Integration of a Thin Film PDMS-Based Capacitive Sensor for Tactile Sensing in an Electronic Skin

El-Molla, Sara; Albrecht, Andreas; Cagatay, Engin; Mittendorfer, Philipp; Cheng, Gordon; Lugli, Paolo; Salmerón, José F.; Rivadeneyra, Almudena

doi:10.1155/2016/1736169

Cited by 38 publications

(26 citation statements)

References 34 publications

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“…It offers a contactless method in which small drops of ink are digitally controlled; to be precisely deposited on the surface of a substrate. Moreover, it provides many appealing features such as real-time adjustment, high resolution, low cost, low processing temperature, flexible design patterns, high throughput processing, minimal usage of printing materials, less complexity of fabrication steps, compatibility with various substrates, and having no requirement for mask patterning [6,8,9,10,11,12]. …”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Inkjet-Printed Stretchable Circuits for Wearable Sensor Applications

Abu-Khalaf

Saraireh

Eisa

et al. 2018

Sensors

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This paper introduces a cost-effective method for the fabrication of stretchable circuits on polydimethylsiloxane (PDMS) using inkjet printing of silver nanoparticle ink. The fabrication method, presented here, allows for the development of fully stretchable and wearable sensors. Inkjet-printed sinusoidal and horseshoe patterns are experimentally characterized in terms of the effect of their geometry on stretchability, while maintaining adequate electrical conductivity. The optimal fabricated circuit, with a horseshoe pattern at an angle of 45°, is capable of undergoing an axial stretch up to a strain of 25% with a resistance under 800 Ω. The conductivity of the circuit is fully reversible once it is returned to its pre-stretching state. The circuit could also undergo up to 3000 stretching cycles without exhibiting a significant change in its conductivity. In addition, the successful development of a novel inkjet-printed fully stretchable and wearable version of the conventional pulse oximeter is demonstrated. Finally, the resulting sensor is evaluated in comparison to its commercially available counterpart.

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Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Inkjet-Printed Stretchable Circuits for Wearable Sensor Applications

Abu-Khalaf

Saraireh

Eisa

et al. 2018

Sensors

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show abstract

“…PDMS elastomer has also been a rising candidate in developing the high‐performance electronic skin (Bao & Chen, ; Chortos & Bao, ; Chortos, Liu, & Bao, ). Sara EI‐Molla (El‐Molla et al, ) and Nam‐Joon Cho (Wang et al, ) both presented high‐performance electronic skin sensors by integrating a thin PDMS‐based film into their sensors. Cheng and co‐workers (Ho et al, ) fabricated an invisible and unfeelable wearable strain sensor by encapsulating the percolating network of soft gold nanowires and rigid silver nanowires with a layer of PDMS.…”

Section: Introductionmentioning

confidence: 99%

One‐component waterborne in vivo cross‐linkable polysiloxane coatings for artificial skin

Ailing

Zhou

2019

J Biomed Mater Res

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Polysiloxane‐based artificial skins are able to emulate the mechanical and barrier performance of human skin. However, they are usually fabricated in vitro, restricting their diverse applications on human body. Herein, we presented one‐component waterborne cross‐linkable polysiloxane coatings prepared from emulsified vinyl dimethicone, emulsified hydrogen dimethicone, and Karstedt catalyst capsules that were first synthesized by solvent evaporation method. The coating had good storage stability and meanwhile could form an elastic film quickly through merging of silicone oil droplets and subsequent hydrosilylation reaction. It was found that the mass ratio of vinyl dimethicone emulsion/hydrogen dimethicone emulsion (V/H), and the dosage of Karstedt catalyst capsules (K/(V + H)) were critical to the curing time, morphology, and mechanical properties of the coatings. With appropriate values of V/H and K/(V + H), the polysiloxane film had the mechanical performance comparable to that from solvent‐based one. The coating could be topically applied to human skin in vivo and in situ turned into an elastic, invisible thin film with good water resistance. In contrast to those reported polysiloxane materials, the one‐component waterborne polysiloxane coating was nontoxic and convenient for in vivo application on human body, making it be a promising candidate as artificial skin in the fields of cosmetics, medical treatment, and E‐skin.

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“…As a result, PDMS films are therefore particularly well suited to be part of wearable capacitive force or pressure sensors [9]. Indeed, associated with metallic electrodes, the deformation of the PDMS films under pressure induces capacitance changes between electrodes that can be read out for pressure measurement purposes.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, these properties are strongly dependent on the thickness of the fabricated PDMS film. For example, the elasticity of a given film type has been reported as being nonlinearly dependent on the thickness of the fabricated film [9,15]. Finally, PDMS films are hardly compressible (Poisson coefficient ] close to 0.5); the accurate knowledge of the mechanical behavior of thin films under local stresses is of considerable importance for the appropriate design of normal pressure microsensors.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of PDMS Films for the Optimization of Polymer Based Flexible Capacitive Pressure Microsensors

et al. 2017

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This paper reports on the optimization of flexible PDMS-based normal pressure capacitive microsensors dedicated to wearable applications. The operating principle and the fabrication process of such microsensors are presented. Then, the deformations under local pressure of PDMS thin films of thicknesses ranging from 100 m to 10 mm are studied by means of numerical simulations in order to foresee the sensitivity of the considered microsensors. The study points out that, for a given PDMS type, the sensor form ratio plays a major role in its sensitivity. Indeed, for a given PDMS film, the expected capacitance change under a 10 N load applied on a 1.7 mm radius electrode varies from a few percent to almost 40% according to the initial PDMS film thickness. These observations are validated by experimental characterizations carried out on PDMS film samples of various thicknesses (10 m to 10 mm) and on actual microsensors. Further computations enable generalized sensor design rules to be highlighted. Considering practical limitations in the fabrication and in the implementation of the actual microsensors, design rules based on computed form ratio optimization lead to the elaboration of flexible pressure microsensors exhibiting a sensitivity which reaches up to 10%/N.

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Integration of a Thin Film PDMS-Based Capacitive Sensor for Tactile Sensing in an Electronic Skin

Cited by 38 publications

References 34 publications

Experimental Characterization of Inkjet-Printed Stretchable Circuits for Wearable Sensor Applications

Experimental Characterization of Inkjet-Printed Stretchable Circuits for Wearable Sensor Applications

One‐component waterborne in vivo cross‐linkable polysiloxane coatings for artificial skin

Mechanical Characterization of PDMS Films for the Optimization of Polymer Based Flexible Capacitive Pressure Microsensors

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