Fabrication of a printed capacitive air-gap touch sensor

Lee, Sang Hoon; Seo, Hwiwon; Lee, Sang Yoon

doi:10.7567/jjap.57.05gc04

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…The key factors that determine the printability of the layers, including the line per inch (LPI) of the engraved cylinder, the printing speed, the curing condition, and the appropriate viscosity of the magnetic ink, were optimized by repeated experiments. 15,[17][18][19][20][21][22][23][24][25][26] The patterns were engraved on a nickel-copper-plated cylinder. The printability and thickness of a printed layer strongly depend on the LPI of the engraved cylinder, the printing speed, the viscosity of the ink, and the curing conditions.…”

Section: Experimental Methodsmentioning

confidence: 99%

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Nguyen¹,

Lee²,

Shin³

et al. 2023

Jpn. J. Appl. Phys.

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Magnetic actuators are attractive for their capabilities of fast-response, large-deformation, and low-power-requirement compared to other types of actuators. The roll-to-roll printing is a continuous process with highest productivity. Here, we fabricated the cantilever-structured magnetic actuators using the roll-to-roll gravure printing process. By integrating an in-situ magnetization (ISM) process into the roll-to-roll printing process, the vector of the magnetic layer was programmed instantly during printing. This technique improved productivity and decreased materials waste. The fabrication process for the actuator includes printing the sacrificial layer, printing and magnetizing the magnetic layer, and coating the structural layer. An air gap between the substrate and cantilever beam of the actuator was made by removing the sacrificial layer. The actuator samples were examined in terms of displacement, hysteresis, and durability. Our actuators can rotate up to 90 ° and can be actuated at 20 Hz under a magnetic field of 80 mT.

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Section: Experimental Methodsmentioning

confidence: 99%

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Nguyen¹,

Lee²,

Shin³

et al. 2023

Jpn. J. Appl. Phys.

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“…Considering this requirement, a stretchable silver ink (SSP 2801, Toyobo, Osaka, Japan) was chosen as a suitable material for the top electrode. The stretchable silver ink has advantages over the general silver ink in terms of high restoration and elastic force and smaller probabilities of cracking and breakage [ 34 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Roll-to-Roll Printed Air-Gap Touch Sensors

Lee

2019

Polymers

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Although printed electronics technology has been recently employed in the production of various devices, its use for the fabrication of electronic devices with air-gap structures remains challenging. This paper presents a productive roll-to-roll printed electronics method for the fabrication of capacitive touch sensors with air-gap structures. Each layer of the sensor was fabricated by printing or coating. The bottom electrode, and the dielectric and sacrificial layers were roll-to-roll slot-die coated on a flexible substrate. The top electrode was formed by roll-to-roll gravure printing, while the structural layer was formed by spin-coating. In particular, the sacrificial layer was coated with polyvinyl alcohol (PVA) and removed in water to form an air-gap. The successful formation of the air-gap was verified by field emission scanning electron microscopy (FE-SEM). Electrical characteristics of the air-gap touch sensor samples were analyzed in terms of sensitivity, hysteresis, and repeatability. Experimental results showed that the proposed method can be suitable for the fabrication of air-gap sensors by using the roll-to-roll printed electronics technology.

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“…Several materials have been tested for printed electronics fabrication of air-gap-structured electronic devices (Table ). Poly(methyl methacrylate) (PMMA), removable in acetone; PDMS, removable in tetrabutyl ammonium (TBAF); and trimethylolethane (TME), removable by heating over 160 °C, have been used for the sacrificial layer, which is removed to form the air-gap. It is found from our previous reports that poly(vinyl alcohol) (PVA) is more suitable for the sacrificial layer than those three materials in Table . , Since PVA is the representative water-soluble material, the sacrificial layer made of PVA has less effect on the other layers of devices compared to the other materials.…”

Section: Introductionmentioning

confidence: 99%

“…As for fabrication processes of air-gap-structured electronic devices, inkjet printing and screen printing have been often used in printed electronics, − but roll-to-roll processes are considered more productive. − Printing/coating and curing are executed continuously during the roll-to-roll process, as the flexible substrate moves from the unwinder to the rewinder (Figure a). Various printing and coating methods can be applied to the roll-to-roll process.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Roll-to-Roll-Coated Cantilever-Structured Touch Sensors

Lee

2020

ACS Appl. Mater. Interfaces

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It is common in the field of printed electronics that polydimethylsiloxane (PDMS) be used as a dielectric layer for capacitive sensors because of its high elasticity and restoration force. However, capacitive sensors with the PDMS dielectric layer have a lower sensitivity than those with an air-gap structure that has been fabricated by the conventional micro-electromechanical system (MEMS) process. This paper presents a productive method for fabricating air-gap structures for touch sensors by roll-to-roll slot-die coating. The air-gap is formed by coating and removing a sacrificial layer. Cantilever-structured capacitive touch sensors with an air-gap are fabricated as follows: First, the bottom electrode, the dielectric layer, and the poly(vinyl alcohol) (PVA) sacrificial layer are roll-to-roll slot-die-coated on a flexible substrate. In addition, the spacer layer is spin-coated. On the sacrificial and spacer layers, the top electrode and structural layer are formed by spin-coating. Then, the air-gap and cantilever structure are made by removing the sacrificial layer in water. The cantilever-structured sensor samples are examined in terms of sensitivity, hysteresis, and repeatability. In particular, the electrical performance of the samples is compared to those with the PDMS dielectric layer. Experimental results show that the cantilever-structured sensor samples have significantly higher sensitivity compared to those with the PDMS dielectric layer.

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Fabrication of a printed capacitive air-gap touch sensor

Cited by 7 publications

References 34 publications

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Fabrication and Characterization of Roll-to-Roll Printed Air-Gap Touch Sensors

Fabrication and Characterization of Roll-to-Roll-Coated Cantilever-Structured Touch Sensors

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