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Elaboration Electrochimique et Caractérisations de Nanofils d'Antimoine et d'Or

Abstract : One-dimensional nanostructures attract a great deal of research interest because they allow both fundamental studies and potential applications. The aim of this work is to investigate the electrodeposited nanowires such as antimony (Sb) and gold (Au). By correlation of the synthesis conditions, growth morphology and crystal quality, we have successfully elaborated single crystalline nanowires using template method, i.e. both Sb and Au nanowires were deposited in the pores of a polycarbonate membrane with a diameter variation from 400 to 20 nm. Analysis of the electrochemical behaviors during deposition processing results in a preliminary comprehension of the electrodeposition mechanism for template nanowire preparation, which is related to a special diffusion layer thickness in the case of nano-deposition. Characterization of nano-scaled structures requires specific techniques, particularly in high resolution. Therefore, SEM-FEG, HRTEM, EXDS-TEM, EELS-STEM-FEG as well as AFM have been used in this work for both the growth morphology investigation and the chemical composition determination of the electrodeposited Sb and Au nanowires. Finally, field emission properties of the free-standing Au nanowires have been measured in order to fabricated field emission displays (FEDs). A threshold field (Ethr) equal to 3,2 V/µm (for an emission current density of 10 mA/cm2) was deduced. This value is comparable to that obtained with carbon nanotubes.
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Emmanuel Roy. Elaboration Electrochimique et Caractérisations de Nanofils d'Antimoine et d'Or. Physique [physics]. Université de Marne la Vallée, 2002. Français. ⟨tel-00351667⟩

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