Conductive polymer nanocellulose aerogels and use as strain sensor

Patent metadata

Field	Value
Publication number	US-11549854-B2
Application number	US-202016874490-A
Country	US
Kind code	B2
Filing date	May 14, 2020
Priority date	May 15, 2019
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

The present disclosure provides an aerogel comprising conductive polymers and cellulose nanofibrils (CNF). The present disclosure also provides a sensor comprising the aerogels of the present invention.

First claim

What is claimed is:

1. An aerogel composition comprising:
a conductive polymer; and
cellulose nanofibrils (CNF), wherein the CNF is present in the composition at from 10% to 90% (w/w).

2. The composition of claim 1 , wherein the conductive polymer is an acidic conductive polymer.

3. The composition of claim 1 , wherein the conductive polymer comprises a mixture of poly(3,4-ethylene dioxythiophene) (PEDOT) and poly(styrene sulfonate) (PSS).

4. The composition of claim 3 , wherein the mixture comprises a ratio of PEDOT to PSS of 1:1 to 1:10 (w/w).

5. The composition of claim 3 , wherein the mixture comprises a ratio of PEDOT to PSS of about 1:2.5 (w/w).

6. The composition of claim 1 , wherein the CNF is present in the composition at from 25% to 75% (w/w).

7. The composition of claim 1 , wherein the conductive polymer comprises a mixture of poly(3,4-ethylene dioxythiophene) (PEDOT) and poly(styrene sulfonate) (PSS) in a ratio of about 1:2.5 (w/w), and the CNF is present in the composition at about 70% (w/w).

8. A sensor comprising:
a first polymer substrate having a first surface;
a conducting layer comprising an aerogel composition of claim 1 , wherein the conducting layer is deposited on the first surface of the first polymer substrate and having a first end and a second end;
a first electrode at the first end of the conductive layer;
a second electrode at the second end of the conductive layer; and
a second polymer substrate deposited on the conducting layer.

9. The sensor of claim 8 , wherein the first polymer substrate and second polymer substrate is polydimethylsiloxane (PDMS).

Assignees

• Univ California

Inventors

• Hsieh You-Lo
• Zhou Jian

Classifications

• C08G2261/94

  Applications in sensors, e.g. biosensors · CPC title

• G01L1/2287 Primary

  constructional details of the strain gauges (adjustable resistors H01C10/00) · CPC title

• C08J2465/00

  Characterised by the use of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08J2407/00 - C08J2457/00, C08J2461/00 take precedence); Derivatives of such polymers · CPC title

• C08J9/0061 Primary

  characterized by the use of several polymeric components · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title