Evolution of nanocrystal size distribution in porous silicon nanoparticles during storage in aqueous media: X-ray diffraction analysis

Kharin, Alexander; Kargina, Yu. V.; Timoshenko, V. Yu.

doi:10.1007/s11051-019-4466-9

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…In order to characterize the crystalline nature of the nPSi microparticles embedded into the hydrogels, samples were analyzed by X-ray diffraction (XRD) (Figure 4C). Diffractogram of nPSi revealed their characteristic peaks of Si corresponding to the (111), (220), and (311) crystallographic plane at 27.9º, 46.6º and 55.2º, respectively [32]. The low intensity and high broadness of the peaks is due to the small nanocrystallite size in nanoporous dust, in agreement with previously inside nPSi sponge structures [32].…”

Section: Resultssupporting

confidence: 87%

“…Diffractogram of nPSi revealed their characteristic peaks of Si corresponding to the (111), (220), and (311) crystallographic plane at 27.9º, 46.6º and 55.2º, respectively [32]. The low intensity and high broadness of the peaks is due to the small nanocrystallite size in nanoporous dust, in agreement with previously inside nPSi sponge structures [32]. However, when nPSi was embedded into hydrogels, peaks slightly shifted to higher two theta values, and the intensity of peaks increased according to nPSi concentration.…”

Section: Resultsmentioning

confidence: 99%

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Nanoporous silicon microparticles embedded into oxidized hyaluronic acid/adipic acid dihydrazide hydrogel for enhanced controlled drug delivery

França

Plaza

Naveas

et al. 2021

Microporous and Mesoporous Materials

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Nanoporous silicon microparticles embedded into oxidized hyaluronic acid/adipic acid dihydrazide hydrogel for enhanced controlled drug delivery

França

Plaza

Naveas

et al. 2021

Microporous and Mesoporous Materials

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“…The broadening of peaks is attributed to the presence of a significant number of small individual crystallites, the size of which can be evaluated using the Scherrer equation:

where λ is the wavelength of X-ray radiation (λ = 0.154184 nm for our case), K is a dimensionless shape factor close to unity, Δ θ is an FWHM line broadening, and θ is a Bragg angle of the corresponding crystallographic plane. Equation (2) allows us to estimate the value of

= 10–12 nm, which agrees with early published results for the m-PSi [ 50 ].…”

Section: Resultssupporting

confidence: 86%

“…The periodic order of reflexes in the pattern points to the crystalline structure of silicon remained after the processes of etching and ball milling [ 49 ]. Panoramic XRD patterns for crystalline silicon (c-Si) and m-PSi NPs powders given in Figure S2 of Supplementary Materials demonstrate a low fraction of amorphous SiO 2 phase in m-PSi NPs (measured as a ratio between background signal and peak intensity) and preservation of silicon crystalline structure [ 50 ]. The broadening of peaks is attributed to the presence of a significant number of small individual crystallites, the size of which can be evaluated using the Scherrer equation:

Section: Resultsmentioning

confidence: 99%

Antibacterial Effect of Acoustic Cavitation Promoted by Mesoporous Silicon Nanoparticles

Sviridov

Mazina

Ostapenko

et al. 2023

IJMS

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As-prepared mesoporous silicon nanoparticles, which were synthesized by electrochemical etching of crystalline silicon wafers followed by high-energy milling in water, were explored as a sonosensitizer in aqueous media under irradiation with low-intensity ultrasound at 0.88 MHz. Due to the mixed oxide-hydride coating of the nanoparticles’ surfaces, they showed both acceptable colloidal stability and sonosensitization of the acoustic cavitation. The latter was directly measured and quantified as a cavitation energy index, i.e., time integral of the magnitude of ultrasound subharmonics. The index turned out to be several times greater for nanoparticle suspensions as compared to pure water, and it depended nonmonotonically on nanoparticle concentration. In vitro tests with Lactobacillus casei revealed a dramatic drop of the bacterial viability and damage of the cells after ultrasonic irradiation with intensity of about 1 W/cm2 in the presence of nanoparticles, which themselves are almost non-toxic at the studied concentrations of about 1 mg/mL. The experimental results prove that nanoparticle-sensitized cavitation bubbles nearby bacteria can cause bacterial lysis and death. The sonosensitizing properties of freshly prepared mesoporous silicon nanoparticles are beneficial for their application in mild antibacterial therapy and treatment of liquid media.

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“…Both Si/rGO composites show next to the amorphous rGO structure several Si specific crystalline reflexes, e.g., at 28.3°( 111), 47.2°(220) and 56.1°(311). 29,30 With increasing Si content, the reflex intensity rises. The XRD pattern of the used Si nanoparticles is also shown in Fig.…”

Section: = ( ̇( ) + ̇( )) [ ]mentioning

confidence: 99%

Reactive Spray Drying as a One-Step Synthesis Approach towards Si/rGO Anode Materials for Lithium-Ion Batteries

Müllner

Held

Schmidt-Rodenkirchen

et al. 2021

J. Electrochem. Soc.

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Lithium-ion batteries with Si anodes are still attracting increasing attention, particularly due to the high specific energy density. The main disadvantage of silicon as anode material is its reduced cell performance in terms of cycling stability. One promising approach to improve this is embedding silicon nanoparticles in a graphene-like matrix via spray drying. All processes described so far need a time- and energy-intensive two-step-synthesis to obtain the graphene-like rGO structure. Here, we present a reactive spray drying process for synthesis of Si/rGO composites. For proper reactor design, the reaction kinetics are investigated by simultaneous thermal analysis in various atmospheres. We can describe thermal decomposition of GO to rGO as a second-order reaction. STA data also show that additional presence of water in the atmosphere due to the one-step synthesis is negligible at temperatures below 600 °C for both the reaction of GO and the additional oxidation of Si. To evaluate the electrochemical performance, the composites are cycled in a half cell setup. Delithiation capacity after cell formation could be raised from 252 mAh g-1 for GO to 327 mAh g-1 for rGO. In addition, we are able to synthesize Si-containing composites suitable for the anode of LiB using our process.

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Evolution of nanocrystal size distribution in porous silicon nanoparticles during storage in aqueous media: X-ray diffraction analysis

Cited by 6 publications

References 22 publications

Nanoporous silicon microparticles embedded into oxidized hyaluronic acid/adipic acid dihydrazide hydrogel for enhanced controlled drug delivery

Nanoporous silicon microparticles embedded into oxidized hyaluronic acid/adipic acid dihydrazide hydrogel for enhanced controlled drug delivery

Antibacterial Effect of Acoustic Cavitation Promoted by Mesoporous Silicon Nanoparticles

Reactive Spray Drying as a One-Step Synthesis Approach towards Si/rGO Anode Materials for Lithium-Ion Batteries

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