Chemiresistive sensors based on carbon nanotubes and transition metal complexes

Patent metadata

Field	Value
Publication number	US-11143613-B2
Application number	US-201916275275-A
Country	US
Kind code	B2
Filing date	Feb 13, 2019
Priority date	Feb 14, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A sensor can include a conductive region in electrical communication with at least two electrodes, the conductive region can include a mixture of a square-planar metal complex and a carbon nanotube.

First claim

What is claimed is:

1. A method of sensing an analyte comprising:
exposing a sensor to a sample, the sensor including:
a conductive region in electrical communication with at least two electrodes, the conductive region including a mixture of a square-planar metal complex and a carbon nanotube;
measuring an electrical property at the at least two electrodes; and
detecting formic acid.

2. The method of claim 1 , wherein the square-planar metal complex includes a nickel complex.

3. The method of claim 2 , wherein the square-planar metal complex includes a palladium complex.

4. The method of claim 2 , wherein the square-planar metal complex includes phenylenediamine.

5. The method of claim 1 , wherein the carbon nanotube is non-covalently functionalized by the square-planar metal complex.

6. The method of claim 1 , wherein the carbon nanotube is a single-walled carbon nanotube.

7. The method of claim 1 , wherein the detection is semi-reversible.

8. The method of claim 1 , further comprising detecting the analyte below 5 ppm.

9. A method of sensing an analyte comprising:
exposing a sensor to a sample, the sensor including:
a conductive region in electrical communication with at least two electrodes, the conductive region including a mixture of a square-planar metal complex and a carbon nanotube;
measuring an electrical property at the at least two electrodes; and
selectively detecting formic acid.

10. A method of preparing a sensor comprising:
forming a complex including a conductive region in electrical communication with at least two electrodes, the conductive region including a mixture of a square-planar metal complex and a carbon nanotube; and
placing the conductive material in electrical communication with the at least two electrodes
measuring an electrical property at the at least two electrodes; and
selectively detecting formic acid.

11. The method of claim 10 , wherein the square-planar metal complex includes two or more selectors.

12. The method of claim 11 , wherein the two or more selectors leverage their chelating N—H moieties to facilitate protonation or p-doping of a CNT chemiresistor network by formic acid vapors.

Assignees

• Massachusetts Inst Technology

Inventors

• Swager Timothy
• Lin Sibo

Classifications

• G01N33/0004 Primary

  Gaseous mixtures, e.g. polluted air · CPC title

• G01N33/0047

  Organic compounds · CPC title

• G01N27/127 Primary

  comprising nanoparticles · CPC title

• G01N33/02

  Food · CPC title