On the sintering of solution-based silver nanoparticle thin-films for sprayed and flexible antennas

Bobinger, Marco; Haider, Michael; Goliya, Yash; Albrecht, Andreas; Becherer, Markus; Lugli, Paolo; Rivadeneyra, Almudena; Russer, Johannes A.

doi:10.1088/1361-6528/aae0e0

Cited by 9 publications

(9 citation statements)

References 73 publications

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“…These designs are simulated and optimized in CST Microwave Studio. All antennas were designed based on the material properties of our previous work for solution‐based AgNP antennas, i.e., for a conductivity of 9.4 MS m −1 and a thickness of 237 nm . Polyethylene terephthalate (PET) was selected as a flexible and transparent substrate with great popularity in the industry that offers versatile use.…”

Section: Resultsmentioning

confidence: 99%

“…This reduction in return loss is due to an interference of the connector with the altered antenna geometry that leads to an impedance mismatch and thus an increased reflection of the input signal. However, all return loss parameters are still well below a value of −10 dB, which means that less than 10% of the input signal is reflected . It should be mentioned that, for a comprehensive stress test, the AgNW antenna characteristics have to be tested for repeated bending cycles.…”

Section: Resultsmentioning

confidence: 99%

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Next Generation Antennas Based on Screen‐Printed and Transparent Silver Nanowire Films

Goliya

Rivadeneyra

Salmerón

et al. 2019

Advanced Optical Materials

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decisive drawbacks are (i) only a low to moderate level of scalability, (ii) restrictions for the size as well as the material of the substrate due to high-vacuum processes at elevated temperatures, iii) a lack of mechanical flexibility and iv) optical transparency.A few of these obstacles have been overcome with the emergence of novel materials such as carbon nanotubes (CNTs), graphene, [2] graphene oxide, [3] poly (3,4ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), [4] metal nanomeshes, [5] silver-coated polyester films (AgHT), [6] silver flakes, [7] silver nanoparticles, [8] copper oxide nanoparticles [9] as well as metal nanowires. [10,11] For the majority of these materials, scalable and high-yield synthesis protocols or fabrication techniques exist and these materials can potentially be deposited at almost arbitrary scale and under ambient conditions. Due to the cost-effectiveness, the ease-of-processing and the scalability, deposition methods such as inkjet printing, [12] direct laser writing, [13] spray coating [14] or screen printing [15] have become increasingly popular over the last years and raised academic and industrial interest.A high optical transparency of the deposited films is already a requirement for numerous antenna applications including solar cells, [16] sun shields on satellites, [17] radio-identification tags (RFIDs), [18][19][20][21] smart glasses, [22] bandstop filters to reduce the interference from wireless local area networks (WLANs) [23] as well as for energy harvesting. [24,25] Due to this broad application spectrum and the commercialization potential, notable technology companies including the so-called Big Techs, have recently filed several patents related to transparent conductive films and their use for antennas. [26][27][28] The conducting and transparent films presented in this work were made of a commercially available silver nanowire (AgNW)-based screen print paste. The use of screen printed AgNWs for antennas has already been reported in 2014 by Song et al. [29] However, in that work, the antenna films were fully opaque, which is a criterion for exclusion in many applications. In this work, as transparent electrode (TE) material, AgNWs were selected since this material is currently considered as the most promising alternative to the prevailing TE material, i.e., indium tin oxide (ITO), [30] with regard to the electro-optical performance as well as the chemical and the mechanical stability. [31] The antennas presented in this work show a highThe advent of mobile communication has made antennas omnipresent. Conventional methods of antenna manufacturing cannot address the growing demands for novel applications requiring transparent and flexible antennas. In this paper, transparent silver nanowire films are studied with respect to their highfrequency properties. Transparent silver nanowire (AgNW)-based antennas that are screen printed onto flexible polyethylene terephthalate (PET) substrate are reported. Transparent films with a low sheet resistance of 8.5 Ω sq −...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Next Generation Antennas Based on Screen‐Printed and Transparent Silver Nanowire Films

Goliya

Rivadeneyra

Salmerón

et al. 2019

Advanced Optical Materials

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“…The advantages are remarkable: the heat treatment takes place in milliseconds, producing minimal damage to low-temperature substrates and avoiding unwanted processes (diffusion) [42]. FLA was employed in different kind of applications ranging from thin-film transistors [44], solar cells [45], antennas [46], RFID components [47,48] to wearable devices [49], using conductive, bioresorbable or ceramic inks (silicon, silver, zinc) on different kind of substrates (wood, cardboard, textiles, glass, polymers) [50,51].…”

Section: Introductionmentioning

confidence: 99%

Printed Smart Devices on Cellulose-Based Materials by means of Aerosol-Jet Printing and Photonic Curing

Serpelloni

Cantù

Borghetti

et al. 2020

Sensors

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Printed electronics is an expanding research field that can reach the goal of reducing the environmental impact on electronics exploiting renewable and biodegradable materials, like paper. In our work, we designed and tested a new method for fabricating hybrid smart devices on cellulose substrates by aerosol jet printing (AJP) and photonic curing, also known as flash lamp annealing (FLA), capable to cure low temperature materials without any damage. Three different cellulose-based materials (chromatographic paper, photopaper, cardboard) were tested. Multilayer capability and SMDs (surface mount devices) interconnections are possible permitting high flexibility in the fabrication process. Electrical and geometrical tests were performed to analyze the behavior of printed samples. Resulted resistivities are 26.3 × 10−8 Ω⋅m on chromatographic paper, 22.3 × 10−8 Ω⋅m on photopaper and 13.1 × 10−8 Ω⋅m on cardboard. Profilometer and optical microscope evaluations were performed to state deposition quality and penetration of the ink in cellulose materials (thicknesses equal to 24.9, 28.5, and 51 μm respectively for chromatographic paper, photopaper, and cardboard). Furthermore, bending (only chromatographic paper did not reach the break-up) and damp environment tests (no significant variations in resistance) where performed. A final prototype of a complete functioning multilayer smart devices on cellulose 3D-substrate is shown, characterized by multilayers, capacitive sensors, SMDs interconnections.

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“…The AgNW@rGO networks exhibited a smooth surface after 385 nm laser irradiation because the silver nanoparticles with a low melting point should undergo a fast melting and then solidifying process. 54,55 Generally, the surface plasmon resonance will be excited by incident EM waves for various metal nanostructures. 56 By measuring the transmission spectrum of our AgNW networks (Figure S2c), we found a characteristic absorption band of the AgNWs in the 350−400 nm range.…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide Conformally Wrapped Silver Nanowire Networks for Flexible Transparent Heating and Electromagnetic Interference Shielding

et al. 2020

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Metal nanowire networks (MNNs) are promising as transparent electrode materials for a diverse range of optoelectronic devices and also work as active materials for electrical heating and electromagnetic interference (EMI) shielding applications. However, the relatively low performance and poor durability of MNNs are limiting the practical application of the resulting devices. Here, we report a controllable approach to enhance the conductivity and the stability of MNNs with their transmittance remaining unchanged, in which reduced graphene oxide conformally wrapped silver nanowire networks (AgNW@rGO networks) are synthesized by selective electrodeposition of GO nanosheets on AgNWs followed by a pulsed laser irradiation treatment. Experimental characterizations and finite-difference time-domain simulations indicate that pulsed laser irradiation at a specific wavelength not only reduces the GO but also welds the AgNWs together through a surface plasmon resonance process. As a result, the AgNW@rGO networks exhibit low sheet resistance of 3.3 Ω/□, average transmittance of 91.1%, and good flexibility. Wrapping with rGO improves the maximum electrical heating temperature of the AgNW network transparent heaters due to the effective suppression of the oxidation and the migration of surface silver atoms. In addition, excellent EMI shielding effectiveness of up to 35.5 dB in the 8.2−12.4 GHz frequency range is obtained as a consequence of the combined effects of dual reflection, conduction loss, and multiple dielectric polarization relaxation processes.

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On the sintering of solution-based silver nanoparticle thin-films for sprayed and flexible antennas

Cited by 9 publications

References 73 publications

Next Generation Antennas Based on Screen‐Printed and Transparent Silver Nanowire Films

Next Generation Antennas Based on Screen‐Printed and Transparent Silver Nanowire Films

Printed Smart Devices on Cellulose-Based Materials by means of Aerosol-Jet Printing and Photonic Curing

Reduced Graphene Oxide Conformally Wrapped Silver Nanowire Networks for Flexible Transparent Heating and Electromagnetic Interference Shielding

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