Soft blanket gravure printing technology for finely patterned conductive layers on three-dimensional or curved surfaces

Izumi, Kunihide; Yoshida, Yuta; Tokito, Shizuo

doi:10.7567/jjap.56.05ea03

Cited by 18 publications

(18 citation statements)

References 29 publications

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“…Printing is very useful technique, since it enables rapid pattern formation at low cost. Flexographic printing [ 12 , 13 , 14 ], microcontact printing [ 15 ], gravure printing [ 16 ], gravure-offset printing [ 17 , 18 ], soft blanket gravure printing [ 19 ], reverse-offset printing [ 20 , 21 , 22 , 23 ], and adhesion contrast planography [ 24 ] have all been proposed as pattern formation techniques. Of these, we employ screen-offset printing, which is based on screen printing.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Nomura

Horii

Kanazawa

et al. 2018

Sensors

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We fabricate a wearable blood leakage sensor on a cotton textile by combining two newly developed techniques. First, we employ a screen-offset printing technique that avoids blurring, short circuiting between adjacent conductive patterns, and electrode fracturing to form an interdigitated electrode structure for the sensor on a textile. Furthermore, we develop a scheme to distinguish blood from other substances by utilizing the specific dielectric dispersion of blood observed in the sub-megahertz frequency range. The sensor can detect blood volumes as low as 15 μL, which is significantly lower than those of commercially available products (which can detect approximately 1 mL of blood) and comparable to a recently reported value of approximately 10 μL. In this study, we merge two technologies to develop a more practical skin-friendly sensor that can be applied for safe, stress-free blood leakage monitoring during hemodialysis.

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Section: Introductionmentioning

confidence: 99%

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Nomura

Horii

Kanazawa

et al. 2018

Sensors

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“…We found that the conductivity of the formed patterns relies on the concentration of AgNW. The resistance of the pure Ag pattern has a relatively high value because of electron scattering at the many contact points of the Ag granules, whereas AgNW, which is an anisotropic material with low defect density that can act as an electron highway, ensures the relatively high conductivity of the Ag/AgNW composite pattern. , Moreover, AgNWs can provide the mechanical properties to the Ag/AgNW composite pattern necessary to conform to the steps. Figure d–f shows the SEM images which illustrate the role of the AgNWs at the steps.…”

Section: Resultsmentioning

confidence: 99%

Three-Dimensionally Printed Interconnects for Smart Contact Lenses

Kim

Kang

et al. 2018

ACS Appl. Mater. Interfaces

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One of the ultimate wearable heath-monitoring gears, smart contact lens, requires miniaturized devices compounded and interconnected with each other on the lens for a successful system functioning. Because of the different device thickness, the interconnect patterns need to be three-dimensional (3D) conforming the steps given by the diversified on-lens devices. Also, the patterns should be low-temperature processed and flexible considering the mechanical and thermal property of the lens material. We demonstrate the 3D interconnects electrosprayed on a contact lens platform with Ag-Ag nanowire (NWs) composite ink conforming the steps. Quantitative and informative analysis on the interconnects is presented. Thick polyimide film (12.5 μm) in C-shape is employed as a primary substrate to form the 3D patterns that is to be transferred onto the contact lens. The AgNWs act as frames to support the Ag ion inks printed across the steps. The resultant interconnects realized with the Ag/AgNW composite ink with 0.3 wt % AgNW have the sheet resistance ( R) of 0.396 Ω/□ spanning the height difference of 300 μm. AgNWs also provide durability to the patterns against crack formation and propagation under significant device deformation. Unlike pure Ag pattern which shows the R changes of 86.1% in the bending condition, the optimally formulated composite pattern shows the suppressed R change of only 15.2% with a bending radius of 3 mm.

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“…Besides, our enzymebased biosensor can be fabricated using printing technology. Employing advanced printing technologies [33] will enable direct and on-demand printing of biosensing systems on threedimensional curved surfaces of conventional, existing wearable medical devices such as mouth guards, soft contact lenses, wound dressings, wristbands, and even human skin in the future. [34] Figure 1a shows the structure of the extended-gate type organic transistor device.…”

Section: Discussionmentioning

confidence: 99%

Printed Organic Transistor‐Based Enzyme Sensor for Continuous Glucose Monitoring in Wearable Healthcare Applications

et al. 2018

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A printed extended‐gate‐type organic transistor‐based enzyme sensor for the continuous monitoring of D‐glucose has been developed through a simple modification of the electrical circuit. The sensor is composed of a glucose oxidase (GOx)/Prussian blue (PB)‐modified extended‐gate electrode and an Ag/AgCl reference electrode, which are connected to the gate and source electrodes of an organic transistor, respectively. The GOx/PB‐modified extended‐gate electrode and Ag/AgCl reference electrode were short‐circuited by an external resistor to spontaneously induce redox cycling of PB. Continuous monitoring of the source‐drain current of the organic transistor for various concentrations of D‐glucose was successfully demonstrated in this system. This is the first report of the transistor‐based enzyme sensor exhibiting reversible response to the analytes in physiologically buffered solution without the addition of any chemical reagents. This new type of printed organic transistor‐based enzyme sensor will greatly contribute to the development of wearable biosensors for non‐invasive monitoring of biomarkers in externally secreted bodily fluids such as tears, saliva, and sweat.

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Soft blanket gravure printing technology for finely patterned conductive layers on three-dimensional or curved surfaces

Cited by 18 publications

References 29 publications

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Fabrication of a Textile-Based Wearable Blood Leakage Sensor Using Screen-Offset Printing

Three-Dimensionally Printed Interconnects for Smart Contact Lenses

Printed Organic Transistor‐Based Enzyme Sensor for Continuous Glucose Monitoring in Wearable Healthcare Applications

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