![]() ![]() There is a wide range of conductive inks, dyes and pastes available on the market, which can be used to deposit conductive pathways in the AM production of circuits. The AM method chosen, and the conductive materials used, will have a direct impact on the quality, efficiency, and scalability of the resulting electronic circuit. These materials may be deposited layer by layer in a manner similar to that of three-dimensional printing, to create a monolithic circuit of unorthodox geometries or they may be deposited onto an existing substrate, transforming it into an electronic circuit. In AM, the electronic circuit is produced from the bottom up via the selective deposition or growth of conductive and dielectric materials ( Espera et al., 2019). These processes allow the design of electronic circuits that would be impossible to produce by classical PCB method.Īdditive manufacturing (AM) provides one such alternative to the subtractive fabrication process. To keep up with the demands of the ever-advancing industry, new manufacturing processes have been developed. However, the conventional, subtractive method of electronic circuit production - selectively removing copper from printed circuit boards (PCBs) ( Mosses and Brackenridge 2003) - is both inefficient and environmentally unfriendly ( Espera et al., 2019). ![]() Such applications have accelerated the ever-growing need for circuits to become smaller, lighter, and more efficient. Innovations in the fields of electronics, robotics and the “internet of things” (“IOT”) have pushed the boundaries of imagination. Nevertheless, the observed enhanced conductivity and the ability to control the composite’s morphology by functionalization allow fine-tuning of morphology-based properties, such as surface enhanced Raman scattering and optimization of the ink for sensing applications. This “double-edged sword” effect of functionalization results in the highest absolute specific conductivity (3.79 × 10 3 S/m) achieved by decorating pristine CNTs with 25 wt% of silver. However, CNT functionalization severely damages the conductivity of the CNTs themselves, resulting in a much lower conductivity. Electrical characterization of the silver-decorated CNT-based ink shows a more significant improvement in conductivity of the functionalized CNTs-decorated with silver compared to the pristine one (maximal ∼40 and ∼20% increase in conductivity over their undecorated counterpart, respectively). We show a correlation between functionalization and the size of the resulted NPs: the diameter of the silver NPs deposited on pristine CNTs (∼5 nm diameter) is third of that of NPs deposited on functionalized CNTs (∼15 nm). Optimizing conductive ink for Direct-Write Additive Manufacturing, this work explores the effect of carboxylic functionalization of multi-walled carbon nanotubes on their affinity to silver nanoparticles deposited on them. Department of Materials Science and Engineering, Tel-Aviv University, Tel-Aviv, Israel.“They have been a great partner for SWeNT, helping us serve the research market and supporting early stages of development for commercial markets with our line of high-purity carbon nanotube products, produced using the patented CoMoCAT process. “Sigma-Aldrich is widely recognized around the world as a world-class supplier of high quality materials,” says Dave Arthur, CEO of SWeNT. The SWeNT CG200 is a single-wall, large-diameter CNT with a high metallic tube content, offering higher electrical conductivity. SMW can reduce or eliminate this compromise at a fraction of the cost of single-wall CNTs. ![]() However, this electrical conductivity benefit often results in mechanical properties being compromised compared with the unfilled polymer. Traditional multi-wall CNT products are typically used as a conductive additive for thermoplastic polymers, enabling molded plastic parts to be electrically conductive and provide electrostatic discharge (ESD) protection. Target applications for SMWä materials include conductive polymers, lithium-ion batteries and materials for structural composite manufacturing. This new SWeNT SMW100 material was developed for applications that require significantly better electrical and mechanical performance than can be achieved with conventional multi-wall CNT, without the cost or dispersion difficulties associated with single-wall CNTs. The items added to the Sigma-Aldrich offering include SWeNT SMW100 Specialty Multi-Wall CNT and CG200. ![]()
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