US 12,275,881 B1
Method for making bismuth oxyhalide quantum dots
Babiker Y. Abdulkhair, Riyadh (SA); Faisal K. Algethami, Riyadh (SA); and Mohamed R. Elamin, Riyadh (SA)
Assigned to IMAM MOHAMMAD IBN SAUD ISLAMIC UNIVERSITY, Riyadh (SA)
Filed by IMAM MOHAMMAD IBN SAUD ISLAMIC UNIVERSITY, Riyadh (SA)
Filed on Dec. 4, 2024, as Appl. No. 18/968,443.
Application 18/968,443 is a continuation of application No. 18/798,885, filed on Aug. 9, 2024, granted, now 12,187,940.
Application 18/798,885 is a continuation of application No. 18/665,855, filed on May 16, 2024, granted, now 12,110,434, issued on Oct. 8, 2024.
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 11/74 (2006.01); C01G 29/00 (2006.01)
CPC C09K 11/7428 (2013.01) [C01G 29/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of making bismuth oxyhalide quantum dots, comprising:
forming a first solution by dissolving a bismuth salt in an organic solvent selected from the group consisting of polyethylene glycol, methylene glycol, tri-ethylene glycol, and ethylene glycol;
forming a second solution by dissolving an alkali metal salt in water;
combining the first solution and the second solution to obtain a dual mixture;
combining the dual mixture with an aqueous surfactant solution comprising a surfactant to obtain a final mixture comprising the bismuth oxyhalide quantum dots, wherein the surfactant is a polyoxyethylene glycol sorbitan alkyl ester; and
filtering the final solution to obtain the bismuth oxyhalide quantum dots,
wherein the alkali metal salt is selected from the group consisting of LiI, NaI, KI, CsI, LiBr, NaBr, KBr, CsBr, LiCl, NaCl, KCl, and CsCl, and
wherein the method is carried out without added heat.