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Flexible Sensors for Biomedical Applications Based on Elastic Polymers
Published in Sam Zhang, Materials for Devices, 2023
Hui Li, Jing Chen, Lin Li, Lei Wang
Inkjet printing is a rapid direct patterning technique via liquid phase material deposits on substrate, which simplifies the processing steps as well as reduces the manufacturing cost. During the inkjet printing, the print head moves following the programmed trajectory and tiny droplets of ink are propelled through a micrometer-sized nozzle head. Many materials can be used as ink for printing; it greatly expands the scope of the use of this method. Thus, plenty of hybrid pressure sensors can be prepared by inkjet printing.
Carbon-Based Materials for Microsupercapacitors
Published in Swamini Chopra, Kavita Pande, Vincent Shantha Kumar, Jitendra A. Sharma, Novel Applications of Carbon Based Nano-Materials, 2023
Alisha Nanwani, Abhay D. Deshmukh
Inkjet printing is a simple and high uptake method, which can simultaneously perform deposition and patterning, reducing the usage of material and process complexity. Inkjet printing can achieve computer printing, which prints a pattern by propelling ink droplets on paper, plastic, and other substrates. As the printing process is efficient and versatile to integrate planar MSCs to random connections and any scale. Large-scale fabrication of MSC arrays of more than 100 devices on a single Si wafer and flexible substrate (Kapton) are manufactured. Inkjet printing is one of the most reliable techniques due to its advantages, such as high resolution (down 50 micro-meter), scalability, cost-efficient, direct printing, low material consumption, and control on thickness. Also, the printing process is compatible with most of the materials due to which all printed MSC can be realized, which improves the scalability and resolution of the device as no manual assembly step is required for further device processing. For example, Pech et al. prepared an ink of activated carbon with PTFE as a binder in ethylene glycol with a stabilizing surfactant. This material was deposited on patterned gold as a current collector with a substrate temperature of about 140°C to maintain homogeneity. A variety of supercapacitors were designed with the width of microelectrodes varying from 40-100 µm (Yun et al. 2017).
Inkjet Printing of Catalytic Materials
Published in Klaus D. Sattler, st Century Nanoscience – A Handbook, 2019
Petros G. Savva, Costas N. Costa
Inkjet printing is a type of computerized printing that creates a “hard-copy” image, from a digital version, by driving droplets of ink onto a specific area of a substrate by producing drops from a tank with minimal human involvement (Ko et al., 2007). Practically, there is no limitation as to the type of the substrate. The substrate can be either flexible or rigid. The concept of inkjet printing originated in the 20th century, and the technology was first extensively developed in the early 1950s. This technique has recently attracted increasing interest as a flexible, cost-effective, and reliable method for micro- and nano-fabrication, with plentiful practical applications (Haverinen et al., 2010). Despite its many advantages, the primary cause of inkjet printing problems is considered to be ink drying on the printhead’s nozzles, causing the micro- or nanoparticle solutions to dry out and precipitate in the form of a solid block of hardened mass that plugs the microscopic ink passageways. In addition, inkjet printing has also the disadvantage of complex drying behavior to form uniform printed films (Atasheh, 2016). Therefore, the preparation of inkjet inks has attracted much interest and is often the most challenging task for researchers. Table 14.1 shows the main characteristics, requirements, and challenges of inkjet printing.
The effect of weave structure on the quality of inkjet polyester printing
Published in The Journal of The Textile Institute, 2019
Abbas Hajipour, Ali Shams Nateri
Digital textile printing was appeared in the 1990s as a prototyping tool and instrument for printing of small batches of fabric, flag and banner (Savvidis, Karanikas, Nikolaidis, Eleftheriadis, & Tsatsaroni, 2014). In conventional digital textile printing, the images are printed directly on the fabric which is composed of tiny droplets of four or more inks (Aldib, 2015; Hwang, Kim, & Chan, 2015; Mikuž, Turk, & Tavčer, 2010). Inkjet printing technology offers a lot of advantages over the traditional printing methods such as flexibility, creativity in design patterns, simplicity, low effluent waste, less production cost, lower use of energy and water, quick respond to the increase demands of short runs and print quality (Kan, Yuen, & Tsoi, 2011; E. Karanikas, Nikolaidis, & Tsatsaroni, 2013; Kosolia, Varka, & Tsatsaroni, 2011; Liu, Fang, Gao, Liu, & Zhang, 2016; Mikuž et al., 2010; Wang & Wang, 2010). Hence, it is expected that the traditional printing techniques such as flat or rotary screen-printing and roller-printing may be replaced by digital printing technologies in the near future (Soleimani Gorgani, & Shakib, 2013).
Recent advances in printable carbon nanotube transistors for large-area active matrices
Published in Journal of Information Display, 2021
Kevin Schnittker, Muhammadeziz Tursunniyaz, Joseph B. Andrews
Inkjet printing is a drop-on-demand technique, where material inks are deposited onto substrates with the help of the piezoelectric response of nozzle heads. Inkjet printing systems are highly sensitive to the viscosity of the material inks due to the capillary mechanism of deposition. However, the technique is efficient in printing large-area electronics with decent patterning accuracy. The key printing parameters for inkjet printing are the ink viscosity and the surface tension, drop spacing, jetting voltage, drop speed, and platen temperature. Matching the ink fluid properties with the surface properties of the substrate is critical for successful printing [60]. A schematic of inkjet printing CNT-TFTs is shown in Figure 4B.
Graphene in wearable textile sensor devices for healthcare
Published in Textile Progress, 2022
Md Raju Ahmed, Samantha Newby, Wajira Mirihanage, Prasad Potluri, Anura Fernando
Today, inkjet printing has become one of the most popular methods for printing flexible devices; especially where there needs to be a high level of accuracy and precision without using a physical printing mask (Capasso et al., 2015). Inkjet printing involves the accurate ejection of ink droplets, which are usually micro-sized or even nano-sized, onto the substrate for the desired printing patterns (Singh, Haverinen, Dhagat, & Jabbour, 2010). The generation of droplets is done by either piezoelectric excitation or thermal application (Calvert, 2001). Then the droplets are driven by electrostatic force and are triggered selectively after reaching the nozzle for the correct deposition onto the substrate (Krebs, 2009). The most straightforward and fundamental graphene ink formation involves the dispersion of GO and rGO into suitable solvents or water for printing. A number of inks based on pristine graphene (Gao et al., 2014; Majee, Song, Zhang, & Zhang, 2016; Secor, Prabhumirashi, Puntambekar, Geier, & Hersam, 2013) and graphene-based hybrid inks (L. Li, Sollami Delekta, et al., 2017; G. Wang et al., 2015; Xu et al., 2014) have been successfully used in inkjet printing with excellent results. The simple process can end in a resolution up to ∼2 µm being obtained (Sekitani, Noguchi, Zschieschang, Klauk, & Someya, 2008). Several researchers have emphasised the necessity of fluidic characteristic modification for graphene and graphene-based inks as they play a vital role in the quality of the printed patterns. The most fundamental fluidic characteristics are a high surface tension, ∼35 mN·m−1, and low viscosity, 0.004–0.03 Pa·s. The homogeneity of graphene ink dispersion is also an important criterion during inkjet printing. Li et al. reported an inkjet printing method for scalable fabrication of micro-supercapacitors using graphene-based ink (J. Li, Sollami Delekta, et al., 2017). In their research, electrochemically exfoliated and highly-concentrated graphene was prepared by using a solvent exchange technique. The resulting print had a thickness of ∼0.7 µm and the patterns were usable for both circuits and electrodes.