UV-Cured Acrylic Conductive Inks for Microelectronic Devices (original) (raw)
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Current technology, Inkjet is an accepted technology for dispensing small volumes of material (50 -500 picolitres). Currently traditional metal-filled conductive adhesives cannot be processed by inkjetting (owing to their relatively high viscosity and the size of filler material particles). Smallest droplet size achievable by traditional dispensing techniques is in the range of 150 µm, yielding proportionally larger adhesive dots on the substrate. Electrically conductive inks are available on the market with metal particles (gold or silver) <20 nm suspended in a solvent at 30-50%. After deposition, the solvent is eliminated and electrical conductivity is enabled by a high metal ratio in the residue. Some applications include a sintering step. These nano-filled inks do not offer an adhesive function. Work reported here presents materials with both functions, adhesive and conductive. This newly developed silver filled adhesive has been applied successfully by piezo-inkjet and opens a new dimension in electrically conductive adhesives technology.
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This work reports the formulation of waterbased graphene oxide/acrylic nanocomposite inks, and the structural and electrical characterization of test patterns obtained by inkjet direct printing through a commercial piezoelectric micro-fabrication device. Due to the presence of heavily oxygenated functional groups, graphene oxide is strongly hydrophilic and can be readily dispersed in water. Through a process driven by UV irradiation, graphene oxide contained in the inks was reduced to graphene during photo-curing of the polymeric matrix. Printed samples of the nanocomposite material showed a decrease of resistivity with respect to the polymeric matrix. The analysis of the influence of printed layer thickness on resistivity showed that thin layers were less resistive than thick layers. This was explained by the reduced UV penetration depth in thick layers due to shielding effect, resulting in a less effective photo-reduction of graphene oxide.
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Currently, silver nanoparticles have attracted large interest in the photonics, electrics, analytical, and antimicrobial/biocidal fields due to their excellent optical, electrical, biological, and antibacterial properties. The versatility in generating different sizes, shapes, and surface morphologies results in a wide range of applications of silver nanoparticles in various industrial and health-related areas. In industrial applications, silver nanoparticles are used to produce conductive inks, which allows the construction of electronic devices on low-cost and flexible substrates by using various printing techniques. In order to achieve successful printed patterns, the necessary formulation and synthesis need to be engineered to fulfil the printing technique requirements. Additional sintering processes are typically further required to remove the added polymers, which are used to produce the desired adherence, viscosity, and reliable performance. This contribution presents a revie...
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IOP Conference Series: Materials Science and Engineering
Printed electronics technology is one of the most dynamic in the world, allowing for the low-cost fabrication of electronic networks on textile substrates using the inkjet printing technique which is commonly used in various industries. In the field of formulation of conductive inks, silver nanoparticles are generally used as precursors that confer electrical conductivity to the printed patterns. In the present work, we synthesized silver nanoparticles by an ecological reduction method and then dispersed them in a PEG/Glycerol mixture to prepare a conductive ink. The silver nanoparticles were characterized by X-ray diffraction (XRD), as well as the morphology of the printed silver tracks was characterized by SEM. The developed ink was then successfully printed on a piece of pre-treated cotton fabric to produce flexible electronic components on the textile.
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Kwi Jong Lee, et al., “Direct synthesis and inkjeting of silver nanocrystals toward printed electronics'. Institute of Physics Pub lishing, Nanotechnology 17 (2006), pp. 2424-2428. Kwi Jong Lee, et al., “Environmentally friendly synthesis of organic soluble silver nanoparticles for printed electronics', IPO Publishing, Nanotechnology 18 (2007), pp. 1-5. Kwi Jong Lee, et al., “Direct synthesis and bonding orgins of monolayer-protected silver nanocrystals from silver nanocrystals from silver nitrate through in situ ligand exchange'. Journal of Col loid and Interface Science 304 (2006), pp. 92-97.