Thallium doped gadolinium chalcogenide nanocomposite

Patent metadata

Field	Value
Publication number	US-11215559-B2
Application number	US-202117377579-A
Country	US
Kind code	B2
Filing date	Jul 16, 2021
Priority date	Aug 23, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

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

The invention claimed is:

1. A fluorescent nanocomposite, comprising:
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 of formula I bound to a surface of the thallium doped gadolinium chalcogenide,

wherein:
R 1 is a C 1 -C 4 alkyl or an arylalkyl,
R 2 and R 3 are independently an optionally substituted alkyl group, or wherein R 2 and R 3 together form a five or six membered ring with the nitrogen to which they are attached,
R 4 and R 5 are independently a hydrogen or an alkyl group, and
A is Br, I, or ClO 4 .

2. The fluorescent nanocomposite of claim 1 , wherein x is 0.04 to 0.06 and Y is S.

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

4. The fluorescent nanocomposite of claim 1 , 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.

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. The fluorescent nanocomposite of claim 1 , wherein:
R 1 is a methyl, ethyl, or benzyl,
R 2 and R 3 are independently a methyl, an ethyl, or a 2-cyanoethyl, and
R 4 and R 5 are independently a hydrogen or a methyl.

7. The fluorescent nanocomposite of claim 1 , wherein the benzothiazolium salt of formula I is

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. The fluorescent nanocomposite of claim 1 , which has a fluorescence emissions peak at 605 to 620 nm at an excitation wavelength of 450 nm.

Assignees

• Univ King Abdulaziz

Inventors

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

Classifications

• B01J20/0248

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

• B01J20/0266

  Compounds of S · CPC title

• B82Y15/00

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

• C09K11/0822

  with rare earth metals · CPC title

• G01N33/1813

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