Porous Silicon Formation by Anodization

Porosity and thickness characterization of porous Si and oxidized porous Si layers – An ultraviolet–visible–mid infrared ellipsometry study

“…Electrolyte exhaustion is all the more visible when the sample is thick, which explains why this tendency is only observable between the N-09, N-10 and N-11 samples. As for surface porosity, its slight increase with anodization duration can mainly be explained by a pure chemical etching phenomenon of silicon by HF [34]. Concerning the evaluations of the oxidized porous samples, with the help of model M6, the different volumetric contents (Si, void and SiO 2 components) could be obtained, as shown in Fig.…”

“…The rise of average porosity with anodization duration was previously observed on both highly-doped p-and n-type silicon [31][32][33], (Handbook of Porous Silicon, pp. 11-22 [34]). This phenomenon is generally attributed to a diffusion-limited renewal of the electrolyte at the silicon/porous silicon interface during long-duration anodizations.…”

Hybrid luminescent porous silicon for efficient drug loading and release

“…This effect can be however mitigated by an increase of the pores size in the native pSi by playing with the electrochemical etching parameters in the fabrication of the porous silicon. 72 It is worth noting that the large loading capacity (attributed to electrostatic interaction) here measured in pSi-COOH sample (about 40%), has not ever seen even by the oxidation trapping 36 and other methodologies. 50 However, as shown above, pSi-COOH has not good optical stability in PBS in comparison with samples functionalized with PEG.…”

Plant-Derived Tandem Drug/Mesoporous Silicon Microcarrier Structures for Anti-Inflammatory Therapy

“…Such extracts were loaded into nanostructured pSi particles prepared by our previously optimized eco-friendly fabrication route from silicon accumulator plants. 14−16 Nanostructured pSi, typically prepared by anodization techniques, is an established drug delivery vehicle, 17,18 with broadly tunable porosities, 19 surface functionalities, 20 and resorptivity in vitro/in vivo. 21−23 Elemental pSi is utilized here rather than totally oxidized porous silica (SiO 2 ) platforms such as diatoms, 24,25 as pSi provides a relatively more tunable resorptive profile as well as greater photostability of the active therapeutic within the pores.…”

“…To address these challenges with polyphenolic-containing extracts, and to employ a nano/microscale drug carrier that is fabricated by a “green” route that avoids relatively toxic reagents, we have encapsulated ethanolic extracts of Equisetum arvense (horsetail, itself a Si accumulator plant) into porous silicon (pSi) microparticles to increase their bioavailability. Such extracts were loaded into nanostructured pSi particles prepared by our previously optimized eco-friendly fabrication route from silicon accumulator plants. − Nanostructured pSi, typically prepared by anodization techniques, is an established drug delivery vehicle, , with broadly tunable porosities, surface functionalities, and resorptivity in vitro/in vivo. − Elemental pSi is utilized here rather than totally oxidized porous silica (SiO 2 ) platforms such as diatoms, , as pSi provides a relatively more tunable resorptive profile as well as greater photostability of the active therapeutic within the pores . In this study, the potential utility of pSi microparticles derived from tabasheer (Concretio silicea bambusae) loaded with ethanolic leaf extracts of E.…”