Fractally aggregated micro- and nanosystems synthesized from sols

Kononova, I. E.; Moshnikov, V. A.; Krishtab, Mikhail; Пронин, И. А.

doi:10.1134/s1087659614020102

Cited by 16 publications

(5 citation statements)

References 12 publications

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“…The sensitive elements of vacuum meters repre sent porous nanostructured SiO 2 -SnO 2 sol-gel films [10][11][12]. The films had a spherical structure (nucleo philic growth), a labyrinth structure (spinodal decom position under "chemical" cooling of sols), and a per colation mesh structure.…”

Section: Methodsmentioning

confidence: 99%

Sensitive elements of vacuum sensors based on porous nanostructured SiO2-SnO2 sol-gel films

et al. 2015

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The objects of investigation are porous nanostructured SiO 2 -SnO 2 sol-gel films used as sensitive elements on vacuum sensors. The properties of the films with spherical, labyrinth, and percolation mesh structures are analyzed. It is shown that the resistance of sensitive elements based on these films sharply drops at a pressure below the atmospheric value. Processes taking place in the films at subatmospheric pressures are studied. It is found that the desorption of water vapor increases the resistance of the sensitive elements of vac uum sensors, whereas the desorption of carbon dioxide and oxygen decreases the resistance. This agrees with experimental data.

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Section: Methodsmentioning

confidence: 99%

Sensitive elements of vacuum sensors based on porous nanostructured SiO2-SnO2 sol-gel films

et al. 2015

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“…The CCA mechanism realizes the possibility of clusters motion, but not only the free particles . The kinetics of the CCA mechanism is satisfactorily described by the kinetic equation of Smolukhovsky, concentration fluctuations at the same time can be neglected . Important points in the realization of these mechanisms are the organization of the movement of particles by the method of random walk, detection of collisions, and aggregation of particles.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Mechanism of the formation of copper‐containing fractal‐like crystallites in metal‐organic thin films: Shape simulation and XANES analysis

Yalovega

Myasoedova

Funik

et al. 2016

Physica Status Solidi (b)

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Phone: þ7 928 771 66 57, Fax: þ7 863 297 51 20Copper-containing thin films were synthesized by a citrate sol-gel method using ethylene glycol. The evolution of the shape and local atomic structure of the copper-containing fractal crystallites at different stages of growth was investigated by the combination of experimental and theoretical techniques. A surface morphological study of the deposited film samples was carried out using SEM. It revealed the evolution of the crystallite structures as a function of annealing temperature. To describe this mechanism diffusion-limiting aggregation and cluster-cluster models were used. X-ray absorption spectroscopy (XANES) was applied to show the dynamics of the local atomic structure of Cu ion and the copper oxidation state at different stages of crystallites formation. It was found that at temperatures up to 250 8C the Cu 2 Cl(OH) 3 (atacamite phase) and chelate complex are formed. With temperature increases changes in the local atomic structure as well as in morphology take place and at 500 8C CuO formed. As a result of these processes, the fractal organization of the other level was observed.

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“…The products of sol-gel technology [38][39][40][41][42][43] in microelectronics, as a rule, are layers onto which the requirements of smoothness, continuity and uniformity in composition are imposed. For gas-sensitive sensors of a new generation, technological methods for obtaining porous [44] nanocomposite layers with percolation structure and controlled and reproducible pore sizes are of greater interest.…”

Section: Introductionmentioning

confidence: 99%

Step-by-Step Modeling and Experimental Study on the Sol–Gel Porous Structure of Percolation Nanoclusters

2023

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Non-conventional crystallization techniques have been developed in recent years. Non-conventional crystallization techniques use primary structural elements (for example, clusters) rather than atoms and molecules. Modern nanomaterial science is going through great changes as an entirely new approach of non-conventional growth mechanisms is emerging due to cluster coupling, catalyzing interest in cluster physics. The formation of fractal and percolation clusters has increased. We carried out step-by-step modeling and an experimental study of the formation of fractal and percolation clusters based on tin dioxide and silicon dioxide and formed by sol–gel technology. In this paper, the growth of fractal aggregates (clusters) from sol particles SnO2 and SiO2 based on the modified models of diffusion-limited and cluster–cluster aggregation is discussed. A percolation model using simulated fractal clusters of SnO2 and SiO2 particles is proposed. Experimental data on the sol–gel percolation structure of porous nanocomposites are presented. The modeling of SnO2 and SiO2 particles, which also consist of clusters (the next step in the hierarchy), is shown. We propose a generalized hierarchical three-dimensional percolation cluster model that allows calculating the surface area, knowing the experimental sizes of macropores and taking into account the micro- and mesopores (sizes less than a few nanometers).

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Fractally aggregated micro- and nanosystems synthesized from sols

Cited by 16 publications

References 12 publications

Sensitive elements of vacuum sensors based on porous nanostructured SiO2-SnO2 sol-gel films

Sensitive elements of vacuum sensors based on porous nanostructured SiO2-SnO2 sol-gel films

Mechanism of the formation of copper‐containing fractal‐like crystallites in metal‐organic thin films: Shape simulation and XANES analysis

Step-by-Step Modeling and Experimental Study on the Sol–Gel Porous Structure of Percolation Nanoclusters

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