Influence of the Surface Layer on the Electrochemical Deposition of Metals and Semiconductors into Mesoporous Silicon

Чубенко, Е. Б.; Redko, Sergey; Sherstnyov, A. I.; Petrovich, V.; Kotov, D. A.; Bondarenko, Vitaly

doi:10.1134/s1063782616030040

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…The observed type of macropores 1 with a skin layer on the surface is typical for porous silicon formed in high-resistance single-crystal p-Si (100) [ 37 , 47 , 48 , 49 ]. The formation of a skin layer in such structures is associated with the removal and redeposition of reaction products during electrochemical anodization during the formation of porous silicon, taking into account the redistribution of the electric field strength over the surface of the growing porous layer.…”

Section: Resultsmentioning

confidence: 99%

“…Such a porous silicon texture can be used as a template for the growth of nanostructured materials on a surface with the further formation of an emission material [ 52 ]. A high-resistance skin layer is effective for por-Si intercalation processes, for example, when metals are introduced into pores electrochemically, since it promotes the concentration of the electric field at the bottom of macropores 1 [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

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Low-Frequency Dielectric Relaxation in Structures Based on Macroporous Silicon with Meso-Macroporous Skin-Layer

et al. 2021

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The spectra of dielectric relaxation of macroporous silicon with a mesoporous skin layer in the frequency range 1–106 Hz during cooling (up to 293–173 K) and heating (293–333 K) are presented. Macroporous silicon (pore diameter ≈ 2.2–2.7 μm) with a meso-macroporous skin layer was obtained by the method of electrochemical anodic dissolution of monocrystalline silicon in a Unno-Imai cell. A mesoporous skin layer with a thickness of about 100–200 nm in the form of cone-shaped nanostructures with pore diameters near 13–25 nm and sizes of skeletal part about 35–40 nm by ion-electron microscopy was observed. The temperature dependence of the relaxation of the most probable relaxation time is characterized by two linear sections with different slope values; the change in the slope character is observed at T ≈ 250 K. The features of the distribution of relaxation times in meso-macroporous silicon at temperatures of 223, 273, and 293 K are revealed. The Havriliak-Negami approach was used for approximation of the relaxation curves ε″ = f(ν). The existence of a symmetric distribution of relaxers for all temperatures was found (Cole-Cole model). A discussion of results is provided, taking into account the structure of the studied object.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Low-Frequency Dielectric Relaxation in Structures Based on Macroporous Silicon with Meso-Macroporous Skin-Layer

et al. 2021

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“…This surface layer usually consists of pores with a lower diameter compared to the pores distributed in the deeper layer, resulting in the so-called "bottleneck" effect. Therefore, it can strongly affect the morphology, mechanical, and electrical properties of the final PS-based device [3]. Such an effect is critical for the mesoporous silicon used to host or to capture nanostructures of other materials.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Mesoporous Silicon Surface to Form a Versatile Template for Nanoparticle Deposition

et al. 2021

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Porous silicon (PS) can be used as a loading template in sensing or as a matrix to develop nanoparticle arrays. We present a comprehensive study of PS morphology and optical properties before and after the pore opening process, including the determination of thickness, pore size, and pore density of PS layers, its surface wettability, and reflectivity. The PS samples were fabricated by electrochemical anodization of monocrystalline silicon wafer in 5–20 wt.% hydrofluoric acid (HF) solution at a current density in the range of 20–200 mA/cm2. Anodization was followed by the pore opening process, i.e., the removal of a parasitic superficial layer with a “bottleneck” structure by reactive ion etching (RIE). The results illustrate that “bottleneck”-free PS allows to achieve a high pore density using a low HF concentration and a reduced current density. We established that this structure demonstrates higher hydrophobicity in comparison to the samples before RIE. The applicability of the developed “bottleneck”-free PS was tested via filling the pores with silver nanoparticles, indicating its potential use as a template for the fabrication of nanoparticle arrays.

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“…In the modern age, metal-semiconductor nanocomposites have drawn significant research interest due to their good prospects in several fields of daily life [38][39][40][41][42]. The physical and chemical characteristics of metallic semiconductor nanocomposites can be improved by selective metallic materials, which can perform a variety of functions such as chemical sensing devices, optical devices, drug delivery, as well as in medical applications [43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Development of bacterial cellulose nanocomposites: An overview of the synthesis of bacterial cellulose nanocomposites with metallic and metallic-oxide nanoparticles by different methods and techniques for biomedical applications

Wasim

Mushtaq

Khan

et al. 2020

Journal of Industrial Textiles

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Bacterial cellulose is the three-dimensional network structure of nanofibers. The bacterial cellulose materials have outstanding characteristics of high surface area and high crystallinity (84%–89%). It has greater compatibility with the degree of polymerization and has excellent mechanical properties. The water-holding capacity of bacterial cellulose (over 100 ti) makes it stand out from other cellulose materials. This is because bacterial cellulose has high purity due to a lack of lignin and hemicellulose. Bacterial cellulose is considered as a non-cytotoxic, non-genotoxic, and highly biocompatible material, which has broad appeal in the medical field and has attracted widespread attention. The proposed review summarizes the microbial effects of enlisting bacterial strains with carbon sources, and culture media on bacterial cellulose production. In addition, it provides a variety of physical and chemical methods that can be used to modify bacterial cellulose with metal and metal oxide nanoparticles; like the common structure of zinc oxide/bacterial cellulose represent antibacterial characteristics against C.freundii, S.aureus, E.coli, and P.aeruginosa with 90.9%, 94.3%, 90.0%, and 87.4% strength respectively. The wound healing properties of such metallic oxide structure with bacterial cellulose presents the characteristics, which confirms its application in 66% of strength, especially for bionic designs for medical applications, including wound healing and artificial skin, vascular and neurosurgical covering materials, dural prosthesis, arterial stent coating, cartilage, bone repair grafts, and biomedicines. Because of the further exposure of value-added medical material application, our review ends with challenges and perspectives in the production of bacterial cellulose nanocomposite.

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Influence of the Surface Layer on the Electrochemical Deposition of Metals and Semiconductors into Mesoporous Silicon

Cited by 16 publications

References 16 publications

Low-Frequency Dielectric Relaxation in Structures Based on Macroporous Silicon with Meso-Macroporous Skin-Layer

Low-Frequency Dielectric Relaxation in Structures Based on Macroporous Silicon with Meso-Macroporous Skin-Layer

Tailoring Mesoporous Silicon Surface to Form a Versatile Template for Nanoparticle Deposition

Development of bacterial cellulose nanocomposites: An overview of the synthesis of bacterial cellulose nanocomposites with metallic and metallic-oxide nanoparticles by different methods and techniques for biomedical applications

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