Surface-Functionalized Porous Silicon Wafers: Synthesis and Applications

Bradley, D Fahlman; Ramírez‐Porras, A.

doi:10.5772/31286

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…Si-Si bond intensity is known to develop upon progressive hydrogenation of amorphous silicon (Volodin and Koshelev, 2013). The intense Si-Si bonding is stable for progressive SC-PCS anodization times shown up to 2,400 s. Comparatively, NSC-PS samples (Figure S5B) display an initial increase (up to 500 s anodization time) in Si-Si peak intensity, most likely due to surface functional group electron-withdrawing effects experienced only during low oxidation times (Collins et al, 2013;Fahlman Bradley and Ramírez-Porras, 2012). NSC-PS samples show a decrease in Si-Si bond intensity after only 1,200 s of anodization time, illustrating a significant breakdown of silicon crystallinity from the high strain and Si-Si bond breaking resulting from the increased concentration of O x Si-H y surface groups.…”

Section: Nanostructure and Molecular Analysis: Formation Of Denuded Surfacementioning

confidence: 97%

Diffusion-Controlled Porous Crystalline Silicon Lithium Metal Batteries

et al. 2020

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Summary Nanostructured porous silicon materials have recently advanced as hosts for Li-metal plating. However, limitations involve detrimental silicon self-pulverization, Li-dendrites, and the ability to achieve wafer-level integration of non-composite, pure silicon anodes. compo. Herein, full cells featuring low-resistance, wafer-scale porous crystalline silicon (PCS) anodes are embedded with a nanoporous Li-plating and diffusion-regulating surface layer upon combined wafer surface cleaning (SC) and anodization. LL Lithiophilic surface formation is illustrated via correlation of surface groups and X-ray structure. Low-cost SC-PCS anodes require no composite formulation, and pre-lithiation enables sustainable Li-metal plating/stripping on the lithiophilic surface and in SC-PCS bulk nanostructure. Anodization time and C-rate determined competitive full cell performance: NMC811 | 4800 s SC-PCS: 195 mAh/g (99.9% coulombic efficiency [C.E.], C/3, 50 cycles), 165 mAh/g, 587 Wh/kg (97.1% C.E., C/3 and C/2 rate, 350 cycles), 24 Ω∗cm 2 SC-PCS-resistivity (900 cycles); 160 μm LCO | 500 s SC-PCS: 102 mAh/g (94.1% C.E., 1C, 350 cycles).

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Section: Nanostructure and Molecular Analysis: Formation Of Denuded Surfacementioning

confidence: 97%

Diffusion-Controlled Porous Crystalline Silicon Lithium Metal Batteries

et al. 2020

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Lateral Protein–Protein Interactions at Hydrophobic and Charged Surfaces as a Function of pH and Salt Concentration

2016

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Surface adsorption of Thermomyces lanuginosus lipase (TLL)-a widely used industrial biocatalyst-is studied experimentally and theoretically at different pH and salt concentrations. The maximum achievable surface coverage on a hydrophobic surface occurs around the protein isoelectric point and adsorption is reduced when either increasing or decreasing pH, indicating that electrostatic protein-protein interactions in the adsorbed layer play an important role. Using Metropolis Monte Carlo (MC) simulations, where proteins are coarse grained to the amino acid level, we estimate the protein isoelectric point in the vicinity of charged surfaces as well as the lateral osmotic pressure in the adsorbed monolayer. Good agreement with available experimental data is achieved and we further make predictions of the protein orientation at hydrophobic and charged surfaces. Finally, we present a perturbation theory for predicting shifts in the protein isoelectric point due to close proximity to charged surfaces. Although this approximate model requires only single protein properties (mean charge and its variance), excellent agreement is found with MC simulations.

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Surface-Functionalized Porous Silicon Wafers: Synthesis and Applications

Cited by 2 publications

References 40 publications

Diffusion-Controlled Porous Crystalline Silicon Lithium Metal Batteries

Diffusion-Controlled Porous Crystalline Silicon Lithium Metal Batteries

Lateral Protein–Protein Interactions at Hydrophobic and Charged Surfaces as a Function of pH and Salt Concentration

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