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Biodegradable Porous Silicon Barcode Nanowires with Defined Geometry
Author(s) -
Chiappini Ciro,
Liu Xuewu,
Fakhoury Jean Raymond,
Ferrari Mauro
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201000360
Subject(s) - materials science , porous silicon , nanowire , silicon , nanotechnology , photoluminescence , nanolithography , monocrystalline silicon , porosity , porous medium , optoelectronics , composite material , fabrication , medicine , alternative medicine , pathology
Silicon nanowires are of proven importance in such diverse fields as energy production and storage, flexible electronics, and biomedicine due to the unique characteristics that emerge from their 1D semiconducting nature and their mechanical properties. Here, the synthesis of biodegradable porous silicon barcode nanowires by metal‐assisted electroless etching of single‐crystal silicon with resistivities ranging from 0.0008 to 10 Ω cm is reported. The geometry of the barcode nanowires is defined by nanolithography and their multicolor reflectance and photoluminescence is characterized. Phase diagrams are developed for the different nanostructures obtained as a function of metal catalyst, H 2 O 2 concentration, ethanol concentration, and silicon resistivity, and a mechanism that explains these observations is proposed. These nanowires are biodegradable, and their degradation time can be modulated by surface treatments.