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Macroporous Silicon (macroporou + silicon)

Distribution by Scientific Domains
Physics and Astronomy60%

Selected Abstracts

Reversible Storage of Lithium in Silver-Coated Three-Dimensional Macroporous Silicon,

ADVANCED MATERIALS, Issue 20 2010
Yan Yu
Three-dimensional macroporous silicon (see image) was synthesized by a magnesiothermic reduction method as an anode material for lithium ion batteries. An improved lithium storage performance was obtained after coating silver nanoparticles on the surface of the silicon. The silver-coated 3D macroporous silicon shows promise as an anode material in lithium ion batteries. [source]

Integration of Erbium-Doped Lithium Niobate Microtubes into Ordered Macroporous Silicon,

ADVANCED MATERIALS, Issue 3 2006
L. Zhao
Er3+ -doped LiNbO3 microtubes have been prepared by the infiltration of ordered macroporous silicon with Er:LiNbO3 melts (see Figure). The microtubes consist of single-crystalline segments and exhibit the characteristic photoluminescence of Er3+, which coincides with the transmittance maximum of silica-based optical components. [source]

Reduced pore diameter fluctuations of macroporous silicon fabricated from neutron-transmutation-doped material

PHYSICA STATUS SOLIDI - RAPID RESEARCH LETTERS, Issue 7 2010
Stefan L. Schweizer
Abstract The precision of photo-electrochemical etching of perfectly-ordered macropores in single-crystalline silicon is limited by pore diameter fluctuations due to doping variations of the starting wafer (striations). The doping variation originates from the rotation during crystal growth in the float-zone or Czochralski process, respectively. Experimentally, variations of the pore diameter up to 7% can occur. These so-called striations limit performance of possible applications of macroporous silicon. As doping inhomogeneities are the reason for the striations, uniformly doped silicon wafers by neutron transmutation doping were used for the first time. Photoelectrochemical etching of neutron transmutated silicon has been carried out and the pore diameter fluctuation has been reduced by about 40% compared to standard doped float-zone wafers. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Enhanced control of porous silicon morphology from macropore to mesopore formation

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 8 2005
Huimin Ouyang
Abstract Porous silicon (PSi) is a versatile material that possesses a wide range of morphologies. There are two main types of microstructures that are widely used and well studied: branchy mesoporous silicon with pore sizes from 10 nm to 50 nm and classical macroporous silicon with pore sizes from 500 nm to 20 µm. Much less work has been done on structures with intermediate pore sizes from 100 nm to 300 nm. Applications such as immunoassays biosensing can greatly benefit from the intermediate morphology due to the larger pore openings compared to mesopores, and increased internal surface compared to classical macropores. In this work we demonstrate well-defined macropore of 150 nm diameter in average and precise control of the porous silicon morphology transition from smooth macropores to branchy mesopores on one substrate with one electrolyte. A multilayer structure (microcavity) consisting of both mesopores and macropores is presented. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]