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We use metal-assisted chemical etching (MCE) method to fabricate nanostructured black silicon on the surface of C-Si. The Si-PIN photoelectronic detector based on this type of black silicon shows excellent device performance with a responsivity of 0.57 A/W at 1060 nm. Silicon nanocone arrays can be created using MCE treatment. These modified surfaces show higher light absorptance in the near-infrared range (800 to 2500 nm) compared to that of C-Si with polished surfaces, and the variations in the absorption spectra of the nanostructured black silicon with different etching processes are obtained. The maximum light absorptance increases significantly up to 95 % in the wavelength range of 400 to 2500 nm. Our recent novel results clearly indicate that nanostructured black silicon made by MCE has potential application in near-infrared photoelectronic detectors. [ABSTRACT FROM AUTHOR]

In this study, silicon oxycarbide (SiOC) ceramic fiber mats obtained by electrospinning of two different preceramic polymers (MK and H44 resin) were evaluated in terms of their total porosity and other structural characteristics using three different characterization tools. The tensile strength and the permeability of the fiber mats were also investigated. The results indicated that the porosity could be easily calculated based on the apparent density and true density of the fiber mats obtained by gas pycnometry. A modified mercury intrusion porosimetry, in which the bulk volume of the fiber mats was calculated based on its independently measured bulk density, also allowed for an accurate evaluation of the porosity and the pore size distribution of the fiber mats. X-ray computed tomography was able to provide various structural characteristics of the 3D morphology of the fiber mats, but it was less effective in the determination of the total porosity due to resolution limits. All results showed that the MK-derived SiOC fiber mats possessed a higher porosity than the H44-derived SiOC fiber mats, resulting in a higher gas permeability. The ceramic fiber mats possessed a suitable permeability for filtration applications in harsh environments. [ABSTRACT FROM AUTHOR]

Various electrospun metal/SiOC (Ag/SiOC, Co/SiOC, and Cu/SiOC) composite fibers were synthesized via a carbon thermal reduction of four kinds of metal source (silver oxide nanoparticles, silver acetate, cobalt acetate, and copper trifluoro acetylacetonate). XRD results indicate that both common metal-organic metal precursors and seldom used metal oxide particles were successfully carbon thermally reduced to the corresponding metallic particles embedded in SiOC fibers, indicating that the range of metal source choices suitable for this method is quite broad. Further SEM and TEM analysis revealed that the shape and size of the formed metal particles were determined by the characteristics of the metal source in the electrospinning solution, which means these features of the metal particles can be adjusted by taking into account the solubility of the precursors in the chosen solvents. The prepared Ag/SiOC composite fibers possessed antibacterial activity for both Gram-negative E. coli bacteria and Gram-positive S. aureus bacteria and suitable permeability (~1 × 10 m), constituting a promising material for antibacterial filtration application. [ABSTRACT FROM AUTHOR]