Quantum dot nanocomposite containing benzothiazolium

Patent metadata

Field	Value
Publication number	US-11209366-B1
Application number	US-202117408973-A
Country	US
Kind code	B1
Filing date	Aug 23, 2021
Priority date	Aug 23, 2019
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A fluorescent nanocomposite which includes a thallium doped gadolinium chalcogenide having formula TlxGd1-xY, 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

The invention claimed is:

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

3. 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.

4. 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.

5. 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.

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

Assignees

• Univ King Abdulaziz

Inventors

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

Classifications

• C09K11/7701

  Chalogenides · CPC title

• C09K11/0822

  with rare earth metals · CPC title

• B01J20/0248

  Compounds of B, Al, Ga, In, Tl (B01J20/08 takes precedence) · CPC title

• C09K11/621 Primary

  Chalcogenides · CPC title

• G01N33/1813

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