One-step process for synthesis of core shell nanocrystals
Present invention provides a process for the synthesis of size and composition tunable colloidal PbMgS core and PbMgS/MS core shell quantum dots emitting in the near infrared (NIR) region of the spectrum in a single operation in a continuous flow reactor. M includes at least one of Cd, Mg, Zn and Cu metals.
1. A composition, comprising:
a nanostructure; and
a surfactant bound to a surface of the nanostructure, the surfactant including an oil-dispersible polymer containing a functional group, wherein the oil-dispersible polymer includes polyethylene-co-acrylic acid (PECA),
wherein the nanostructure includes a core shell quantum dot with Pb x Mg 1-x S core and a semiconductor shell comprising MS, M being metal and selected from the group consisting of Mg, Cd, Zn and Cu and a combination thereof, where x value is between 0.7 and 0.95.
2. The composition of claim 1 , wherein x value is between 0.75 and 0.95.
3. The composition of claim 1 , wherein MS includes one of CdZnS and CdMgS.
4. The composition of claim 1 , wherein the core quantum dot photoluminesces with a quantum efficiency of about 10%-50%.
5. The composition of claim 1 , wherein the core shell quantum dot photoluminesces with a quantum efficiency of at least about 40%-80%.
6. The composition of claim 1 , wherein the composition is dispersible in an oil-based solvent.
7. The composition of claim 6 , wherein the surfactant is a solvent selective surfactant enabling the core shell quantum dot to homogeneously disperse within the oil-based solvent.
8. The composition of claim 7 , wherein the surfactant includes oleic acid.
9. The composition of claim 7 , wherein the surfactant includes at least one of oleic acid, dodecanethiol, trioctylphospine, and trioctylphosphineoxide.
10. The composition of claim 1 , wherein the quantum dot fluoresces with an emission maximum in the range of 700-1400 nm.
11. The composition of claim 6 , wherein the oil-based solvent includes gasoline, diesel, octadecene, toluene, hexane, trichloroethylene, tetrachloroethylene, engine oil.
12. A composition, comprising:
a nanostructure; and
a surfactant bound to a surface of the nanostructure, the surfactant including an oil-dispersible polymer containing a functional group, wherein the oil-dispersible polymer includes polyethylene-co-methacrylic acid,
wherein the nanostructure includes a core shell quantum dot with Pb x Mg 1-x S core and a semiconductor shell comprising MS, M being metal and selected from the group consisting of Mg, Cd, Zn and Cu and a combination thereof, where x value is between 0.7 and 0.95.
13. The composition of claim 12 , wherein x value is between 0.75 and 0.95.
14. The composition of claim 12 , wherein MS includes one of CdZnS and CdMgS.
15. The composition of claim 12 , wherein the core quantum dot photoluminesces with a quantum efficiency of about 10%-50%.
16. The composition of claim 12 , wherein the core shell quantum dot photoluminesces with a quantum efficiency of at least about 40%-80%.
17. The composition of claim 12 , wherein the composition is dispersible in an oil-based solvent.
18. The composition of claim 17 , wherein the surfactant is a solvent selective surfactant enabling the core shell quantum dot to homogeneously disperse within the oil-based solvent.
19. The composition of claim 18 , wherein the surfactant includes oleic acid.
20. The composition of claim 18 , wherein the surfactant includes at least one of oleic acid, dodecanethiol, trioctylphospine, and trioctylphosphineoxide.
21. The composition of claim 12 , wherein the quantum dot fluoresces with an emission maximum in the range of 700-1400 nm.
22. The composition of claim 17 , wherein the oil-based solvent includes gasoline, diesel, octadecene, toluene, hexane, trichloroethylene, tetrachloroethylene, engine oil.