Documents disponibles écrits par cet auteur

A rapid hot-injection method for the improved hydrothermal synthesis of CdSe nanoparticles / Juandria V. Williams in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4316–4321 Titre : A rapid hot-injection method for the improved hydrothermal synthesis of CdSe nanoparticles Type de document : texte imprimé Auteurs : Juandria V. Williams, Auteur ; Nicholas A. Kotov, Auteur ; Phillip E. Savage, Auteur Année de publication : 2009 Article en page(s) : pp. 4316–4321 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cadmium  selenide  Hot-injection  method  Organic  solvents Résumé : Cadmium selenide (CdSe) quantum dots were prepared in high-temperature water via a rapid hot-injection method intended to mimic conventional synthesis in organic solvents. The nanocrystals were smaller than those previously produced hydrothermally under nonisothermal conditions when using the same process parameters. It is possible that the nucleation and growth events were greatly influenced by the present injection method. In general, the physical and optical properties of the nanocrystals were influenced by the experimental conditions. Variations in reaction temperature (200−240 °C), reaction time (1−10 min), pH (7−11), Cd:Se molar ratio (4:1−40:1) and Cd:stabilizer molar ratio (0.24−1.18) affected the mean particle size, distribution of sizes, and quantum yield. As-prepared nanoparticles exhibited quantum yields in excess of 5%. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007067 [article] A rapid hot-injection method for the improved hydrothermal synthesis of CdSe nanoparticles [texte imprimé] / Juandria V. Williams, Auteur ; Nicholas A. Kotov, Auteur ; Phillip E. Savage, Auteur . - 2009 . - pp. 4316–4321. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4316–4321 Mots-clés : Cadmium  selenide  Hot-injection  method  Organic  solvents Résumé : Cadmium selenide (CdSe) quantum dots were prepared in high-temperature water via a rapid hot-injection method intended to mimic conventional synthesis in organic solvents. The nanocrystals were smaller than those previously produced hydrothermally under nonisothermal conditions when using the same process parameters. It is possible that the nucleation and growth events were greatly influenced by the present injection method. In general, the physical and optical properties of the nanocrystals were influenced by the experimental conditions. Variations in reaction temperature (200−240 °C), reaction time (1−10 min), pH (7−11), Cd:Se molar ratio (4:1−40:1) and Cd:stabilizer molar ratio (0.24−1.18) affected the mean particle size, distribution of sizes, and quantum yield. As-prepared nanoparticles exhibited quantum yields in excess of 5%. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007067