Quantum dot nanocomposite containing benzothiazolium

Patent metadata

Field	Value
Publication number	US-2021381974-A1
Application number	US-202117408973-A
Country	US
Kind code	A1
Filing date	Aug 23, 2021
Priority date	Aug 23, 2019
Publication date	Dec 9, 2021
Grant date	—

Abstract

A fluorescent nanocomposite which includes a thallium doped gadolinium chalcogenide having formula Tl x Gd 1-x Y, wherein x is 0.01 to 0.1, and Y is selected from the group consisting of S, Se, or Te, and a benzothiazolium salt bound to a surface of the thallium doped gadolinium chalcogenide. A method of detecting antimony ions in a fluid sample whereby the fluid sample is contacted with the fluorescent nanocomposite to form a mixture, and a fluorescence emission profile of the mixture is measured to determine a presence or absence of antimony ions in the fluid sample, wherein a reduction in intensity of a fluorescence emissions peak associated with the fluorescent nanocomposite indicates the presence of antimony ions in the fluid sample.

First claim

1 . A quantum dot fluorescent nanocomposite, comprising:
a thallium doped gadolinium chalcogenide having formula Tl x Gd 1-x Y, wherein x is 0.04 to 0.06, and Y is S, wherein the thallium doped gadolinium chalcogenide is in the form of core-type quantum dots having an average particle size of 3 to 7 nm; and a benzothiazolium salt of formula I bound to a surface of the thallium doped gadolinium chalcogenide, wherein the benzothiazolium salt has the following formula I:

2 . (canceled)

3 . The fluorescent nanocomposite of claim 1 , wherein the thallium doped gadolinium chalcogenide is Tl 0.05 Gd 0.95 S.

4 . (canceled)

5 . The fluorescent nanocomposite of claim 1 , wherein the thallium doped gadolinium chalcogenide is present in an amount of 14 to 35 wt. %, based on a total weight of the fluorescent nanocomposite.

6 . (canceled)

7 . (canceled)

8 . The fluorescent nanocomposite of claim 1 , wherein a weight ratio of the benzothiazolium salt of formula I to the thallium doped gadolinium chalcogenide is 1.95:1 to 6.0:1.

9 . The fluorescent nanocomposite of claim 1 , wherein the benzothiazolium salt of formula I is present in an amount of 65 to 86 wt. %, based on a total weight of the fluorescent nanocomposite.

10 . The fluorescent nanocomposite of claim 1 , which consists of the thallium doped gadolinium chalcogenide and the benzothiazolium salt of formula I.

11 - 20 . (canceled)

Assignees

• Univ King Abdulaziz

Inventors

• ELSAYED Waleed Elsayed Mahmoud
• Al-Ghamdi Ahmed Abdullah Salem
• Al-Turki Yusuf Abdulaziz

Classifications

• B82Y15/00

  Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors · CPC title

• G01N2021/6432

  Quenching · CPC title

• C02F1/288

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title

• G01N21/643 Primary

  non-biological material · CPC title

• G01N33/1813

  Specific cations in water, e.g. heavy metals · CPC title