نتایج جستجو برای: mesoporous silicon
تعداد نتایج: 90178 فیلتر نتایج به سال:
In recent years, dye-sensitized solar cells (DSSCs) based on nanocrystalline mesoporous TiO2 films have attracted much attention as a potential low-cost alternative to single or polycrystalline p–n junction silicon solar cells. DSSCs can reach electrical energy conversion efficiencies ≈12% [154, 284]. The traditional mesoporous TiO2 electrode composed of the TiO2 nanoparticles offer insufficien...
Temperature-programmed desorption of pyridine, FTIR and multinuclear NMR spectroscopy and catalytic test reaction have been applied to investigate acid sites in mesoporous materials with silicon/aluminum ratios of 266 and 20 and in an amorphous aluminosilicate with nSi/nAl=5.4. The results obtained by these methods indicate the presence of weak Brønsted acid sites in the aluminosilicate samples...
A simple one-pot synthesis of well-defined PS-silazane nano-composites (polystyrene, PS) is described. In contrast to the, thus far, used two-step procedure ((1) assembly of a PS template bed and (2) careful filling of the voids between the PS spheres), which is restricted to macro structuring, we are able to simply mix the PS template and a commercially available silazane precursor HTT-1800 in...
Porous silicon (PS) can be used as a loading template in sensing or matrix to develop nanoparticle arrays. We present comprehensive study of PS morphology and optical properties before after the pore opening process, including determination thickness, size, density layers, its surface wettability, reflectivity. The samples were fabricated by electrochemical anodization monocrystalline wafer 5–2...
Mesoporous Co3O4 nanoplates were successfully prepared by the conversion of hexagonal β-Co(OH)2 nanoplates. TEM, HRTEM and N2 sorption analysis confirmed the facet crystal structure and inner mesoporous architecture. When applied as anode materials for lithium storage in lithium ion batteries, mesoporous Co3O4 nanocrystals delivered a high specific capacity. At 10 C current rate, as-prepared me...
in this research, mesoporous silica was applied as the host of corrosion inhibitor (molybdate). the loaded mesoporous silica was dispersed in an epoxy matrix. the composite was then coated on the mild steel plate. results showed that the corrosion resistance of the scratched epoxy/mesoporous silica loaded by molybdate was better than the one without molybdate or neat epoxy. on the other hand, e...
We have prepared multifunctional magnetic mesoporous Fe-CaSiO3 materials using triblock copolymer (P123) as a structure-directing agent. The effects of Fe substitution on the mesoporous structure, in vitro bioactivity, magnetic heating ability and drug delivery property of mesoporous CaSiO3 materials were investigated. Mesoporous Fe-CaSiO3 materials had similar mesoporous channels (5-6 nm) with...
Mesoporous ZnS-NiS composites are prepared via ion- exchange reactions using ZnS as the precursor. The prepared mesoporous ZnS-NiS composite materials have large surface areas (137.9 m(2) g(-1)) compared with the ZnS precursor. More importantly, the application of these mesoporous ZnS-NiS composites as nonenzymatic glucose sensors was successfully explored. Electrochemical sensors based on meso...
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