Stress effects in meso‐porous silicon nanostructures

Lysenko, V.; Populaire, C.; Remaki, B.; Champagnon, B.; Artmann, H.; Barbier, D.

doi:10.1002/pssc.200461114

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…In order to investigate wetting phenomena, unperturbed porous silicon layers and porous silicon layers wetted by by 100% liquid solutions of isopropanol or ethanol 'were' characterised by Raman scattering. These two liquids have been chosen because of their excellent properties of the hydrophilic interaction with Si surface ensuring very efficient nano-pores filling [11,27]. We noted that porous silicon layer was closed in a small glass vial, in which a remarkable amount of liquid was added.…”

Section: Porous Silicon Wettingmentioning

confidence: 99%

Investigation of Strain and Wetting in Porous Silicon and Feasibility of an Optical Sensor for Chemical Monitoring

Ferrara¹,

Sirleto²

2012

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In this paper an experimental study of wetting phenomena in porous silicon by Raman scattering is reported and the feasibility of an optical sensor for chemical monitoring is addressed. First, a systematic study of strain effects in 'as formed porous silicon layers' of different porosity and thickness is described. Samples of greater thickness (20 µm) and higher porosity (70%) have been individuated as the best candidates for the observation of wetting phenomena. Then, an experimental investigation of wetting phenomena in PS layers by Raman scattering is reported. The experimental results prove a reversible blue-shift of PS Raman speak of wetted porous silicon layers by isopropanol or ethanol with respect to unperturbed layers. We ascribe the shift to a compressive stress due to the increased lattice mismatch between the porous silicon layer and the bulk silicon substrate in wetting conditions. Finally, the feasibility of an optical sensor for chemical monitoring, using an approach based on porous silicon wetting and Raman scattering measurements is discussed. We conclude that being the measured shift of Raman peak very small, this mechanism could be not useful 'as a transducer' for sensing application i.e. to monitor vapors and liquids in an environment.

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Section: Porous Silicon Wettingmentioning

confidence: 99%

Investigation of Strain and Wetting in Porous Silicon and Feasibility of an Optical Sensor for Chemical Monitoring

Ferrara¹,

Sirleto²

2012

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Electrocatalytic Activity of Platinum Nanoparticles Supported on Nanosilicon

et al. 2010

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Platinum (Pt) nanocatalysts were deposited on/inside of nanostructured silicon (nanoSi) matrix using physico‐chemical methods, i.e. E‐beam high vacuum Pt thin film and, respectively, chemically loaded Pt nanoparticles from hexachloroplatinic acid aqueous or alcoholic precursor solutions. High resolution morphological characterisations, completed by microstructural and compositional analyses have been performed to characterise the nanoSi catalyst support and to investigate the Pt thin film nanostructuration as well as the nanoparticle attachment and clustering processes, evidencing the controlling factors and conditions of the size, morphology and distribution. Furthermore, the experimental structures have been subjected to different electrochemical tests and it was revealed that significant improvement of the long term catalyst stability was achieved when the metal‐porous Si nanoassemblies is formed, which represents a step closer to the realisation of the monolithic integrated Si‐based microfabricated fuel cell.

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