Kinetics of crack formation in porous silicon

Гаев, Д. С.; Рехвиашвили, С. Ш.

doi:10.1134/s1063782612020108

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…The dominant factor is the capillary force, which is responsible for high tensile stresses during drying, and leads to the destruction of the PSi film from Si substrate. The mechanism of crack formation and self-peeling during drying has been reported previously [ 25 , 26 , 28 , 29 , 30 , 31 , 32 ]. During drying, when liquid evaporates from the pores, the PSi films are under lateral stress and stress normal to surface and will shrink or crack to minimize the total surface and reduce the total energy of the system.…”

Section: Resultsmentioning

confidence: 70%

Wafer-Scale Fabrication and Transfer of Porous Silicon Films as Flexible Nanomaterials for Sensing Application

Jin

Zhang

et al. 2022

Nanomaterials

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Flexible sensors are highly advantageous for integration in portable and wearable devices. In this work, we propose and validate a simple strategy to achieve whole wafer-size flexible SERS substrate via a one-step metal-assisted chemical etching (MACE). A pre-patterning Si wafer allows for PSi structures to form in tens of microns areas, and thus enables easy detachment of PSi film pieces from bulk Si substrates. The morphology, porosity, and pore size of PS films can be precisely controlled by varying the etchant concentration, which shows obvious effects on film integrity and wettability. The cracks and self-peeling of Psi films can be achieved by the drying conditions after MACE, enabling transfer of Psi films from Si wafer to any substrates, while maintaining their original properties and vertical alignment. After coating with a thin layer of silver (Ag), the rigid and flexible PSi films before and after transfer both show obvious surface-enhanced Raman scattering (SERS) effect. Moreover, flexible PSi films SERS substrates have been demonstrated with high sensitivity (down to 2.6 × 10−9 g/cm2) for detection of methyl parathion (MPT) residues on a curved apple surface. Such a method provides us with quick and high throughput fabrication of nanostructured materials for sensing, catalysis, and electro-optical applications.

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Section: Resultsmentioning

confidence: 70%

Wafer-Scale Fabrication and Transfer of Porous Silicon Films as Flexible Nanomaterials for Sensing Application

Jin

Zhang

et al. 2022

Nanomaterials

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“…Note that in the case of pores filled with a substance, such estimates are to be corrected, for example, by modifying the approach suggested by C. Ling-fei et al [14] for embedded nanoparticles. Increasing the specific surface area of porous materials up to the values obtained experimentally by the authors of [22][23][24] allows expecting much more significant shifts of the magnetic transition temperatures similar to the ones obtained in [19] for free-standing nanoparticles.…”

Section: A Cohesive Energy-based Model For Magnetic Phase Transitions In Mesoporous Mediamentioning

confidence: 68%

“…Specific surface areas in micro-and mesoporous materials can reach extremely high values (from 500m 3 /g [22] to 1000 m 3 /g [23] or even several thousands of m 3 /g [24]). In the present paper, however, we limit ourselves to considering materials with not very high specific surface areas (in comparison with the values obtained in [22][23][24]), mostly below 200-300 m 3 /g (α=0.85). The dependences of the Curie temperature on pore size and shape for mesoporous iron (a), nickel (b) and cobalt (c) are plotted in Fig.…”

Section: A Cohesive Energy-based Model For Magnetic Phase Transitions In Mesoporous Mediamentioning

confidence: 99%

“…Note that high surface-to-volume ratios and fractions of surface atoms could be obtained not only in nanopowders or in nanocomposites containing nanoparticles distributed in a matrix, but also in microporous and mesoporous materials, while porous samples of such materials can be macroscopic-sized [22][23][24]. Formation of such structures is possible, for example, during the early stages of spark plasma sintering [25], laser sintering [26] of nanopowders (a review of synthesis methods of nanosized powders has been presented by M.K.…”

Section: Introductionmentioning

confidence: 99%

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Untitled

2021

Eurasian phys. tech. j.

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In this paper, we have shown how the presence of pores and pore morphology influence on magnetic phase transition temperatures in mesoporous ferromagnetic materials. Model calculations have demonstrated the possibility to obtain macroscopic mesoporous samples with notably reduced Curie temperatures which is also further depressed in the case the pore morphology is more complicated. The results have been obtained on the basis of the experimentally verified correlation between the Curie temperature and cohesive energy of the material and illustrated using the examples of pure mesoporous iron, nickel and cobalt while pore morphology has been determined by the methods of fractal geometry. Several practical applications of mesoporous materials with tuned values of the Curie temperature have also been discussed in the final section.

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Drying Techniques Applied to Porous Silicon

Canham¹

2014

Handbook of Porous Silicon

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Kinetics of crack formation in porous silicon

Cited by 15 publications

References 8 publications

Wafer-Scale Fabrication and Transfer of Porous Silicon Films as Flexible Nanomaterials for Sensing Application

Wafer-Scale Fabrication and Transfer of Porous Silicon Films as Flexible Nanomaterials for Sensing Application

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Drying Techniques Applied to Porous Silicon

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