Fabrication of Nonsintered Alumina–Resin Hybrid Films by Inkjet-Printing Technology

Jang, Hun Woo; Kim, Jihoon; Kim, Hyotae; Yoon, Young Joon; Lee, Sung-nam; Hwang, Hae Jin; Lee, Jong Hyun

doi:10.1143/jjap.49.071501

Cited by 19 publications

(5 citation statements)

References 9 publications

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“…This method is relatively simple to use and thus easier to be applied to device fabrication. The cosolvent ink system can significantly enhance the Marangoni flow during evaporation and has been proved effective in device fabrication. − Another way to enhance the Marangoni flow is to add the surfactant to ink systems . This can also be a promising way to fabricate the uniform structure in the device …”

Section: Introductionmentioning

confidence: 99%

Morphology Modulation of Direct Inkjet Printing by Incorporating Polymers and Surfactants into a Sol–Gel Ink System

et al. 2018

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Many methods have been reported to prevent the nonuniformity of inkjet printing structures. Most of them depend on the balance of the capillary flow in the printing pattern during the evaporation of the solvent. However, as the relation of evaporation and capillary flow can obviously vary among different ink systems, it is difficult for a method to fit most of the situations. Therefore, it would be a promising way to eliminate any capillary flow before solvent evaporation so that morphology of the printing structure will not be affected by the evaporation behavior of the ink system. In this paper, a novel method of direct inkjet printing of a uniform metal oxide structure is reported. We introduce a polymer polyacrylamide and a surfactant FSO into a sol-gel ink system, and the new ink system can gel from the printing pattern edge to center as temperature increases because of the cross-linking of the polymer chains. By that means, transport of solute molecules and solvent molecules is limited. Meanwhile, the surfactant can ensure that the solute in the central liquid phase deposits uniformly by enhancing the Marangoni flow during the gelation process. The ZrO film with uniform morphology was fabricated by drying and annealing the gelating film and afforded a leakage current density of 7.48 × 10 A cm at 1 MV and a breakdown field of 1.9 MV cm at an annealing temperature of 250 °C.

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Section: Introductionmentioning

confidence: 99%

Morphology Modulation of Direct Inkjet Printing by Incorporating Polymers and Surfactants into a Sol–Gel Ink System

et al. 2018

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“…It should also be noted that only the NiZn‐ferrite film on the MgO surface showed film shrinkage. The dimensional shrinkage after the sintering process was attributed to the low packing density of the films; the packing density of inkjet‐printed ceramic films prepared from nanoparticle dispersion inks is known to be ≈50%–70% before the sintering process (see Table S1 and Figure S3 in the Supporting Information) . This observation confirms that there was no chemical interaction at the interface between the NiZn‐ferrite film and the MgO buffer layer.…”

Section: Resultsmentioning

confidence: 64%

Fully‐Inkjet‐Printed Ag‐Coil/NiZn‐Ferrite for Flexible Wireless Power Transfer Module: Rigid Sintered Ceramic Body into Flexible Form

Bissannagari

Lee

Lee³

et al. 2017

Adv Funct Materials

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Despite the material performances being superior to those of organic materials, inorganic materials are typically excluded for use in flexible and deformable electronic systems because of their rigid nature and the requirement for high processing temperature. This work presents a novel method of utilizing rigid NiZn-ferrite films in a flexible platform and offers an opportunity to realize a flexible wireless power transfer (WPT) module. Inkjet printing is introduced in this study since it can coat NiZn-ferrite films as well as pattern inductor coils for WPTs. A thermochemically inert buffer layer is selected based on a thermodynamic analysis and is introduced as a buffer layer for the NiZn-ferrite to prevent chemical reaction between the ferrite film and the substrate and ensure that the ferrite film can be easily separated from the substrate during a high-temperature sintering process. A Ag-inductor coil is printed on the NiZn-ferrite layer, and then the entire layer is embedded into polydimethylsiloxane, which renders the WPT module flexible. The flexibility of the WPT module is characterized by a bending test, and the structural and magnetic properties are also investigated. The performance of the flexi ble WPT module is demonstrated by transmitting wireless power to a light emitting diode.

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“…[52][53][54] The surface roughness of the alumina layer deposited by the inkjet printing process is determined by the X-axis pitch (X pitch) of alumina ink. [55][56][57] We measured changes in surface roughness value of the alumina layer according to different X pitch values by using a stylus surface profilometer (alpha-step, d-500). We found that the smoothest surface is obtained when the X pitch of alumina ink is 15 μm.…”

Section: Fabrication Of Hybrid Composites With Poresmentioning

confidence: 99%

Alumina‐Epoxy‐Pore Composites Fabricated by Inkjet Printing for Wireless Communication Technology

Jeong,

Park,

Chun

et al. 2023

Adv Materials Inter

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Reducing transmission loss via composites with pores has emerged as a breakthrough method for information and communications technology applications. The super/extremely high‐frequency signals used in the technologies result in significant transmission loss. Demand for low‐loss materials with low dielectric constant (Dk) and low dissipation factor (Df) has increased in recent years. Here, it is demonstrated that the pore in composites can be reduced Dk and Df of composites with pores (air). In fabrication of composites, a drop‐on‐demand (DOD) inkjet printing method to fabricate composites with pores (air) for use in wireless communications technologies. The DOD method is a simple but versatile manufacturing process at low cost. Its versatile process makes it possible to control the amount of resin and pore in fabrication of the composites and moreover to distribute all their components isotopically and homogeneously. It is possible to fabricate the composites with a lower Dk and Df value by increasing pore amount in the composites. This strategy enabled us to inexpensively manufacture dielectric substrates with low Dk and Df values, greatly contributing to the communications technology industry.

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Fabrication of Nonsintered Alumina–Resin Hybrid Films by Inkjet-Printing Technology

Cited by 19 publications

References 9 publications

Morphology Modulation of Direct Inkjet Printing by Incorporating Polymers and Surfactants into a Sol–Gel Ink System

Morphology Modulation of Direct Inkjet Printing by Incorporating Polymers and Surfactants into a Sol–Gel Ink System

Fully‐Inkjet‐Printed Ag‐Coil/NiZn‐Ferrite for Flexible Wireless Power Transfer Module: Rigid Sintered Ceramic Body into Flexible Form

Alumina‐Epoxy‐Pore Composites Fabricated by Inkjet Printing for Wireless Communication Technology

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