Formulation of Screen Printable Cobalt Nanoparticle Ink for High Frequency Applications

Nelo, Mikko; Sowpati, Arun; Palukuru, Vamsi Krishna; Juuti, Jari; Jantunen, Heli

doi:10.2528/pier10102101

Cited by 26 publications

(15 citation statements)

References 17 publications

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“…The resonant behavior observed in the real and imaginary parts of the relative permeability of the magnetic thick film can be attributed to the inherent ferromagnetic resonance (FMR) of the magnetic film. Similar observations have been made previously [28,[30][31][32][33]. The FMR frequency can be observed between 3 and 3.5 GHz.…”

Section: High Frequency Performance Of Different Printed Patternssupporting

confidence: 77%

“…Measured permeability value µ r was 81 and loss tangent tan δ was 0.62 at 2.4 GHz frequency. The achieved permeability and loss tangent values were different compared to previous measurements carried out with ink based on cobalt nanoparticles [28], which is caused by higher metal loading of the ink and use of different surfactant and binder material in this work. Figure 11 shows the simulated return loss of the reference and magnetic film loaded patch antennas with varied film thicknesses, respectively.…”

Section: High Frequency Performance Of Different Printed Patternscontrasting

confidence: 41%

“…The width of the upper strip was 5 mm, the distance between the upper and ground plane was 1 mm and the length of the microstrip line was 20 mm. The effective complex permeability of the magnetic thick film was extracted using the SMTLP technique utilizing the measured reflection coefficients of three different samples in the fixture [28]. Measurements were made with the fixture without sample, loaded with a silicon substrate, and the same silicon substrate with a magnetic thick film printed on it.…”

Section: Dielectric Properties Of Magnetic Ink and Related Antenna Stmentioning

confidence: 99%

“…The shorted microstrip transmission-line perturbation (SMTLP) measurement technique was used to determine the complex permeability of the cobalt nanoparticle thick films [28,[30][31][32][33]. A photo of the microstrip fixture loaded with a printed film of the ink is shown in Fig.…”

Section: Dielectric Properties Of Magnetic Ink and Related Antenna Stmentioning

confidence: 99%

“…These methods incorporate the synthesis of cobalt nanoparticles which makes the process more complex and expensive for industrial scale production. Recently, the first research into the formulation of stable cobalt nanoparticle inks by using dry cobalt nanoparticles reacted with surfactant was reported by Nelo et al [28].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Screen Printed Low Curing Temperature Cobalt Nanoparticle Ink for Miniaturization of Patch Antennas

Nelo¹,

Palukuru²,

Juuti³

et al. 2012

PIER

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Abstract-This investigation is one of the first steps towards the realization of low-cost, mass producible, miniaturized antenna solutions utilizing screen printed magnetic thick films of cobalt nanoparticle ink. The ink has a curing temperature lower than 125 • C, feasible printing characteristics and metal loading higher than 85 wt.%. The properties are achieved by using an oxidatively polymerising natural fatty acid, linoleic acid, both as a surfactant and a binder. DSC-TGA-MS-analysis, TEM and SEM microscopies were utilized to investigate ink composition, nanoparticle coating and print quality. The resonant frequency of a microstrip patch antenna was tuned by screen printing of cobalt nanoparticle ink with different layer thicknesses on top of the antenna element. The influence of magnetic layers on resonance frequency, return loss, total efficiency and radiation pattern was measured and compared with a reference antenna without the magnetic films. For example, five layers of magnetic film (52 µm total thickness) tuned the resonance frequency (2.49 GHz) of the patch antenna by 68 MHz. The radiation efficiency of the patch antenna was increased from 39% to 43% by the loading of a 52 µm thick magnetic film compared to the reference antenna. The radiation patterns remained essentially unchanged, despite the presence of the magnetic thick films.

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Section: High Frequency Performance Of Different Printed Patternssupporting

confidence: 77%

Section: High Frequency Performance Of Different Printed Patternscontrasting

confidence: 41%

Section: Dielectric Properties Of Magnetic Ink and Related Antenna Stmentioning

confidence: 99%

Section: Dielectric Properties Of Magnetic Ink and Related Antenna Stmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Utilization of Screen Printed Low Curing Temperature Cobalt Nanoparticle Ink for Miniaturization of Patch Antennas

Nelo¹,

Palukuru²,

Juuti³

et al. 2012

PIER

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Metallic Nanoparticle Inks for 3D Printing of Electronics

Tan

Chua

et al. 2019

Adv Elect Materials

210

100

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Metallic nanoparticle inks are readily obtainable from the commercial market and are commonly used for fabricating conductive tracks and patterns due to their relatively higher electrical conductivity as compared to other types of inks. These metallic nanoparticle inks are made up of electrically conductive metallic nanoparticles suspended in liquid mediums, with particle size ranging from 1 to 100 nm. However, there are also diverse types of metallic nanoparticle inks in the market (for instance, silver nanoparticle inks, gold nanoparticle inks, and copper nanoparticle inks). Metallic nanoparticle inks of different material compositions can directly influence the final electrical, material, and mechanical properties of the printed patterns. This paper presents an overview of the different types of metallic nanoparticle inks used for the 3D printing of electronics. The strengths and weaknesses of each type of ink are critically reviewed. The challenges and potentials of metallic nanoparticle inks in 3D printed electronics are also discussed. Metallic Nanoparticle InksMetallic nanoparticle inks are suspensions of metallic nanoparticles in liquid mediums (see Figure 2a), in which individual metallic nanoparticle is encapsulated in a layer of insulating organic additives and stabilizing agents (see Figure 2b). The encapsulating organic additives and stabilizing agents help prevent the metallic nanoparticles from agglomeration, but at the same time, also impede the flow of electrons from particles to particles. Therefore, sintering processes are required to remove The three-dimensional (3D) printed electronics additive manufacturing industry sector has grown substantially in the past few years, and there is increasing demand for different types of metallic nanoparticle inks in electronics printing for various applications. Metallic nanoparticle inks are commonly used for fabricating conductive tracks and patterns due to their relatively high electrical conductivity as compared to other types of inks, and they can be further categorized into single-element metallic nanoparticle inks, alloy metallic nanoparticle inks, metallic oxide nanoparticle inks, and core-shell bimetallic nanoparticle (BNP) inks. It is critical to gain a deep understanding of the metallic nanoparticle inks used in 3D printed electronics as the material properties of these inks can directly affect the final electrical and mechanical properties of the printed patterns. This review presents an overview of the available metallic nanoparticle inks used for 3D printing of electronics, and critically reviews the strengths and weaknesses of each type of ink. Finally, the challenges of metallic nanoparticle inks in 3D printed electronics are also discussed along with the future outlook for 3D printed electronics.

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Cobalt Nanoparticle Inks for Printed High Frequency Applications on Polycarbonate

Nelo

Myllymäki

Juuti

et al. 2015

Journal of Elec Materi

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In this work the high frequency properties of low curing temperature cobalt nanoparticle inks printed on polycarbonate substrates were investigated. The inks consisted of 30-70 vol.% metallic cobalt nanoparticles and poly (methylene methacrylate) polymer, having excellent adhesion on polycarbonate and a curing temperature of 110°C. The influence of binder material content on the electromagnetic properties of the ink was investigated using the shorted microstrip transmission-line perturbation method. Changes in mechanical properties were evaluated with adhesion tests using the pull-out strength test and the ASTM D 3359-B cross-hatch tape peel test. The microstructure of the printed patterns was investigated with field emission scanning electron microscopy (FESEM). The inks remained mechanically durable with metal contents up to 60 vol.%, achieving pull-off strength of up to 5.2 MPa and the highest marks in adhesion of the tape peel test. The inks obtained a relative permeability of 1.5-3 in the 45 MHz-10 GHz band with a magnetic loss tangent of 0.01-0.06. The developed inks can be utilized in various printed electronics applications such as antenna miniaturization, antenna substrates and magnetic sensors or sensing.

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Formulation of Screen Printable Cobalt Nanoparticle Ink for High Frequency Applications

Cited by 26 publications

References 17 publications

Utilization of Screen Printed Low Curing Temperature Cobalt Nanoparticle Ink for Miniaturization of Patch Antennas

Utilization of Screen Printed Low Curing Temperature Cobalt Nanoparticle Ink for Miniaturization of Patch Antennas

Metallic Nanoparticle Inks for 3D Printing of Electronics

Cobalt Nanoparticle Inks for Printed High Frequency Applications on Polycarbonate

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