, R. A.; Rėza, A.; Szymczak, R.; Aleshkevych, P.; Šustavičiūtė, R.; Tamaševičius, Remigijus

doi:10.12693/aphyspola.107.400

Cited by 5 publications

(9 citation statements)

References 14 publications

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“…The process of self-formation of Fe-containing nanoparticles and clusters depends on chemical composition of precursor, conditions of growth procedure, and postgrowth thermal treatment [7][8][9]. The hybrid samples under investigation were prepared from the same precursor containing FeCl 3 and annealed in the same Ar atmosphere.…”

Section: Structural Featuresmentioning

confidence: 99%

“…In the case of nonhomogeneous surface films, spectroscopic ellipsometry allows one to determine in-depth variation of optical characteristics [14]. When composite/hybrid films are studied, lateral non-homogeneity can be taken into account [7][8][9] by introducing effective medium models [15]. Figure 5 presents ellipsometric data for multiple SiO 2 layers deposited on Si by sol-gel spin-on technique.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…However, instead of bulk insulating matrices, multilayer structures produced by planar technology using a spinon technique are the most promising systems for practical applications. Silica layers of controlled porosity were produced on Si wafers by varying the technological procedure [7]. It was found that physical properties of hybrid samples containing Fe/Fe-O particles in silica on Si depended critically on the chemical composition of precursors (FeCl 3 and Fe(CH 3 COO) 3 ) [8], technological procedure ("one-pot" and "two-pots" technique) [9], as well as on the post-growth thermal treatment in various atmospheres (air, Ar, and H 2 ) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Silica layers of controlled porosity were produced on Si wafers by varying the technological procedure [7]. It was found that physical properties of hybrid samples containing Fe/Fe-O particles in silica on Si depended critically on the chemical composition of precursors (FeCl 3 and Fe(CH 3 COO) 3 ) [8], technological procedure ("one-pot" and "two-pots" technique) [9], as well as on the post-growth thermal treatment in various atmospheres (air, Ar, and H 2 ) [7]. The magnetic properties were mostly expressed in the SiO 2 :Fe/SiO 2 /Si samples annealed in hydrogen [8].…”

Section: Introductionmentioning

confidence: 99%

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Self-formation of Fe/Fe-O nanoparticles in porous SiO₂films

Šimkienė¹,

Sabataityte²,

Баран³

et al. 2005

Lith. J. Phys.

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Self-formation of Fe/Fe-O particles in porous SiO2 films has been studied by investigating the structure and physical properties of hybrid samples SiO2:Fe/SiO2/Si. The sol-gel spin-on technique was used for the formation of Fe-doped silica films on silica-coated Si wafers. The sol was prepared from precursors composed of ethanol and/or aqueous solutions of tetraethoxysilane (TEOS) and FeCl3. As-grown hybrid samples were annealed in Ar atmosphere. Structural studies by means of atomic force microscopy (AFM) have shown a different morphology of samples produced from precursors with various Fe-amount. Spectroscopic ellipsometry measurements were carried out for characterization of the contribution of Fe/Fe-O clusters to the optical response of hybrid samples. Magnetic properties of Fe-doped silica films were studied by measuring the magnetic field and temperature dependences of magnetization. Experimental data were interpreted taking into account particular features of Fe and Fe-O nanoparticles in silica matrix.

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Section: Structural Featuresmentioning

confidence: 99%

Section: Optical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Self-formation of Fe/Fe-O nanoparticles in porous SiO₂films

Šimkienė¹,

Sabataityte²,

Баран³

et al. 2005

Lith. J. Phys.

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“…Sol-gel technique was widely used [6] to produce Fe-containing silica films of different porosity [7]. It was found [6] that magnetic and optical properties of Fe-doped silica films were strongly dependent on technological procedure, i. e., on the preparation of precursors and post-growth thermal treatment in various ambient gases.…”

Section: Introductionmentioning

confidence: 99%

Controlled formation of Fe nanoparticles in silica

Šimkienė¹

2006

Lithuanian J. Phys.

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The SiO2:Fe films on Si substrates were produced by sol-gel and spinning techniques. Hybrid organic-inorganic precursor (tetraethoxysilane-FeCl3) and organic alkoxide precursor modified from Fe acetate were used. The Fe nanoparticles have been formed by various technological procedures. The structural, magnetic and optical characteristics of (SiO2:Fe) / Si samples depending on technology of sample preparation were examined. The size of Fe nanoparticles was shown to be controlled by precursor preparation procedure. It was found that Fe-containing nanocrystals of average size ∼40 nm were formed by "one-pot" technique from the mixture of solutions containing Fe salts and freshly prepared colloidal tetraethoxysilane (TEOS). In contrast, in the "two-pots" procedure, the components of precursor were prepared non-simultaneously and the structurized TEOS sol was used. In the latter case, Fe nanoparticles were distributed in size over a larger range with a mean value at ∼25 nm. It was hence concluded that precursor-controlled formation of Fe nanoparticles can be achieved using different sol-gel technological procedures.

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