A highly sensitive flexible humidity sensor based on conductive tape and a carboxymethyl cellulose@graphene composite

Flexible humidity sensors have found new applications in diverse fields including human healthcare, the Internet of Things, and so on. In this paper, a highly sensitive humidity sensor based on carboxymethyl cellulose@graphene and conductive adhesive tape was developed. The sensor was constructed on...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2023-09, Vol.13 (4), p.27746-27755
Main Authors: Wang, Haoxiang, Tang, Chengli, Xu, Jun
Format: Article
Language:English
Subjects:
Carboxymethyl cellulose
Cellulose
Chemistry
Contact angle
Graphene
Grooves
Humidity
Internet of Things
Relative humidity
Sensors
Substrates
Three dimensional printing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Flexible humidity sensors have found new applications in diverse fields including human healthcare, the Internet of Things, and so on. In this paper, a highly sensitive humidity sensor based on carboxymethyl cellulose@graphene and conductive adhesive tape was developed. The sensor was constructed on conductive tape which acted as both of the flexible substrate and the electrode to transmit electronic signals. A carboxymethyl cellulose@graphene composite was assembled on the substrate as the sensing layer by a simple spreading method in a 3-D printed groove mold. The sensitive material was characterized for its morphology, composition, crystalline phase, and hydrophilicity by SEM, EDS, XRD, and contact angle measurements. The effect of graphene on the sensitivity was investigated in detail by adjusting the doping concentration. Humidity sensing performance was tested in different relative humidity levels. The rapid responses under different respiratory conditions demonstrated their practical usability in continuous respiration monitoring and recognition of respiratory status. The conductive mechanism of the sensing film was studied by complex impedance spectroscopy under different relative humidity levels. A rational sensing mechanism was proposed integrating ionic conduction, electron conduction and swelling behavior of the carboxymethyl cellulose@graphene composite. A flexible humidity sensor was prepared with carboxymethyl cellulose@graphene as the sensing material and conductive tape as the substrate. The humidity sensing property was determined by the ionic conduction, electron conduction and swelling effect.
ISSN:2046-2069
2046-2069
DOI:10.1039/d3ra05232j