Fabrication of conductive paths on a fused deposition modeling substrate using inkjet deposition

Zhou, Wenchao; List, F.A.; Duty, Chad; Babu, S. S.

doi:10.1108/rpj-05-2014-0070

Cited by 16 publications

(7 citation statements)

References 45 publications

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“…[41,42] The advantages of FDM/inkjet hybrid approaches have already been noted for integration of conductive paths. [43][44][45] Both direct-write technologies are already scalable, suitable for fabricating structures with hundreds of layers, and have well-understood formulation and filament/ink requirements. [37][38][39][40]46,47] The work here using standard materials and techniques to fabricate OECTs and to demonstrate neuromorphic behavior demonstrates a clear path for translation to more complex structures and devices that can then progress to applications in bioelectronics.…”

Section: Discussionmentioning

confidence: 99%

Hybrid 3D/Inkjet‐Printed Organic Neuromorphic Transistors

Mangoma

Yamamoto

Malliaras

et al. 2020

Adv Materials Technologies

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components. [1] They consist of an organic semiconductor thin film patterned between two electrodes, the source and the drain. The semiconductor thin film is in contact with an electrolyte in which a gate electrode is immersed. With application of a gate voltage (V G ), ions from the electrolyte enter the semiconductor, changing its doping state and conductivity, which in turn changes the current that flows between the source and the drain (drain current, I D ). [2] This volumetric doping mechanism is highly efficient, leading to large changes in I D for small changes in V G . As a result, OECTs show very high transconductance (g m = ∂I D /∂V G ), which is a parameter that governs signal amplification. [3] The response time, however, for OECTs is typically quite slow, as ions must penetrate through the entire film. [4] This combination of characteristics makes OECTs suitable for applications in bioelectronics and some areas of large-area electronics, most notably printable electronics. [1,5,6] Recently, the characteristics of OECTs have also led to them being explored as neuromorphic devices. [7,8] These are devices that emulate processing functions observed in biological neural networks and are being developed for computing systems that consume less power and overcome the von Neumann performance bottleneck. [9] An identifying characteristic of biological neural networks is that storage and processing of information is co-located on the same unit. [10] One manifestation of this is Hebbian learning, according to which synaptic connections become more efficient upon repeated stimulation of the postsynaptic by the pre-synaptic neuron (neurons that fire together wire together). [11] This property can be captured in OECTs, when repeated voltage pulses at the gate (the equivalent of the pre-synaptic input) lead to ion accumulation in the semiconductor, thereby have a cumulative effect on the drain current (the post-synaptic output). Leve raging this property, processing functions including synaptic plasticity, orientational selectivity, and homeoplasticity have been demonstrated with OECTs. [7,12,13] Photolithography is still by far the most commonly reported approach for fabricating OECTs. [3,[14][15][16][17] However, the simple structure of OECTs and the ease of formulation of organic materials into different material formats have enabled fabrication using a variety of manufacturing techniques, such as screen printing, spin coating, inkjet printing, and gel extrusion. [18][19][20][21][22] Photolithography is highly efficient, with excellent yields, high achievable resolution, and scalability, but in research and also low-volume, late-stage manufacturing, there is often a greater Organic electrochemical transistors (OECTs) are proving essential in bioelectronics and printed electronics applications, with their simple structure, ease of tunability, biocompatibility, and suitability for different routes to fabrication. OECTs are also being explored as neuromorphic devices, where they emulate characteristics of biologica...

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Section: Discussionmentioning

confidence: 99%

Hybrid 3D/Inkjet‐Printed Organic Neuromorphic Transistors

Mangoma

Yamamoto

Malliaras

et al. 2020

Adv Materials Technologies

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“…Their studies suggested the irregular surface of the 3D printed substrate led to discontinuity of the inkjet printed pattern and consequently poor conductivity. To improve the continuity of the inkjet printed tracks, they explored two methods: by applying heat and pressure to “iron” the surface and by using a heated metal tip to “plow” a channel to contain the ink (Zhou et al , 2016).…”

Section: Drop Impact Footprint and Resolutionmentioning

confidence: 99%

Inkjet and inkjet-based 3D printing: connecting fluid properties and printing performance

Guo

Patanwala

Bognet

et al. 2017

RPJ

181

111

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Purpose-This paper aims to summarize the latest developments both in terms of theoretical understanding and experimental techniques related to inkjet fluids. The purpose is to provide practitioners a self-contained review of how the performance of inkjet and inkjet-based three-dimensional (3D) printing is fundamentally influenced by the properties of inkjet fluids. Design/methodology/approach-This paper is written for practitioners who may not be familiar with the underlying physics of inkjet printing. The paper thus begins with a brief review of basic concepts in inkjet fluid characterization and the relevant dimensionless groups. Then, how drop impact and contact angle affect the footprint and resolution of inkjet printing is reviewed, especially onto powder and fabrics that are relevant to 3D printing and flexible electronics applications. A future outlook is given at the end of this review paper. Findings-The jettability of Newtonian fluids is well-studied and has been generalized using a dimensionless Ohnesorge number. However, the inclusion of various functional materials may modify the ink fluid properties, leading to non-Newtonian behavior, such as shear thinning and elasticity. This paper discusses the current understanding of common inkjet fluids, such as particle suspensions, shear-thinning fluids and viscoelastic fluids. Originality/value-A number of excellent review papers on the applications of inkjet and inkjet-based 3D printing already exist. This paper focuses on highlighting the current scientific understanding and possible future directions.

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“…It is highly possible, however, that some of them will gain in commercial interest. Currently, screen printing dominates commercial printed electronics, which can be attributed to its increased use in manufacturing displays and sensors [115,116]. Inkjet printing and high-volume flexography and gravure printing are moving from R&D to pilot and, to some extent, to commercial product manufacturing [115].…”

Section: Conclusion and Future Perspectivementioning

confidence: 99%

Printable conductive inks used for the fabrication of electronics: an overview

Dimitriou

Michailidis

2021

Nanotechnology

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In recent years, a wide range of electronic materials with a great diversity in their chemical and physical properties has been patterned by printing techniques on a variety of substrates. Nanotechnology-based materials appear to be the most promising thereof, increasing the resolution of the printed raster and enhancing the electrical properties of the final patterns. Conductive nanoparticle inks are the main building block of all printed electronic devices and circuit boards, forming their fundamental structure and integrated low-resistance circuit interconnects, antennae, contact electrodes within transistors etc. A plethora of both conventional and novel printing techniques have been employed with nanoparticle-based inks for the fabrication of conductive patterns, dictating different limitations for the properties of the printed inks. Although several articles have reviewed printing techniques of nanomaterials, a comprehensive review on physicochemical properties that need to be considered in order to develop nanoparticle-based conductive inks, sufficiently compatible with each printing technique, is missing. This review firstly summarizes a wide range of printing techniques that are of high potential for printing electronics and then narrows them down to those applied with conductive nanoparticle inks. Next, it focuses on the typical properties of nanoparticle-based conductive inks (chemical composition, particle size and shape, solids loading, ink viscosity and surface tension) and suggests parameters that need to be taken into account when preparing conductive nanotechnology-based inks, corresponding the requirements of each printing technique. General principles that determine the electrical conductivity of the printed patterns are outlined. Lastly, future prospects on the development of novel printable materials are laid out.

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Fabrication of conductive paths on a fused deposition modeling substrate using inkjet deposition

Cited by 16 publications

References 45 publications

Hybrid 3D/Inkjet‐Printed Organic Neuromorphic Transistors

Hybrid 3D/Inkjet‐Printed Organic Neuromorphic Transistors

Inkjet and inkjet-based 3D printing: connecting fluid properties and printing performance

Printable conductive inks used for the fabrication of electronics: an overview

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