&lt;title&gt;Sol-gel processed iron-containing silica films on Si&lt;/title&gt;

Šimkienė, I.; Sabataityte, J.; Babonas, J.; Rėza, A.; Szymcżak, R.; Szymczak, H.; Баран, М.; Kozłowski, Mirosław; Gierlotka, S.

doi:10.1117/12.639165

Cited by 4 publications

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“…The coating solution was deposited on n-Si (0.5 Ωcm) wafers by spinning at 2500 rpm. The structure composed of hybrid material, i. e., Fe clusters imbedded in silica, were dried in air at 95 • C for 0.5 h and annealed in H 2 ambient at 550 • C for 2 h. As it has been concluded previously [6], annealing in H 2 ambient favours formation of small Fe-containing nanoparticles with prevailing composition of pure Fe.…”

Section: Methodsmentioning

confidence: 99%

“…The samples (SiO 2 :Fe) / Si were prepared by sol-gel spin-on technique described elsewhere [6]. The precursor was made by mixing the solution of Fe compound with either freshly prepared colloidal tetraethoxysilane (TEOS) ethanol solution ("one-pot" reaction, 1-type samples) or with a structurized TEOS sol ("two-pots" reaction, 2-type samples).…”

Section: Methodsmentioning

confidence: 99%

“…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. Therefore, the actual problem is to reveal the typical regularities in the formation of metal nanoparticles and on the basis of the obtained results to develop the technique for the control the size, composition, and physical properties of self-formed precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controlled formation of Fe nanoparticles in silica

Šimkienė¹

2006

Lithuanian J. Phys.

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“…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%

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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Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

et al. 2005

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Iron-containing nanoparticles and clusters were formed in silica with porosity, which was predetermined by different procedures of sol-gel technology and the chemical composition of precursors. Bulk and layer-type samples of different porosity were synthesized and investigated. The morphology, magnetic, and optical properties were studied to characterize the samples and to analyze the formation of Fe-oxides. Experimental results showed that both Fe 2 O 3 and Fe 3 O 4 were formed in the samples and that their relative amount was dependent on preparation technology.

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<title>Sol-gel processed iron-containing silica films on Si</title>

Cited by 4 publications

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Controlled formation of Fe nanoparticles in silica

Controlled formation of Fe nanoparticles in silica

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

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

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<title>Sol-gel processed iron-containing silica films on Si</title>

Cited by 4 publications

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Controlled formation of Fe nanoparticles in silica

Controlled formation of Fe nanoparticles in silica

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

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

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Product

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