- 标题
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- 实验方案
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Inkjet Printing of SiO2 Hollow Spheres/Polyimide Hybrid Films for Foldable Low-k ILD
摘要： We demonstrate inkjet printing as a viable method for flexible interlayer dielectrics (ILDs) films with a low dielectric constant, excellent mechanical characteristics, and thermal properties in foldable organic light emitting diodes (OLEDs). SiO2 hollow spheres (SHSs)/polyimide (PI) hybrid films were printed by SiO2 coated polystyrene (PS) ink and PI ink. The relative permittivity of the hybrid films decreased from 3.45 to 1.87. The thermally stable PI fims maintained their weight below 500 °C from the TGA result. The dielectric constant and current density retained their properties after 50,000 cycles of bending at a 1 mm bend radius. We propose that the inkjet printing of SHSs/PI hybrid films described herein is a promising approach for flexible ILDs in foldable OLEDs.
关键词： SiO2 hollow sphere,polyimide,foldable OLEDs,low-k material,inkjet printing,interlayer dielectric
更新于2025-09-10 09:29:36
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Optimization of dispersant-free colloidal ink droplets for inkjet patterning without the coffee-ring effect using 1-octanethiol-coated copper nano-ink with a Standard Clean-1-treated substrate
摘要： Inkjet-printed patterns and droplets were formed by the inkjet printing method on a Standard Clean-1 (SC-1)-treated substrate using anti-oxidized copper nano-ink. The hydrophobicity of the substrate increased after the SC-1 treatment. Copper nanoparticles were coated with 1-octanethiol vapors via a dry coating method to produce anti-oxidized nanoparticles, which were dispersed in a solvent to form a nano-ink. Droplets of the 1-octanethiol-coated copper nano-ink at 50 wt% concentration had a uniform morphology when printed on the SC-1-treated glass substrate. The minimum printed pattern line width was 55 μm on the SC-1-treated glass and had a resistivity of 1.73 × 10–7 ?·m. This resistivity was 4.3-times lower than that of the untreated substrate. Moreover, the pattern printed using the nano-ink made with 1-octanethiol-coated copper nanoparticles showed good adhesion and provided approximately 2.1-times lower resistivity. The dispersion of the nanoparticles within the droplet was more hydrophobic and formed uniform inkjet-printed patterns that had lower resistivity compared with those made with the uncoated nanoparticle-containing ink.
关键词： SC-1 treatment,Coffee-ring effect,1-Octanethiol-coated copper nano-ink,Inkjet printing,Resistivity
更新于2025-09-10 09:29:36
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Novel luminescent PLA/MgAl2O4:Sm3+ composite filaments for 3D printing application
摘要： In this work, luminescent bioplastic composite ?laments for 3D printing were fabricated from polylactic acid (PLA) and samarium doped magnesium aluminate phosphor (MgAl2O4:Sm3+). The phosphor was prepared by a metal-complex decomposition method. The obtained powder was then modi?ed by 3-aminopropyl triethoxysilane to improve compatibility with PLA matrix. Untreated and treated phosphors exhibited characteristic photoluminescent (PL) peaks of Sm3+ ion. Composite ?laments of PLA with different amounts of phosphors (0, 1, 2, 3 and 4 phr) were produced by an extrusion process. Differential scanning calorimetry (DSC) scans have revealed that the phosphor ?llers lowered glass-transition (Tg), crystallization (Tc), and melting (Tm) temperatures of the PLA. PL measurements have shown luminescent properties of 3D printed samples resembling those of phosphor powders. Luminescent intensity was increased with the increasing ratio of phosphors. The phosphors not only developed luminescence but also strengthened mechanical properties of the composites. Furthermore, surface modi?cation was able to improve the mechanical properties of the composite ?laments as evident in a series of mechanical tests.
关键词： Polymer composite,3D printing,Samarium doped magnesium aluminate,Polylactic acid,Phosphor
更新于2025-09-10 09:29:36
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Alginate-graphene oxide hydrogels with enhanced ionic tunability and chemomechanical stability for light-directed 3D printing
摘要： Nanocomposite hydrogels that incorporate 2D carbon nanomaterials could enable augmented and responsive behaviors not observed with polymeric matrices alone. In particular, non-covalent interactions could facilitate enhanced mechanical performance that can be self-recovered with external stimuli. Here, we demonstrate alginate-graphene oxide (GO) hydrogels using a non-covalent, ionic crosslinking mechanism compatible with light-directed 3D printing. We show that alginate-GO hydrogels exhibit improved mechanical performance in shear, compression, and tension, including a two-fold increase in shear modulus, a three-fold decrease in inelastic deformation, and a nine-fold increase in fracture energy relative to alginate-only hydrogels. Moreover, alginate-GO hydrogels are stabilized by hydrogen bonding between nanosheets and remain intact after removal of ionic crosslinkers by chelation. As a consequence, the shear modulus of these nanocomposite hydrogels can be tuned by over 500-fold via external ion concentration. We demonstrate that alginate-GO can be stereolithographically printed into robust, freestanding and overhanging 3D structures. These designer material architectures exhibit outstanding stability and superoleophobicity in high salt solution, which can be used to repel and manipulate a variety of oils. Overall, such nanocomposite hydrogels with engineered non-covalent interactions could enable “smart” multiresponsive and multifunctional devices for aqueous and marine environments.
关键词： Superoleophobicity,Ionic crosslinking,Chemomechanical stability,Graphene oxide,3D printing,Alginate,Nanocomposite hydrogels,Mechanical performance
更新于2025-09-10 09:29:36
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EHMP-DLP: multi-projector DLP with energy homogenization for large-size 3D printing
摘要： Purpose – In some three-dimensional (3D) printing application scenarios, e.g., model manufacture, it is necessary to print large-sized objects. However, it is impossible to implement large-size 3D printing using a single projector in digital light processing (DLP)-based mask projection 3D printing because of the limitations of the digital micromirror device chips. Design/methodology/approach – A multi-projector DLP with energy homogenization (EHMP-DLP) scheme is proposed for large-size 3D printing. First, a large-area printing plane is established by tiling multiple projectors. Second, the projector set’s tiling pattern is obtained automatically, and the maximum printable plane is determined. Third, the energy is homogenized across the entire printable plane by adjusting gray levels of the images input into the projectors. Finally, slices are automatically segmented based on the tiling pattern of the projector set, and the gray levels of these slices are reassigned based on the images of the corresponding projectors. Findings – Large-area high-intensity projection for mask projection 3D printing can be performed by tiling multiple DLP projectors. The tiled projector output energies can be homogenized by adjusting the images of the projectors. Uniform ultraviolet energy is important for high-quality printing. Practical implications – A prototype device is constructed using two projectors. The printable area becomes 140 (cid:1) 210 mm from the original 140 (cid:1) 110 mm. Originality/value – The proposed EHMP-DLP scheme enables 3D printing of large-size objects with linearly increasing printing times and high printing precision. A device was established using two projectors to practice the scheme and can easily be extended to larger sizes by using more projectors.
关键词： Ultraviolet energy,Multi-projector DLP with energy homogenization,Large-size 3D printing,Mask projection,EHMP-DLP,Digital modulation
更新于2025-09-10 09:29:36
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A 400-GHz Wideband High-Gain Quartz-Based Single-Layered Folded Reflectarray Antenna for Terahertz Applications
摘要： Compact high-gain antennas are highly desired in the high speed terahertz (THz) wireless system, especially for the space limited application such as the high speed inter-link inside the high density wireless communication base station. To this end, a 400-GHz folded reflectarray (FRA) antenna with high gain, high aperture efficiency and compact profile is proposed in this paper. It is composed of a feed source, a single-layered reflectarray using a lithography process on quartz, and a wire-grid polarizer implemented by the printed-circuit-board (PCB) technology. A 3-D printed fixture is used to assemble all parts together. In order to design accurately the THz electromagnetic properties of the supporting dielectric materials are extracted by using a THz time-domain spectrometer system. Then, a single-layered phasing element, made up of a pair of orthogonally I-shaped structures with an open square ring, is proposed and designed based on the extracted material characteristics. Both phase compensation and polarization conversion can be realized by the proposed unit cell. A reflectarray is designed by using the proposed phasing element with the conventional array synthesizing theory, and a THz grid polarizer is designed with strips on a 0.127 mm Taconic TLY-5 substrate. The THz grid is placed in front of the THz feed and the reflectarray, which is fully reflective to the feed and transparent to the reflectarray. All components of the FRA antenna have been fabricated and assembled. Experiments show that the FRA prototype has a peak gain of 33.66 dBi at 400 GHz with an aperture efficiency of 33.65%, and a 3-dB gain bandwidth of 16% (357-421 GHz).
关键词： terahertz,3-D printing,high-gain,material characteristics,quartz substrate,single-layer,Folded reflectarray antenna,THz time-domain spectrometer
更新于2025-09-10 09:29:36
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Wavelength-optimized Two-Photon Polymerization Using Initiators Based on Multipolar Aminostyryl-1,3,5-triazines
摘要： Two-photon induced polymerization (2PP) based 3D printing is a powerful microfabrication tool. Specialized two-photon initiators (2PIs) are critical components of the employed photosensitive polymerizable formulations. This work investigates the cooperative enhancement of two-photon absorption cross sections (σ2PA) in a series of 1,3,5-triazine-derivatives bearing 1-3 aminostyryl-donor arms, creating dipolar, quadrupolar and octupolar push-pull systems. The multipolar 2PIs were successfully prepared and characterized, σ2PA were determined using z-scan at 800 nm as well as spectrally resolved two-photon excited fluorescence measurements, and the results were compared to high-level ab initio computations. Modern tunable femtosecond lasers allow 2PP-processing at optimum wavelengths tailored to the absorption behavior of the 2PI. 2PP structuring tests revealed that while performance at 800 nm is similar, at their respective σ2PA-maxima the octupolar triazine-derivative outperforms a well-established ketone-based quadrupolar reference 2PI, with significantly lower fabrication threshold at exceedingly high writing speeds up to 200 mm/s and a broader window for ideal processing parameters.
关键词： two-photon initiators,femtosecond lasers,3D printing,two-photon induced polymerization,1,3,5-triazine-derivatives
更新于2025-09-10 09:29:36
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Surface grafting modification of titanium dioxide by silane coupler KH570 and its influences on the application of blue light curing ink
摘要： A series of reactive TiO2 pigments with olefinic double-bonds were prepared by grafting modification of silane coupler KH570 to be covalently anchored in the blue-light curing film, which improved the color fastness to crocking of the printed fabrics significantly. Effects of KH570 concentrations on particle size, surface wettability and dispersing stability of KH570-TiO2 pigments, photo-polymerization of KH570-TiO2 bule-light curing inks and tensile properties of curing films were investigated. Color fastness to crocking of KH570-TiO2 pigment on cotton fabric was explored. Results showed that compared to the native TiO2, all the properties of KH570-TiO2 improved. With the increases of KH570 concentrations, the grafting degrees of KH570-TiO2 had gradual increase. The surface hydrophobicity and dispersion stability of KH570-TiO2 pigments, photo-polymerization of KH570-TiO2 blue-light curing ink and tensile properties of curing films enhanced, especially those of 12KH570-TiO2~20KH570-TiO2 the best. Within the concentrations of KH570 12～20 wt %, the printed fabrics had dry/wet color fastness to crocking no less than 4 grades.
关键词： printing ink,grafting,blue-light curing,Titanium dioxide,silane coupler
更新于2025-09-09 09:28:46
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Synthesis and Electrochemical Characterization of AgNP Ink Suitable for Inkjet Printing
摘要： To meet the growing demand for inkjet printable nanoparticle-based conductive inks, novel synthetic approaches are needed. In this study, spherical silver nanoparticles (AgNPs) with a mean diameter of approximately 2.5 nm were synthesized by the reduction of silver nitrate using an aqueous hydrazine solution in the presence of poly(acrylic acid) as a capping agent. The main goal of this work was the implementation of cyclic voltammetry as an electrochemical method for studying both the absorption of poly(acrylic acid) on the grain surface and nanoparticle interactions. The same technique was used to determine equimolar additions of hydrazine to obtain a high yield of reduced silver. All solutions used in the experiments were prepared at a high molar concentration. Silver nanoparticle-based ink was prepared by dispersing dried nanoparticles into a mixture of water and ethylene glycol and was stable for over seven months. For a comprehensive study of the prepared nanoink, UV-visible and electronic microscopy measurements were carried out. An inkjet technology was applied to deposit conductive ink to form linear silver tracks on a flexible substrate. These tracks exhibited a resistivity of 8.0×10-8 ?m.
关键词： conductive ink,poly(acrylic acid),cyclic voltammetry,Inkjet printing,silver nanoparticles
更新于2025-09-09 09:28:46
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[IEEE 2018 13th International Congress Molded Interconnect Devices (MID) - Würzburg, Germany (2018.9.25-2018.9.26)] 2018 13th International Congress Molded Interconnect Devices (MID) - Low-Temperature Sintering of Nanometal Inks on Polymer Substrates
摘要： Digital non-contact-printing technologies such as inkjet or Aerosol Jet are becoming more and more interesting for the manufacturing of electronic components due to their benefits such as easy variation of printing layouts, short process chains without masks, large variety of usable substrates and inks - frequently based on nano metals - and a certain 3D capability. In this contribution options are discussed to sinter nano metal inks such as Ag, Au, and CuNi inks at low temperature, thus enabling the use of temperature sensitive polymer substrates like PC, PS, or PMMA. This includes the addition of chemical agents as well as light-based sintering methods such as photonic curing or laser sintering. Finally some application examples are presented.
关键词： Digital printing,laser sintering,photonic curing,low-temperature sintering,nano metal inks
更新于2025-09-09 09:28:46