Quantum dot synthesis
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Uploaded by wli224 on Aug 15, 2006
If you'll excuse the ridculously overdramatic soundtrack :) Synthesis of CdSe nanocrystals by injection of cadmium and selenium precursors into a high boiling point coordinating solvent at 360 degrees C. ~3nm particles of CdSe are initially generated. The intense color results from the quantum confinement effect on the electron as a result of the nanocrystal size being less than the Bohr radius of the exciton. Thus, as the particles grow larger, they become redder in color. A size series was generated by allowing the crystals to grow at 280C over a period of ~2 minutes. The visible spectrum from 515nm (green) to 650nm (red) was covered.
Uploader Comments (wli224)
Top Comments
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requiem for a synthesis
2 years ago 18
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The overdramatic music was good.
3 years ago 7
All Comments (66)
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sir can you send me the exact precursors you used and experimental conditions maintained during synthesis of these QD ...my mail id is ashishnirban@gmail.com...i need them for my project
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That clock is a lab classic.
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Impressive, and now I want to go take Rainbow Shots.
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The problem is, these HORDES of Asians that MIT let let our school every year, which is fine, but if you're going to come to MIT, then use AMERICAN MANNERS!
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Great, but how can we make them at home?!?!
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so what's the point of removing the reaction solution at regular interval? to study the size distribution?
but in the end you will use the final product which is a dark red solution right?
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woalla, a colde fusion. hehehehehe.
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Epic
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what happens if u mix them all together...?
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Oh and by the way, there is no such qdots smaller in diameter than the bohr radius of an electron. The bohr radius(a0) is defined as the smaller radius accesible to an electron in the ground state of the hydrogen atom. You sure you guys are from M.I.T ?
quantumdude 4 years ago
That's correct quantumdude. But as you probably already know, what is meant in the description is that the QDs are smaller than the Bohr radius of the exciton, or the electron-hole pair generated upon photoexcitation. Colloidal QDs have a size distribution of a few %, and the benefits are solution processability which are useful for a number of applications such as in biology.
wli224 4 years ago 4
what music is this? i love this music and i've been trying to figure out what it is.
illegal0immigrant 4 years ago
The soundtrack is from Lord of the Rings :)
wli224 4 years ago
Huh ? I thought it was from Requiem for a dream !
quantumdude 4 years ago
The original track is called Lux Aeterna from the Requiem soundtrack, but the version in the video was the re-orchestrated version used in the trailer of LOTR:Two Towers
wli224 4 years ago