Inkjet printed differential mode touch and humidity sensors on injection molded polymer packages

Author

Matic, Vladimir ; Liedtke, Laura ; Guenther, Thomas ; Buelau, Andre ; Ilchmann, Annemarie ; Keck, Juergen ; Polzinger, Bernhard ; Eberhardt, Wolfgang ; Kueck, Heinz

Author_Institution

HSG-IMAT Inst. for Micro Assembly Technol., Freiburg, Germany

fYear

2014

fDate

2-5 Nov. 2014

Firstpage

2234

Lastpage

2237

Abstract

Today´s printed electronics are mainly focused on producing sensors on thin, flexible, smooth foils, which limits their use on 2D applications. Within this study we report on the design of inkjet printed capacitive touch and humidity sensors on thermoplastic substrates, to fabricate printed functional structures on injection molded 3D components. Both sensors are based on printed differential interdigital capacitors (IDC) made of silver ink and a printed sensitive layer. Reproducible results and low hysteresis were achieved, proving the concept to be able to improve sensitivity and to reduce drift effects due to temperature as well as moisture absorption by the substrate.

Keywords

capacitance measurement; capacitive sensors; capacitors; humidity sensors; injection moulding; ink jet printing; polymers; tactile sensors; 2D application; IDC; drift effect reduction; humidity sensor; injection molded 3D component; injection molded polymer packaging; inkjet printed capacitive touch design; inkjet printed differential mode touch sensor; moisture absorption; printed differential interdigital capacitor; printed electronics; printed functional structure; printed sensitive layer; silver ink; thermoplastic substrate; Capacitive sensors; Humidity; Printing; Substrates; Tactile sensors; Temperature sensors; humidity sensor; injection molding; inkjet printing; polymer package; touch sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

SENSORS, 2014 IEEE

Conference_Location

Valencia

Type

conf

DOI

10.1109/ICSENS.2014.6985485

Filename

6985485