The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2023
Filed:
Apr. 23, 2021
The Government of the United States of America, As Represented BY the Secretary of the Navy, Arlington, VA (US);
Janice E. Boercker, Fairfax, VA (US);
Sarah F. Brittman, Washington, DC (US);
Joseph G. Tischler, Alexandria, VA (US);
Patrick Y. Yee, Washington, DC (US);
Chase T. Ellis, Silver Spring, MD (US);
Paul D. Cunningham, Baltimore, MD (US);
Rhonda M. Stroud, Washington, DC (US);
Michael H. Stewart, Springfield, VA (US);
Steven C. Erwin, Alexandria, VA (US);
Abstract
A process for synthesizing CuS/PbS core/shell nanocrystals. Pb-oleate is mixed with 1-octadecene and heated to 60° C. CuS core solution and bis(trimethylsilyl)sulfide stock solution are added and the mixture is stirred at 60° C. for 6 minutes to form the PbS shell around the CuS nanocrystal cores. The flask is cooled and acetonitrile and toluene is added and the mixture is centrifuged to precipitate and remove the CuS/PbS core/shell nanocrystals from the reaction mixture. The reaction also produces homogeneously nucleated PbS nanocrystals, which are removed from the CuS/PbS core/shell reaction mixture via size-selective precipitation. By tailoring the amounts of Pb-oleate and bis(trimethylsilyl)sulfide stock solution in the reaction vessel, while maintaining their molar ratio of 1.5:1 and the number of CuS cores in the reaction, CuS/PbS core/shell nanocrystals having a predetermined shell thickness of PbS, and thus a predetermined level of chemical stability, can be obtained.