Lead Sulfide Quantum Dots Synthesis

Quantum dots are semiconductor nanocrystals on the scale of a few nanometers, or several hundred atoms. At this size quantum effects dominate and the electrons are quantum confined to narrow energy levels determined by the size of the particle. This means that the absorption wavelength the light can be fine-tuned and that quantum dots can be used to adjust the bandgap of the materials they are associated with. Quantum dots being explored for use in photovoltaics and in signal processing. This shows professional laboratory procedures for synthesizing quantum dots.
For more info see Photontics wiki
photonicswiki.org/index.php?ti...

[@chsor4]

Be advised that the sulphur precursor they use is not HMDS, as noted. It is most likely Hexamethyldisilathiane. HMDS, used to prepare Si wafers for photoresist, does not contain any sulphur.

[@christopherleubner6633]

12 years ago. PbS and PbSe would have very strong resonance in the reddish orange to near IR bands. (580 to about 2000nm wavelengths) Also they would be reasonably air stable as well.❤

[@eitan166]

Very good and instructive video, thank you!

[@annsome]

Great info! Btw, Ashley is a doctor now and working in the university of Oxford.

[@thanawitsagulthang6471]

I have been looking for this for a long time

[@BRYDN_NATHAN]

Thank you. Excellent experiment 👍

[@mrgerlo]

Hi there, in the introduction part, when Ashley is describing the ingredients, she says add 1.4g of Oleic Acid, then explains that is kept in the fridge for preservation and then says, we add 1.2g of that. Can you please add a note with the correct amount?? thanks!

[@adrienyepseu7798]

Hi, very good video

[@XainZ14]

Hello everyone, very precise and nice video; I just have one question what kind of plugs are used in this synthesis method for thermocouple and precursor injection as I am having issue of oxidation in similar method and using silicone caps????? Hoping to hear reply soon.

[@AnkitaSingh-bh4zj]

Can you suggest a procedure for MoSe2 nanoparticles and if the synthesis is possible without a glovebox?? Thank you

[@jemaiisafa6299]

is there a publication on this? Please i need it as a reference

[@user-nc4bc9hc5v]

6:45 there's no sulfur in hexylmethyldisilazane, but how does it become PbS when reacted with Pb precursor? seems like confused with hexamethyldisilathiane FYI

[@rijuwanahaque8054]

For how much time I have to centrifuge it??

[@ghulamfareed7890]

What is sulphure source?

[@marianapomohaci6080]

Is this the mark of the beast in Revelation?? Those who receive the mark of the beast are dammed forever.

[@christopherleubner6633]

Naw just mini crystals of lead sulfide that are so small they act like antennas for light.😁🤓

[@christopherleubner6633]

No, it is simply a method of making florescent crystals with a very precise emission band. Can use almost anything to make these so long as it have a discrete band gap of voltage, for example GaN would make UV to green, PbSe would glow in the near infrared, this version would glow mostly yellow-orange at the particle size chosen.❤