How to Make Quantum Dots

Charli Dvoracek, a graduate student in Peter Searson's lab at the Johns Hopkins Institute for NanoBioTechnology (INBT) shows us how to make Cadmium Selenide semiconductor nanocrystals, which are better known as quantum dots. These nanoparticles could be used in a wide range of products from cancer tests to solar cells.

[@LM-gi2ks]

Really informative. Thank you. Several companies are now making commercial quantum dots. Besides using dot size to modify the emission wavelength, it's also possible to tune the output wavelength using a composition gradient in the core material.

[@niujunking]

thank you soooo much!

[@brentonpiercy]

Rad. Thanks for posting.

[@hi92354]

Very nice presentation.

[@FoodNerds]

This was very interesting 🧐 thank you!

[@learneverything9271]

Thanks a lot for sharing

[@savijay100]

Excellent!! lecture about the CdSe Dot. I wish all success in your future endeavors.

[@LordMegatherium]

I actually made CdSe QD synthesis optimization as a project yet with the TOP/TOPO method. Also made multishells. Thing is I didn't have to evacuate the vessel that long. The basic synthesis is really this easy though time-consuming due to the purification steps if you're doing multshells. Too bad I didn't have time to do biofunctionalization.

[@rickmurie5861]

Amazing!

[@samuelwamwere4867]

Nice work

[@HiAdrian]

Interesting, thanks.

[@novis1atgmail]

@espydude Typically Quantum dots are very useful for research purposes. Its hard to get enough dots to the cancer cells in a living person to be visible, and they can potentially have harmful effects. There is some research to try to do this, but for the most part dots are a research tool currently.

[@TheEric826]

she did great explaining that to the normal person

[@AbuShabab]

Thanks Charli! I understand you use CdSe quantum dots to bind with and to identify cancerous cells.
I would like to learn the process of assembling quantum dots with mesoscopic TiO2 nanoparticle films for harvesting light and improving photon to charge carrier generation in solar cells.
Could you provide me any pointers like video links or online information. Thanks!

[@deeplearningpartnership]

Very interesting.

[@godzilla1922]

After you created your QD cores, what type of organic solvents did you use to wash them?

[@lvb3575]

Can you guys perhaps make a video on how to make Carbon quantum dots?

[@minototta6702]

You are more beatifull than the science you explain.....!!!!

[@OfficeThug]

Man, I could probably make this stuff in my own lab. We have 2 gloveboxes, 8 schlenk lines and about 10 different distillation columns. Unfortunately our group only works with organic flow-cell battery materials and super organic reducing agents. Our stuff is either lovely black, lovely goop, or extra-lovely tar like substance that spontaneously combusts in air.

[@user-bm4bl8zr2q]

Nice but please any precursor use

[@laveenamakhaik5329]

12 years later this won Nobel Prize

[@JoneNascimento]

I'm in love.

[@AnkitaSingh-bh4zj]

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

[@sheernabi468]

How to synthesis luminescent car bon dos from plint

[@HartleySan]

Cool.

[@knirefnel]

Plus mad ventriloquist skills

[@ishaqktktech4372]

I am BS student we write a review on PdS2 quantum dots. unfortunately we don't work in lab due to lake of time

[@vadymvolodko7252]

I'll use Inplix instructions to make it by myself.

[@oskar12]

@61324852 @61324852 More than likely you'd use the SILAR method for covering the QD with an epitaxial inorganic layer that has a wider bandgap (for coating CdSe you'd use something like CdS, ZnS) see Peng et al, 2003 Large-scale synthesis of nearly monodisperse CdSe/CdS core/shell nanocrystals using air-stable reagents via successive ion layer adsorption and reaction
As for who invented QDs, the modern incarnation of what she's working with is attributed to Bawandi and Murray ~ 1993

[@Muradsahar]

I need to write an introductory technical paper on quantum dots for uni assingment(history to present, 20 pages), can you recommend some good source with comprehensive explanation on the subject. Articles, rsearch papers, lectures or books?

[@Muradsahar]

I mean specific sources, I do not want to go into deeper resarch, as I am under time constraint.

[@sonicase]

hmm what's the advantage of quantum dot over a flourescent protein attached to an antibody

[@jameszhang9326]

Not that simple to answer. Depends on the bonding affinity+type and the specific region that you're trying to dye-mark.

[@luissapple1]

Is this actually the process to identity cancer cells? Or just a study lab? I'm wondering because it seems most of this could be optimized to provide a streamlined analysis of cancer cells.

[@Pooua]

I don't know how prevalent this method is today, but doctors have been able to identify cancer cells a long time before QD was invented.

[@JonathanFosdickNano]

I use carbon to make my quantum dots ;p

[@MultiTuLaLiT]

How size your quantum dot?

[@DrBlueGOAT]

Few nanometers

[@navaneeth_anand]

What is her name?

[@justaddh30]

@dubtafoo so your greatest achievement is calling people out on the internet with your proper grammar and punctuation? clearly you cared enough to comment. thanks for caring internet tough guy!

[@asbaDoce]

I stayed at the "mechanical stimulation" [2:13] part and just couldn't keep the pace from there but it sounds like a lot of fun...

[@6Diego1Diego9]

Did she come up with this process?

[@6Diego1Diego9]

@@jameszhang9326 no there is not james wtf

[@6Diego1Diego9]

@@jameszhang9326 do you think I'm an idiot James? what's your problem

[@justaddh30]

So
So
So
So I start every sentence with the word 'So'

[@hollya.g.86]

So what?

[@NoahFect]

This sounds like an episode from the "Things I Won't Work With" blog (which needs its own RUclips channel badly.)

[@JustinKoenigSilica]

No, all of these things aren't that bad. There are far worse chemicals out there. This is actually quite manageable.

[@AbeMoffat]

More of a promise than a look?

[@TheBrokenSaint]

@unchellmatt this! Oh god we are all in danger.

[@srivishnurendla4894]

I'm in love 😘😘😘

[@niclasbech]

@sonicase
proteins are biologically active, nanodots are not.
thats my understanding anyway

[@Technoguy3]

CdSe. Zomg.

[@asbaDoce]

I stayed at the "mechanical stimulation" part and just couldn't keep the pace from there.

[@sonec90]

2:19
You shake that up. Give it that mechanical stimulation.

[@voroignis]

She can mechanically stimulate me any time! HEY-OHHH!!

[@laithyono7617]

She can mechanically stimulate me anytime

[@azmanabdula]

out of time?

[@SuperBastardHead]

Why do so many americans overuse the word "So"? Cool gloves though, and I can see you're used to mechanical stimulation.

[@futureprogress]

Mechanical stimulation....

[@rakka1dude184]

3 jealous men.

[@nicksanders9148]

THE MARK OF THE BEAST IS COMING! JESUS LOVES YOU ALL AND SO DO I! PLEASE PRAY ABOUT IT!

[@recordingangelproductionsl5129]

666 mark of the beast! Read revelation 13:16-18

[@KillerXtreme]

She's had a lot of practice with that mechanical stimulation..

[@BigMTBrain]

@2:12 - OH, YEAH for mechanical stimulation.

[@iLuVRmC]

she could mechanically stimulate me

[@nucleochemist]

Using an instrument with gloves on??? Tsk! Tsk!

[@dave1y2000]

Nice presentation. Just ditch the lab coat next time;) Wrrrrawr!!!!

[@unchellmatt]

If she ever realizes just how adorable she is, the ease with which she could over throw civilization would be staggering. Geek chicks + handy with dangerous chemicals = SWEET JEEBUS, yes please!

[@marshalt]

Yawn. who cares?

[@likuidmotion]

I have no idea what she's talking about, but she's hot.