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clfu2000木虫 (著名写手)
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一篇有关纳米结构拉曼谱图分析的新作
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Raman Spectroscopy of Nanomaterials: How Spectra Relate to Disorder, Particle Size and Mechanical Properties Progress in Crystal Growth & Characterization of Materials 2007 Gwénaël GOUADEC and Philippe COLOMBAN Laboratoire de Dynamique, Interactions et Réactivité (LADIR), UMR7075 - CNRS & Université Pierre et Marie Curie - Paris 6, 2 rue Henry Dunant, 94320 Thiais, France ABSTRACT The purpose of this review is to provide non-specialists with a basic understanding of the information micro-Raman Spectroscopy (μRS) may yield when this characterization tool is applied to nanomaterials, a generic term for describing nano-sized crystals and bulk homogeneous materials with a structural disorder at the nanoscale - typically nanoceramics, nanocomposites, glassy materials and relaxor ferroelectrics. The selected materials include advanced and ancient ceramics, semiconductors and polymers developed in the form of dots, wires, films, fibres or composites for applications in the energy, electronic and aeronauticsaerospace industries. Following a short introduction, the text is divided into four sections: • The 1st section outlines the principles of conventional μRS. • The 2nd section introduces the main effects for nanomaterials, with special emphasis on two models that connect Raman spectra features to "grain size", namely the Phonon Confinement Model (PCM) and the Elastic Sphere Model (ESM). • The 3rd section presents the experimental versatility of μRS applied to nanomaterials (phase identification, phase transition monitoring, grain size determination, defect concentration assessment, etc.). • The 4th section deals with the micro-mechanical aspects of μRS ("Raman extensometry"  .Special emphasis is placed on the relationship between the stress-related coefficients Sε/σ and the macroscopic response of the materials to the applied stress. PACS: 63.20.-e; 63.50.+x; 78.30.-j; 81.40.Jj; 81.05.Ys Keywords: A1 Raman Spectroscopy; A1 disorder; A1 stress; B1 nanomaterials; B1 nanotubes; B1 oxides; B2 Semiconductors; B2 carbon; B2 glass [ Last edited by luo.henry on 2008-4-25 at 15:00 ] |
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