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Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique

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A Printed Flexible Humidity Sensor with High Sensitivity and Fast Response Using a Cellulose Nanofiber/Carbon Black

Shogo Tachibana¹, Yi-Fei Wang¹, Tomohito Sekine¹

¹Research Center for Organic Electronics (ROEL), Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata 992-8510, Japan.

ACS Applied Materials & Interfaces

|January 24, 2022

Summary

Researchers developed a low-cost, flexible humidity sensor using cellulose nanofiber/carbon black composite for wearable devices. This printed sensor offers high sensitivity, fast response, and stability, enabling applications like monitoring human respiration.

Keywords:

cellulose nanofiber fast response flexible humidity sensor noncontact sensing wearable device

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Area of Science:

Materials Science
Sensor Technology
Nanotechnology

Background:

The Internet of Things (IoT) society requires advanced wearable devices with integrated sensors.
Existing flexible humidity sensors are often costly or use complex manufacturing, hindering widespread adoption.
There is a critical need for accessible, high-performance flexible humidity sensors.

Purpose of the Study:

To develop a novel, printed, flexible humidity sensor.
To utilize a cellulose nanofiber/carbon black (CNF/CB) composite for enhanced sensor performance.
To demonstrate the sensor's potential in wearable applications.

Main Methods:

Fabrication of a humidity sensor using a cellulose nanofiber/carbon black composite ink.
Ink formulation optimized for printing processes.
Characterization of sensor performance, including sensitivity, response/recovery times, stability, and flexibility.

Main Results:

The CNF/CB composite enabled efficient ink preparation and printing.
The sensor demonstrated significant resistance changes (120%) across a wide humidity range (30%-90% RH).
Achieved rapid response (10 s) and recovery (6 s) times, along with excellent uniformity, stability, and flexibility.

Conclusions:

A high-performance printed flexible humidity sensor was successfully developed using a CNF/CB composite.
The sensor's properties make it suitable for low-cost, wearable humidity sensing applications.
Proof-of-concept demonstrated successful monitoring of human respiration and fingertip moisture.