A High-Wet-Strength Biofilm for Readable and Highly Sensitive Humidity Sensors

In this letter, we present the extension of a previous work on a cost-effective method for fabricating highly sensitive humidity sensors on flexible substrates with a reversible response, allowing precise monitoring of the humidity threshold. In that work we demonstrated the use of three-dimensional metal-organic framework (MOF) film deposition based on the perylene-3,4,9,10-tetracarboxylate linker, potassium as metallic center and the interspacing of silver interdigitated electrodes (IDEs) as humidity sensors. In this work, we study one of the most important issues in efficient and reproducible mass production, which is to optimize the most important processes’ parameters in their fabrication, such as controlling the thickness of the sensor’s layers. We demonstrate this method not only allows for the creation of humidity sensors, but it also is possible to change the humidity value that changes the actuator state.

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Fabrication of fast, highly sensitive all-printed capacitive humidity sensors with carbon nanotube/polyimide hybrid electrodes

Japanese Journal of Applied Physics ◽

10.7567/jjap.55.02bb10 ◽

2016 ◽

Vol 55 (2S) ◽

pp. 02BB10 ◽

Cited By ~ 2

Author(s):

Eiji Itoh ◽

Akinori Takada

Keyword(s):

Carbon Nanotube ◽

Humidity Sensors ◽

Highly Sensitive

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Highly-Sensitive Humidity Sensors for Condition Monitoring of Hybrid Laminates

Materials Science Forum ◽

10.4028/www.scientific.net/msf.825-826.579 ◽

2015 ◽

Vol 825-826 ◽

pp. 579-585 ◽

Cited By ~ 2

Author(s):

Thomas Seider ◽

Joerg Martin ◽

Alexander Boeddicker ◽

Julia Rühling ◽

Daniel Wett ◽

...

Keyword(s):

Condition Monitoring ◽

Fold Increase ◽

Humidity Sensors ◽

Reinforced Polymers ◽

Lightweight Structures ◽

Humidity Change ◽

Highly Sensitive ◽

Hybrid Laminates ◽

Low Mass ◽

Response To Water

In recent years fibre-reinforced polymers (FRPs) gained importance in a wider field of application due to such favourable properties as low mass and tailorable mechanical strength. However, water penetrating into the lightweight material can lead to a loss of shear strength and finally to a collapse of the whole mechanical structure. Consequently, the integration of humidity sensors into compound materials is able to promote the reliability via online condition monitoring. An innovative concept is the use of ceramics-polymer-composites, which are well suited for the integration into lightweight structures during inline production. Composite and polyimide based humidity sensors have been manufactured by flexographic printing and spin-coating processes. A 5-fold increase in sensor’s capacity related to a humidity change from 10 to 80 % r.h. manifests the outstanding sensitivity of manufactured composite sensors. In addition, FRP-integrated polyimide sensors showed a significant response to water penetration, whereby the capability of condition monitoring could be confirmed.

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