Surface Charge Reversal Method for High‐Resolution Inkjet Printing of Functional Water‐Based Inks

Abstract

wileyonlinelibrary.comlight-emitting diode (OLED) displays, printed organic solar cells, fl exible batteries, logic and memory components including organic fi eld-effect transistors and thin-fi lm transistors, fl exible displays, sensor arrays, radio frequency identifi cation tags, and superconducting tapes. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] To cite one recent outstanding application, the Panasonic Corporation unveiled in December 2013 a 56 in. 4K (high-pixel density) organic-inorganic hybrid OLED TV, where all the organic materials were deposited using IJP methods.This hybrid TV exhibits properties that are not easily achievable with either organic or inorganic materials alone, such as the best image quality ever, high contrast, fast response rate, high energy efficiency, and with the advantages of being ultrathin and lightweight. [ 16,19 ] Clearly, the manufacture of both organic and inorganic materials using IJP constitutes the next step toward a new generation of advanced materials and modern electronic devices, with a potential multibillion dollar market in the near future. [ 20 ] Therefore, considerable attention has been directed mostly toward the optimization of metal-organic inks, compatible with IJP technology, containing a single metal for direct metallization. [21][22][23][24][25][26][27] Such inks are already commercially available as a consequence of a huge global market desiring cheap inorganic conducting grids.However, the obtaining of sophisticated hybrid inks blending several metal-organic complex raw materials (HMOC) compatible with both the printer and the substrate is still being researched, and this approach is directly linked to the novel capabilities associated with the use of chemical solution deposition (CSD) to prepare self-assembled complex oxide nanostructures and multilayers under mild processing conditions. [28][29][30][31][32][33][34][35][36][37][38][39][40] Achieving the desired composition and the optimum rheological properties, together with the stabilization of several chemical bonds between organic and inorganic molecules, are critical issues during the manufacture of HMOC inks compatible with IPJ technology. In addition, the difference between the ink surface tension (ST) and the surface energy of a hydrophobic substrate has a profound effect on the adhesive strength of the complex linkages between the fl uid and the substrate, causing the ink drop to spread out or stop off during the drying process. [ 41 ] It is, therefore, highly desirable to develop a process Printed electronics is a rapidly growing area of research being explored for the manufacture of large-area and cost-effective electronic devices by the patterned application of functional inks. There are challenges associated with processing the inks compatible with inkjet printing technology and developing effi cient methods to successfully obtain the desired features, particularly when it comes to metal and metal-organic complex inks. Here, a reliable method is developed to achieve a so...

Nucleophilic stabilization of water-based reactive ink for titania-based thin film inkjet printing

“…Research on inkjet printing of metal nanoparticles [ [9]] and carbonaceous materials [ [10]] have also been conducted. Such a rapid development is mainly due to its unique advantage of enabling a precise and selective deposition of materials into different architectures (thin films, 2D and 3D structures) with a very high resolution and minimal waste of materials [11][12][13][14]. The inkjet printing owns the further merits of being a low cost technique based on inks that can be easily formulated to be environmentally friendly.…”

High Performance of Superconducting YBa2Cu3O7 Thick Films Prepared by Single-Deposition Inkjet Printing

“…Owing to the strong dependence of the critical film thickness for crack generation with the tensile stress (t c ∝ 1/σ 2 , eq 3), some increase in t c should be expected when σ is decreased as it is indeed observed when films with different nominal final thicknesses are prepared. 52,53 Figures 6a,b shows OM images and the corresponding thickness map of pyrolyzed films with the largest thickness achieved so far with a single IJP deposition (∼2000 nm after pyrolysis) (Figure 6a). Figure 6b shows a film where cracks start to form in the central part of the film where thickness is larger.…”

Quantum Dots Synthesis Through Direct Laser Patterning: A Review

“…Both characteristics contribute to lower the production costs especially for small batches. On the other side the challenges faced by ink jet printing rely on the development of suitable inks that avoid the nozzle clogging, the solvent evaporation (coffee ring effect) (Jiang et al, 2016) and improve the adhesion to the substrate (Cobas et al, 2015). The IJP is a simpler technology with respect to contact transfer and photolithography but on the other side its resolution is poorer (10–20 μm) (Menard et al, 2007) (Table 1).…”