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- Nachgewiesen in: USPTO Patent Grants
- Sprachen: English
- Patent Number: 10260,154
- Publication Date: April 16, 2019
- Appl. No: 15/224701
- Application Filed: August 01, 2016
- Claim: 1. A method of synthesizing quantum dots, the method comprising: providing an electrochemical cell comprising an anode, a cathode, and an electrolytic solution, wherein the anode and the cathode are formed from a dichalcogenide material; and applying an electric potential between the anode and the cathode for a suitable period to form quantum dots in the electrolytic solution.
- Claim: 2. The method of claim 1 , wherein the dichalcogenide has a general formula MX 2 , wherein M is selected from a group consisting of one or more group VI metals, and X is a chalcogen selected from a group consisting of S, Se, Te or Po.
- Claim: 3. The method claim 2 , wherein M is selected from the group consisting of Mo or W.
- Claim: 4. The method of claim 1 , wherein the electrolyte solution comprises 1-butyl-3-methylimidazoliumchloride ([BMIm]Cl), 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl), or lithium bis(trifluoromethylsulphonyl)imide (LiTFSI), lithium perchlorate (LiClO 4), sodium perchlorate (NaClO 4), lithium hexafluoro arsenate (LiAsF 6), quarternary phosphonium salts or a combination thereof.
- Claim: 5. The method of claim 1 , further comprising separating the quantum dots from the electrolyte solution.
- Claim: 6. The method of claim 1 , wherein the quantum dots have a diameter of about 0.5 nm to about 10 nm.
- Claim: 7. The method of claim 1 , wherein the concentration of the electrolyte solution is about 0.1 weight percent to about 5 weight percent.
- Claim: 8. The method of claim 1 , wherein the quantum dots obtained is a monolayered nanosheets, multi-layered nanosheets, mono-layered nanoclusters, multi-layered nanoclusters or combinations thereof.
- Claim: 9. The method of claim 1 , wherein the electric potential applied is less than 5V for about 0.5 hour to about 5 hours.
- Claim: 10. The method of claim 1 , wherein the quantum dots exhibit excitation dependent luminescence.
- Claim: 11. A method of synthesizing quantum dots, the method comprising: providing an electrochemical cell comprising an anode, a cathode, and an electrolytic solution, wherein the anode is formed from a dichalcogenide material and the cathode is formed from a conducting substrate; and applying an electric potential between the anode and the cathode for a suitable period to form deposition of quantum dots on the electrode.
- Claim: 12. The method of claim 11 , wherein the dichalcogenide has a general formula MX 2 , wherein M is selected from a group consisting of one or more group VI metals, and X is a chalcogen selected from a group consisting of S, Se, Te or Po.
- Claim: 13. The method of claim 11 , wherein the conducting substrate is selected from the group consisting of gold, fluorine doped tin oxide (FTO), indium doped tin oxide (ITO), carbon nanotube, graphene film, conducting polymer films, and combinations thereof.
- Claim: 14. The method of claim 11 , wherein the electrolyte solution comprises 1-butyl-3-methylimidazoliumchloride ([BMIm]Cl), 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl), or lithium bis(trifluoromethylsulphonyl)imide(LiTFSI), lithium perchlorate (LiClO 4), sodium perchlorate (NaClO 4), lithium hexafluoro arsenate (LiAsF 6), quarternary phosphonium salts or a combination thereof.
- Claim: 15. The method of claim 11 , wherein the concentration of the electrolyte solution is about 0.1 weight percent to about 5 weight percent.
- Claim: 16. The method of claim 11 , further comprising deposition of Lithium ions on the electrode to form Lithiated dichalcogenides.
- Claim: 17. A nanocluster of luminiscent dichalcogenides particles having a general formula MX 2 , wherein M is selected from the group consisting of Mo and W, and X is selected from the group consisting of S or Se, and particle size of less than 10 nm.
- Claim: 18. The nanocluster of claim 17 , wherein the nanocluster comprises one or more layers.
- Patent References Cited: 9309124 April 2016 Loh ; 9954188 April 2018 Kumar ; 2013/0102084 April 2013 Loh ; 2015/0380665 December 2015 Kumar ; 2018/0186645 July 2018 Xu ; 2018/0190913 July 2018 Kumar ; WO2011162727 January 2011 ; WO2014132183 June 2014 ; WO2017000731 May 2017
- Other References: Pradhan, N. R. et al., Intrinsic carrier mobility of multi-layered MoS2 field-effect transistors on SiO. Applied Physics Letters 2013, 102, 123105. cited by applicant ; Eda, G. et al., Photoluminescence from Chemically Exfoliated MoS2. Nano Letters 2011, 11, 5111-5116. cited by applicant ; Hernandez, Y. et al., High-yield production of graphene by liquid-phase exfoliation of graphite. Nature Nanotechnology 2008, 3, 563-568. cited by applicant ; Coleman, J. N et al., Two-Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials. Science 2011, 331, 568. cited by applicant
- Primary Examiner: Kiliman, Leszek B
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