Decomposable S-tetrazine based polymers for single walled carbon nanotube applications

Patent metadata

Field	Value
Publication number	US-10222346-B2
Application number	US-201715708855-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Jan 9, 2017
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A process for purifying semiconducting single-walled carbon nanotubes (sc-SWCNTs) extracted with a conjugated polymer, the process comprising exchanging the conjugated polymer with an s-tetrazine based polymer in a processed sc-SWCNT dispersion that comprises the conjugated polymer associated with the sc-SWCNTs. The process can be used for production of thin film transistors and chemical sensors. In addition, disclosed herein is use of an s-tetrazine based polymer for purification of semiconducting single-walled carbon nanotubes (sc-SWCNTs).

First claim

We claim:

1. A process for producing a chemical sensor that detects one or more chemicals in the ppt to ppb range, the process comprising:
a) applying a dispersion of a sc-SWCNT/s-tetrazine based conjugated polymer composite to a substrate;
b) applying heat and/or UV light to decompose the s-tetrazine based conjugated polymer; and
c) removing the resulting decomposition products.

2. The process of claim 1 , wherein the sensor has a lower detection limit of from 4 ppt to 100 ppb.

3. The process of claim 1 , wherein the one or more chemicals is gaseous ammonia or gaseous nitrogen dioxide (NO 2 ).

4. The process of claim 1 , wherein the s-tetrazine based polymer has the following structure:

where A is O, S, Se or C═C; n is an integer from 1 to 4; R 1 is independently H, F, CN or a C1-C20 linear or branched aliphatic group; Ar is one or more substituted or unsubstituted aromatic units; and, m is an integer 5 or greater.

5. The process of claim 1 , wherein the s-tetrazine based polymer is PBDTFTz:

6. The process of claim 1 , wherein the s-tetrazine based polymer is PDTSTTz:

7. The process of claim 1 , wherein the s-tetrazine based polymer is PCPDTFTz:

in which Ar=cyclopenta[2,1-b;3.4-b′]dithiophene.

8. The process of claim 1 , wherein the conjugated polymer comprises a polyfluorene or polythiophene.

Assignees

• Nat Res Council Canada

Inventors

• Li Zhao
• Ding Jianfu
• Malenfant Patrick Roland Lucien

Classifications

• C08G2261/12

  Copolymers · CPC title

• C08G2261/3223

  containing one or more sulfur atoms as the only heteroatom, e.g. thiophene · CPC title

• C01B2202/02

  Single-walled nanotubes · CPC title

• C08G2261/3243

  containing one or more sulfur atoms as the only heteroatom, e.g. benzothiophene · CPC title

• C08K3/041

  Carbon nanotubes · CPC title