3D printed graphene-coated flexible lattice as piezoresistive presure sensor

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University of Groningen

3D printed graphene-coated flexible lattice as piezoresistive presure sensor Kamat, Amar M; Kottapalli, Ajay Giri Prakash

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2021

Link to publication in University of Groningen/UMCG research database

Citation for published version (APA):

Kamat, A. M., & Kottapalli, A. G. P. (Accepted/In press). 3D printed graphene-coated flexible lattice as piezoresistive presure sensor. Poster session presented at Transducers 2021, .

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B4-411d

3D PRINTED GRAPHENE-COATED FLEXIBLE LATTICE

AS PIEZORESISTIVE PRESSURE SENSOR

Amar M. Kamat

1,*

and Ajay Giri Prakash Kottapalli

1,2

1

_{Advanced Production Engineering, University of Groningen, Groningen, the Netherlands}

2

_{MIT Sea Grant College Program, Massachusetts Institute of Technology, Cambridge, USA}

*

_{a.m.kamat@rug.nl}

Background

- Piezoresistive sponges are a popular design for flexible pressure sensors. - Advantages: higher strain, light weight, fast recovery time, low hysteresis.

- Traditional methods (direct templating, emulsion templating, gas forming, etc.) do not afford good control on sponge microstructure and properties.

Sensor fabrication

Methodology

- Utilize design freedom of stereolithography (SLA) 3D printing to fabricate elastic foams with desired structure (e.g. body-centered cubic) and properties.

- Dip-coat lattice structure with graphene nanoparticles (GNP) to make it piezoresistive. - High gauge factor of GNP + compressible elastomeric BCC lattice = high sensitivity.

Sensor characterization

Summary and conclusions

Ref. Gauge factor

Sensitivity

(kPa-1) Materials

This work 3.25 0.1 Formlabs elastic resin BCC lattice + GNP

Ref. [1] 0.38 0.023 Polyurethane sponge

+ carbon black

Ref. [2] 1.58 N/A Polyurethane sponge +

cellulose/Ag nanowire

Ref. [3] N/A 0.033 PDMS sponge + CNT

Stress-strain curve Static test

Dynamic test (1 Hz) Comparison with the literature

- Piezoresistive pressure sensor showed low stiffness (31.5 kPa), high compressibility (up to 60%), high gauge factor (3.25) and sensitivity (0.1 kPa-1).

- 3D printing workflow can enable better control over sensor properties (e.g. tunable stiffness, density, porosity) compared to traditional methods of making spongy sensors.

[1] X. Wu et al., Adv. Funct. Mater., vol. 26, no. 34, pp. 6246–6256, 2016

[2] S. Zhang et al., ACS Appl. Mater. Interfaces, vol. 11, no. 11, pp. 10922–10932, 2019 [3] Y. Song et al., Small, vol. 13, no. 39, p. 1702091, Oct. 2017

This work was funded by the ITEA DayTime (ITEA-2018-17030-Daytime) and the NWO Idea Generator (NWA.1228.192.279) projects. The authors thank Melvin van der Werff for his help with lattice design.