Gesetzt Synthese von CdSe / CdS-Nanokristalle Rod und Tetrapod

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Manthiram, K., Beberwyck, B. J., Talapin, D. V., Alivisatos, A. P. Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals. J. Vis. Exp. (82), e50731, doi:10.3791/50731 (2013).

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Wir zeigen, ein Verfahren zur Synthese von Mehrkomponenten-Nanostrukturen, bestehend aus CdS und CdSe mit Stab und tetrapod Morphologien. Ein ausgesät Synthesestrategie eingesetzt wird, bei dem kugelförmige Samen von CdSe zunächst mit einem Heißinjektionstechnik hergestellt. Durch Steuern der Kristallstruktur des Samens entweder Wurtzit-oder Zinkblende, die anschließende Heißinjektions Wachstum von CdS aus den Samen führt entweder zu einem stabförmigen oder tetrapodförmigen Nanokristall betragen. Die Phase und Morphologie der Nanokristalle werden durch Röntgenbeugung und Transmissionselektronenmikroskopie bestätigt, die zeigen, dass die Nanokristalle sind phasenrein und haben eine einheitliche Morphologie. Der Extinktionskoeffizient und die Quantenausbeute der Nanokristalle werden mit UV-VIS-Absorptionsspektroskopie und Photolumineszenz-Spektroskopie ermittelt. Die Stäbe und tetrapods Ausstellungs Extinktionskoeffizienten und Quantenausbeuten, die höher ist als die der bloßen sindSamen. Dieses Verfahren zeigt die genaue Anordnung der Materialien, die im Nanometerbereich durch Verwendung einer geimpften Syntheseverfahren erreicht werden können.


Name Company Catalog Number Comments
Sodium hydroxide, 98% Fisher BP359
Myristic acid, 99% Sigma Aldrich M3128
Methanol, 99.8% Fisher A412
Cadmium nitrate tetrahydrate, 99% Sigma Aldrich 20911 Highly toxic
Cadmium oxide (CdO), 99.99% Sigma Aldrich 202894 Highly toxic
1-Octadecene (ODE), 90% Sigma Aldrich O806 Technical grade
Selenium (Se), 100 mesh, 99.99% Sigma Aldrich 229865
Tri-n-octylphosphine (TOP), 97% Strem 15-6655 Air sensitive
Sulfur (S), 99.9995% Alfa Aesar 10343
Trioctylphosphine oxide (TOPO), 99% Strem 15-6661
N-Octadecylphosphonic acid (ODPA), 99% PCI Synthesis 104224
Methanol, anhydrous, 99.8% Sigma Aldrich 322415
Toluene, anhydrous, 99.8% Sigma Aldrich 244511
Chloroform, anhydrous, 99% Sigma Aldrich 288306
Acetone, 99.9% Fisher A949 Dried over 4Å sieves
Hexane, anhydrous, 95% Sigma Aldrich 296090
2-Propanol, anhydrous, 99.5% Sigma Aldrich 278475
Selenium dioxide, 99.999% Sigma Aldrich 204315
Oleic acid, 90% Sigma Aldrich 364525 Technical grade
Oleylamine, 70% Sigma Aldrich O7805 Technical grade
Propylphosphonic acid (PPA), 95% Sigma Aldrich 305685
Ethanol, anhydrous, 99.5% Sigma Aldrich 459836
Octylamine, 99% Sigma Aldrich O5802



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