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Mécanisme de synthèse et de formation respectueux de l'environnement de nanofils de cuivre à rapports d'aspect contrôlés à partir de solutions aqueuses avec de l'acide ascorbique.

Des nanofils de cuivre (Cu) ont été synthétisés par réduction des complexes de chlorure de cuivre en utilisant de l’acide ascorbique (AA) comme agent réducteur doux, de la polyvinylpyrrolidone (PVP) comme agent de coiffage et du NaCl comme additif dans des conditions atmosphériques. Des analyses de surface ont révélé que la synthèse de Cu NW était nécessaire pour les ions Cl et PVP. Ensemble, les ions Cl et PVP ont coiffé les faces latérales de Cu (100), conduisant à une croissance anisotrope de Cu NW le long de la direction [110]. Pour obtenir des NW de Cu avec des rapports de forme élevés, nous avons évalué le mécanisme de synthèse dans différentes conditions de réaction. Les résultats ont indiqué que la présence d'oxygène dissous (OD) était le facteur dominant ayant une incidence sur le rapport de longueur des Cu NW. L'OD et le peroxyde d'hydrogène résultant de la réaction entre l'OD et l'AA ont oxydé les surfaces des Cu NW en croissance, empêchant toute croissance ultérieure. La diminution de la quantité d'oxydes sur les surfaces de Cu NW et l'élimination de l'OD augmentaient les rapports d'aspect des Cu NW. Les résultats ont indiqué que l'OD doit être éliminé de la solution réactionnelle pour obtenir des Cu NW à rapport d'aspect élevé dans des solutions aqueuses contenant de l'AA.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30029029


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