Name: gold nanostar synthesis with a silver seed mediated growth method
Uploaded: 2012-01-15T14:00:00
Description: Watch this Scientific Journal Video about Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method at JoVE.com

Cette recherche a été financée par le Partenariat National Science Foundation pour la recherche et l&#39;éducation dans les Matériaux (PREM) Grant No. DMR-0934218. Il a également été soutenue par le Prix Nombre 2G12RR013646-11 du National Center for Research Resources. Le contenu est exclusivement la responsabilité de leurs auteurs et ne représentent pas nécessairement les vues officielles du Centre National des Ressources de la recherche ou le National Institutes of Health.

1. La préparation des graines d&#39;Argent <ol><li> Préparer une solution stock de nitrate d&#39;argent (AgNO 3) en prenant une masse arbitraire et le mélanger avec 10 ml d&#39;eau désionisée (DI). Calculer la molarité de la solution. Conserver la solution dans un endroit sombre à l&#39;isoler de la lumière. </li><li> Ajouter 14,7 mg de citrate de sodium tribasique (Na 3 C 6 H 5 O 7) à 10 ml d&#39;eau DI pour faire une solution à 5 mM. Agiter le flacon j...

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Dans ce travail nous avons présenté une méthode pour synthétiser nanostars or en utilisant des semences d&#39;argent. Nous avons constaté que les graines d&#39;argent conduit à un rendement de production de 70% des nanostars. Le nanostars avoir un pic d&#39;absorption dans le proche infrarouge, ce qui correspond à leur mode de résonance plasmonique de surface, centrée entre 800 nm et 850 nm 7, 23. Ces propriétés permettent à nos propriétés nanostars d&#39;or pour être d&#39;utilisation pour des...

<table border="1"><tbody><tr><td> Nom du réactif </td><td> Société </td><td> Numéro de catalogue </td><td> Pureté </td></tr><tr><td> Le citrate de sodium tribasique déshydratent </td><td> Sigma </td><td> S4641 </td><td> 99,0% </td></tr><tr><td> Le nitrate d&#39;argent </td><td> Aldrich </td><td> 204390 </td><td> 99,9999% </td></tr><tr><td> Le borohydrure de sodium </td><td> Aldrich </td><td> 213462 </td><td> 99% </td></tr><tr><td> Acide L-ascorbique </td><td> Sigma-Aldrich </td><td> 255564 </td><td> 99% + </td></tr><tr><td> Trihydrate de chlorure d&#39;or </td><td> Aldrich </td><td> 520918 </td><td> + 99,9% </td></tr><tr><td> Bromure de Hexadecyltrimethylammonium (CTAB) </td><td> Sigma </td><td> H6269 </td><td></td></tr></tbody></table><table border="1"><tbody><tr><td> Nom de l&#39;équipement </td><td> Société </strong&gt; </td><td> Commentaires </td></tr><tr><td> JEOL 2010-F </td><td> JEOL </td><td> Microscope électronique à transmission </td></tr><tr><td> Hitachi S-5500 </td><td> Hitachi </td><td> Utilisé en mode balayage au microscope électronique </td></tr><tr><td> Olis Cary-14 spectrophotomètre </td><td> Olis </td><td> Spectrophotomètre </td></tr></tbody></table>

gold nanostar synthesis with a silver seed mediated growth method

Les propriétés physiques, chimiques et optiques des nano-échelle colloïdes dépendent de leur composition, la taille et la forme 1-5. Il ya un grand intérêt dans l&#39;utilisation de nano-colloïdes pour la photo-thermique d&#39;ablation, la livraison de médicaments et de nombreuses autres applications biomédicales 6. L&#39;or est particulièrement utilisé en raison de sa faible toxicité 7-9. Une propriété de métal nano-colloïdes est qu&#39;ils peuvent avoir une surface solide résonance plasmonique 10. Le pic du mode de résonance plasmonique de surface dépend de la structure et la composition du métal de nano-colloïdes. Depuis le mode de résonance plasmonique de surface est stimulé avec la lumière il ya un besoin d&#39;avoir l&#39;absorbance de pointe dans le proche infrarouge, où transmissivité tissu biologique est maximale 11, 12. Nous présentons une méthode pour synthétiser étoile d&#39;or en forme colloïdale, aussi connu comme les nanoparticules en forme d&#39;étoile ou de 13 à 15 nanostars 16. Cette méthode est basée sur leolution contenant des graines d&#39;argent qui sont utilisés comme agent de nucléation pour la croissance anisotrope des colloïdes d&#39;or 17-22. Microscopie électronique à balayage (MEB) de l&#39;or colloïdal résultant a montré que 70% des nanostructures ont été nanostars. L&#39;autre 30% des particules ont été amas amorphe de decahedra et rhomboïdes. Le pic d&#39;absorbance de l&#39;nanostars a été détectée pour être dans le proche infrarouge (840 nm). Ainsi, notre méthode produit nanostars d&#39;or conviennent pour des applications biomédicales, en particulier pour la photo-thermique d&#39;ablation.

Watch this Scientific Journal Video about Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method at JoVE.com

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

Nous avons synthétisé nanostars étoile d&#39;or en forme en utilisant une méthode de graines d&#39;argent médiation croissance. Le diamètre de la nanostars varie de 200 à 300 nm et le nombre de conseils varient de 7 à 10. Les nanoparticules ont une surface large résonance plasmonique de mode centré dans le proche infrarouge.

Or Nanostar synthèse avec une méthode de graines Silver croissance Mediated

The physical, chemical and optical properties of nano-scale colloids depend on their material composition, size and shape 1-5. There is a great interest ...

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