The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Ulrich S Schubert - One of the best experts on this subject based on the ideXlab platform.

  • Inkjet Printing of organic electronics comparison of deposition techniques and state of the art developments
    Journal of Materials Chemistry C, 2013
    Co-Authors: Anke Teichler, Jolke Perelaer, Ulrich S Schubert
    Abstract:

    Inkjet Printing represents a solution dispensing technique that is characterized by its non-contact, material-efficient and reproducible processing. This critical review discusses the use of Inkjet Printing for organic electronics with a focus on the applicability as well as the drying behavior. The nascent Inkjet Printing technique is compared to commonly used solution deposition methods, like spin-coating and doctor blading. Basic drying principles of Inkjet printed features are understood and fundamental correlations between processing properties and film characteristics can be drawn. It is, however, a long way to gain a full understanding of the complete drying process, since the process conditions as well as the ink properties correlate in a complex relation with the final device properties. Nevertheless, Inkjet Printing has the potential to evolve as one of the most promising film preparation techniques in the future and has already been applied successfully in combinatorial screening workflows and for the preparation of organic solar cell devices.

  • combinatorial screening of polymer fullerene blends for organic solar cells by Inkjet Printing
    Advanced Energy Materials, 2011
    Co-Authors: Anke Teichler, Stephanie Hoeppener, Rebecca Eckardt, Christian Friebe, Jolke Perelaer, Alessia Senes, Mauro Morana, Christoph J Brabec, Ulrich S Schubert
    Abstract:

    Polymer:fullerene blends were screened in a combinatorial approach using Inkjet Printing thin film libraries for photovoltaic devices. The application of Inkjet Printing enabled a fast and simple experimental workflow from film preparation to the study of structure-property-relationships with a very high material efficiency. Inkjet Printing requires less material for the preparation of thin film libraries in comparison to other dispensing techniques, like spin-coating. Two polymers (PCPDTBT, PSBTBT) and two fullerene derivatives (mono-PCBM, bis-PCBM) were investigated in various blend ratios, concentrations, solvent ratios, and film thicknesses. Morphological and optical properties of the Inkjet printed films were investigated and compared with spin-coated films. This study shows the principle of an experimental setup from solution preparation to film characterization for the combinatorial investigation of large polymer:fullerene libraries.

  • Inkjet Printing as a deposition and patterning tool for polymers and inorganic particles
    Soft Matter, 2008
    Co-Authors: Emine Tekin, Patrick Smith, Ulrich S Schubert
    Abstract:

    Inkjet Printing is an attractive patterning technology, which has become increasingly accepted for a variety of industrial and scientific applications. This review primarily presents an overview of the investigations that have been conducted since 2003 into Inkjet-Printing polymers or metal-containing inks and mentions related activities. The first section discusses the droplet-formation process in piezoelectric drop-on-demand printheads and the physical properties that affect droplet formation and the resolution of Inkjet-printed features. The second section deals with the issues that arise from Printing polymers, such as printability and the output characteristics of devices made by this route. Finally, the challenges and achievements attached to Inkjet Printing metal-containing inks are discussed before concluding with a few remarks about the future of the field.

  • Inkjet Printing of narrow conductive tracks on untreated polymeric substrates
    Advanced Materials, 2008
    Co-Authors: Van Thj Thijs Osch, Ulrich S Schubert, Jolke Perelaer, De Laat
    Abstract:

    In the last two decades Inkjet Printing has grown to a major topic in scientific research, especially drop-on-demand (DOD) Inkjet Printing systems. DOD Inkjet Printing has progressed from Printing text and graphics, where it started originally, to a tool for (rapid) manufacturing technology. During the last years, the fabrication of narrow conductive tracks by methods of Inkjet Printing has been investigated extensively. Printing of flexible electronics and minimizing their feature size dramatically lowers the production costs of electronic devices, because material can be positioned on-demand, which reduces the amount of necessary material. The main bottleneck in Inkjet-printed features on flexible (polymeric) substrates is the low softening point (Tg) of the substrate, which limits the processing temperature. The Tg of commonly used polymeric substrates, like poly(ethylene terephtalate) (PET) or polycarbonate (PC), is below 150 °C. Typically, colloidal suspensions of conductive materials need a sintering temperature of > 200 °C, which is, hence, not compatible with most polymeric substrates. Feasible products of flexible electronics include, for example, interconnections for circuitry on a printed-circuit board (PCB), electrodes for thin-film transistor (TFT) circuits, organic light-emitting diodes (OLEDs), or disposable displays and radio frequency identification (RFID) tags. Furthermore, Printing largearea displays is also a possibility. The typical dimensions of Inkjet-printed features depend on the nozzle diameter, and are usually not below 100 lm. The most obvious way to minimize the feature size, that is, line width, is by reducing the nozzle diameter. However, this introduces a narrow window with respect to surface tension and viscosity of the inks, and thereby limits the choice of inks that can be printed. Furthermore, when Printing suspensions the particles should be sufficiently smaller than the nozzle diameter; otherwise nozzle clogging occurs. When using piezoelectric-based DOD Inkjet printers, smaller droplets can also be produced by modifying the waveform. Much research has been done to predefined (surface energy) patterns on a substrate that forces material to remain in a preferred area on the surface. These techniques rely on the use of expensive masks and conventional photolithography, which increases production costs. Here we present a method to produce narrow conductive silver tracks without prepatterning or modifying the surface energy of the substrate. Preferably, the surface energy should not be too low, because Printing on such foils introduces bulges into the printed features, for example with poly(tetrafluorethylene) (PTFE) foils. Line-bulging is an unwanted mechanism that locally broadens the printed structures, as can be seen on the left-hand side of Figure 1. Commonly used polymeric substrates, like PET or polyimide (PI), have a high surface energy, shown on the right-hand side in Figure 1. Although Printing on these substrates leads to continuous and straight lines, broad lines are obtained over the whole printed feature, owing to the relatively good wetting of the solvent with the substrate. Clearly, an optimum between surface enerC O M M U N IC A IO N

  • Inkjet Printing of luminescent cdte nanocrystal polymer composites
    Advanced Functional Materials, 2007
    Co-Authors: Emine Tekin, Patrick Smith, Stephanie Hoeppener, A M J Van Den Berg, Andrei S Susha, Andrey L Rogach, Jochen Feldmann, Ulrich S Schubert
    Abstract:

    Inkjet Printing is used to produce well-defined patterns of dots (with diameters of ca. 120 μm) that are composed of luminescent CdTe nanocrystals (NCs) embedded within a poly(vinylalcohol) (PVA) matrix. Addition of ethylene glycol (1–2 vol %) to the aqueous solution of CdTe NCs suppresses the well-known ring-formation effect in Inkjet Printing leading to exceptionally uniform dots. Atomic force microscopy characterization reveals that in the CdTe NC films the particle–particle interaction could be prevented using inert PVA as a matrix. Combinatorial libraries of CdTe NC–PVA composites with variable NC sizes and polymer/NC ratios are prepared using Inkjet Printing. These libraries are subsequently characterized using a UV/fluorescence plate reader to determine their luminescent properties. Energy transfer from green-light-emitting to red-light-emitting CdTe NCs in the composite containing green- (2.6 nm diameter) and red-emitting (3.5 nm diameter) NCs are demonstrated.

Yongsheng Chen - One of the best experts on this subject based on the ideXlab platform.

  • graphene based conducting inks for direct Inkjet Printing of flexible conductive patterns and their applications in electric circuits and chemical sensors
    Nano Research, 2011
    Co-Authors: Lu Huang, Xiangjian Wan, Jiajie Liang, Yi Huang, Yongsheng Chen
    Abstract:

    A series of Inkjet Printing processes have been studied using graphene-based inks. Under optimized conditions, using water-soluble single-layered graphene oxide (GO) and few-layered graphene oxide (FGO), various high image quality patterns could be printed on diverse flexible substrates, including paper, poly(ethylene terephthalate) (PET) and polyimide (PI), with a simple and low-cost Inkjet Printing technique. The graphene-based patterns printed on plastic substrates demonstrated a high electrical conductivity after thermal reduction, and more importantly, they retained the same conductivity over severe bending cycles. Accordingly, flexible electric circuits and a hydrogen peroxide chemical sensor were fabricated and showed excellent performances, demonstrating the applications of this simple and practical Inkjet Printing technique using graphene inks. The results show that graphene materials-which can be easily produced on a large scale and possess outstanding electronic properties-have great potential for the convenient fabrication of flexible and low-cost graphene-based electronic devices, by using a simple Inkjet Printing technique. Open image in new window

  • Graphene-based conducting inks for direct Inkjet Printing of flexible conductive patterns and their applications in electric circuits and chemical sensors
    Nano Research, 2011
    Co-Authors: Lu Huang, Xiangjian Wan, Jiajie Liang, Yi Huang, Yongsheng Chen
    Abstract:

    A series of Inkjet Printing processes have been studied using graphene-based inks. Under optimized conditions, using water-sol. single-layered graphene oxide (GO) and few-layered graphene oxide (FGO), various high image quality patterns could be printed on diverse flexible substrates, including paper, poly(ethylene terephthalate) (PET) and polyimide (PI), with a simple and low-cost Inkjet Printing technique. The graphene-based patterns printed on plastic substrates demonstrated a high elec. cond. after thermal redn., and more importantly, they retained the same cond. over severe bending cycles. Accordingly, flexible elec. circuits and a hydrogen peroxide chem. sensor were fabricated and showed excellent performances, demonstrating the applications of this simple and practical Inkjet Printing technique using graphene inks. The results show that graphene materials-which can be easily produced on a large scale and possess outstanding electronic properties-have great potential for the convenient fabrication of flexible and low-cost graphene-based electronic devices, by using a simple Inkjet Printing technique. on SciFinder(R)

Jyongsik Jang - One of the best experts on this subject based on the ideXlab platform.

  • flexible and transparent graphene films as acoustic actuator electrodes using Inkjet Printing
    Chemical Communications, 2011
    Co-Authors: Keunyoung Shin, Jinyong Hong, Jyongsik Jang
    Abstract:

    Flexible and transparent graphene films have been fabricated via Inkjet Printing and vapor deposition (VDP) methods, and the graphene-based acoustic actuator could be used as an extremely thin and lightweight loudspeaker.

  • micropatterning of graphene sheets by Inkjet Printing and its wideband dipole antenna application
    Advanced Materials, 2011
    Co-Authors: Keunyoung Shin, Jinyong Hong, Jyongsik Jang
    Abstract:

    PURPOSE: A graphene sheet using Inkjet Printing and a wideband dipole antenna application are provided to minimize the loss of raw material and time. CONSTITUTION: Waterborne graphene oxide nano particle solution is manufactured and is used for conductive ink of Inkjet Printing. The chemical characteristic of the waterborne graphene oxide nano particle solution is changed in order to form a detailed pattern on a supporting material. The waterborne graphene oxide nano particle solution is injected to a printer head, and an oxide graphene thin film is formed. The supporting material including the oxide graphene thin film is located in a vapor deposition reactor, and an oxidation-reduction reaction is executed. A graphene sheet based broadband dipole antenna electrode is connected to an antenna analysis device, and the performance of the antenna is measured.

  • micropatterning of conducting polymer tracks on plasma treated flexible substrate using vapor phase polymerization mediated Inkjet Printing
    Synthetic Metals, 2010
    Co-Authors: Joonhyuk Cho, Kyounghwan Shin, Jyongsik Jang
    Abstract:

    Abstract A facile strategy to pattern a conducting polymer on various flexible substrates is reported using vapor phase polymerization-mediated Inkjet Printing. Complex polypyrrole patterns were obtained via oxidation polymerization of vaporized monomer on the Inkjet-printed oxidant patterns. The patterned lines are readily controlled by Inkjet Printing with the high resolution of micrometer scale. FT-IR attenuated total reflection analysis and X-ray photoelectron spectroscopy were conducted in order to confirm the polymerization of pyrrole monomer. This process provided highly conductive polymer patterns of polypyrrole with the sheet resistance of 2.8 × 10 3  Ω/□, the minimum line width of ca . 60 μm and the film thickness of ca . 450 nm. Furthermore, metallic copper pattern was prepared on previously patterned polypyrrole architectures by electroless plating as a practical application.

Yanlin Song - One of the best experts on this subject based on the ideXlab platform.

  • Inkjet Printing bendable circuits based on an oil water interface reaction
    Applied Surface Science, 2018
    Co-Authors: H Li, Lihong Li, Min He, Dan Ding, Yuan Li, Yanlin Song
    Abstract:

    Abstract Bendable circuits were precisely fabricated by Inkjet Printing technology based on an oil-water interface reaction. Silver amine ion aqueous solution was used as Inkjet ink, and liquid polydimethylsiloxane (PDMS) added reducing agent was served as Printing substrate. Oil-water interface patterns were fabricated with Inkjet Printing technology. Then an oil-water interface reaction was carried out to generate silver circuit. It is demonstrated that the water phase could wet well the oil phase for generating a thick and compact silver layer by adding a small amount of surfactant. A mosaic silver layer with 15–20 μm thickness was obtained on the PDMS surface. The bendability of the Inkjet printed circuit was greatly improved with the mosaic structure. This work presents a facile way to fabricate bendable circuits by Inkjet Printing technology.

  • Inkjet Printing wearable electronic devices
    Journal of Materials Chemistry C, 2017
    Co-Authors: Meng Gao, Yanlin Song
    Abstract:

    In recent years, wearable electronics have experienced tremendous development due to their promising applications in fields such as portable, flexible/stretchable human-interactive sensors, displays, and energy devices. To effectively fabricate wearable electronics, a high-efficient, cost-saving, and eco-friendly manufacture technology is required. Inkjet Printing, which rapidly, precisely, and reproducibly deposits a broad variety of functional materials in a non-impact, addictive patterning, and maskless approach, serves as an effective tool for the fabrication of wearable electronics. In this review, the recent advances in inks, strategies, and the applications of Inkjet-printed wearable electronics are summarized. Based on uniform and high-resolution patterns, well-compatible functional inks can be deposited to fabricate flexible/stretchable and durable wearable electronics. Perspectives on the remaining challenges and future developments are also proposed.

  • fabrication of transparent multilayer circuits by Inkjet Printing
    Advanced Materials, 2016
    Co-Authors: Jieke Jiang, Bin Bao, Jiazhen Sun, Cong Zhang, Xi Yao, Yanlin Song
    Abstract:

    Conductive microcables embedded in a transparent film are fabricated by Inkjet Printing silver-nanoparticle ink into a liquid poly(dimethylsiloxane) (PDMS) precursor substrate. By controlling the spreading of the ink droplet and the rheological properties of the liquid substrate, transparent multilayer circuits composed of high-resolution embedded cables are achieved using a commercial Inkjet printer. This facile strategy provides a new avenue for Inkjet Printing of highly integrated and transparent electronics.

  • Inkjet Printing of ch3nh3pbi3 on a mesoscopic tio2 film for highly efficient perovskite solar cells
    Journal of Materials Chemistry, 2015
    Co-Authors: Kejian Jiang, Xueping Cui, Jinhua Huang, Qianqian Zhang, Xueqin Zhou, Lianmin Yang, Yanlin Song
    Abstract:

    An Inkjet Printing technique is successfully used to deposit a perovskite CH3NH3PbI3 layer on a mesoscopic TiO2 film. With combined optimization of the table temperature and the ink composition, a flat and uniform perovskite layer is realized on the TiO2 film, and the corresponding photovoltaic device exhibits a high efficiency of 12.3% with an average value of 11.2% under AM 1.5G conditions. The current work demonstrates that the Inkjet Printing method is environmentally benign and cost-effective with reduced waste of the toxic Pb-containing materials encountered inevitably in the existing techniques during the device preparation.

  • Inkjet Printing controllable footprint lines by regulating the dynamic wettability of coalescing ink droplets
    ACS Applied Materials & Interfaces, 2014
    Co-Authors: Meijin Liu, Jingxia Wang, Libin Wang, Lei Jiang, Yanlin Song
    Abstract:

    Inkjet Printing lines with controllable footprints is the prerequisite of fabricating high-quality patterns. However, achieving precise footprints of lines by Inkjet Printing is still a challenge because of the difficulty in controlling coalescences of ink droplets. Here, controllable footprint lines were fabricated by adjusting the ink droplets’ dynamic wettability which is depended on the ink droplets’ surface tension difference. The experimental surface tension difference of 0.77–1.50 mN/m leads to appropriate surface dynamic wettability to ink droplets and the formation of straight lines, which agrees well with the theoretical results. These results will pave the way for Printing electronics and patterns.

Lu Huang - One of the best experts on this subject based on the ideXlab platform.

  • graphene based conducting inks for direct Inkjet Printing of flexible conductive patterns and their applications in electric circuits and chemical sensors
    Nano Research, 2011
    Co-Authors: Lu Huang, Xiangjian Wan, Jiajie Liang, Yi Huang, Yongsheng Chen
    Abstract:

    A series of Inkjet Printing processes have been studied using graphene-based inks. Under optimized conditions, using water-soluble single-layered graphene oxide (GO) and few-layered graphene oxide (FGO), various high image quality patterns could be printed on diverse flexible substrates, including paper, poly(ethylene terephthalate) (PET) and polyimide (PI), with a simple and low-cost Inkjet Printing technique. The graphene-based patterns printed on plastic substrates demonstrated a high electrical conductivity after thermal reduction, and more importantly, they retained the same conductivity over severe bending cycles. Accordingly, flexible electric circuits and a hydrogen peroxide chemical sensor were fabricated and showed excellent performances, demonstrating the applications of this simple and practical Inkjet Printing technique using graphene inks. The results show that graphene materials-which can be easily produced on a large scale and possess outstanding electronic properties-have great potential for the convenient fabrication of flexible and low-cost graphene-based electronic devices, by using a simple Inkjet Printing technique. Open image in new window

  • Graphene-based conducting inks for direct Inkjet Printing of flexible conductive patterns and their applications in electric circuits and chemical sensors
    Nano Research, 2011
    Co-Authors: Lu Huang, Xiangjian Wan, Jiajie Liang, Yi Huang, Yongsheng Chen
    Abstract:

    A series of Inkjet Printing processes have been studied using graphene-based inks. Under optimized conditions, using water-sol. single-layered graphene oxide (GO) and few-layered graphene oxide (FGO), various high image quality patterns could be printed on diverse flexible substrates, including paper, poly(ethylene terephthalate) (PET) and polyimide (PI), with a simple and low-cost Inkjet Printing technique. The graphene-based patterns printed on plastic substrates demonstrated a high elec. cond. after thermal redn., and more importantly, they retained the same cond. over severe bending cycles. Accordingly, flexible elec. circuits and a hydrogen peroxide chem. sensor were fabricated and showed excellent performances, demonstrating the applications of this simple and practical Inkjet Printing technique using graphene inks. The results show that graphene materials-which can be easily produced on a large scale and possess outstanding electronic properties-have great potential for the convenient fabrication of flexible and low-cost graphene-based electronic devices, by using a simple Inkjet Printing technique. on SciFinder(R)