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Laser-induced forward transfer of silver nanoparticle ink using burst technique
摘要： Laser-induced forward transfer (LIFT) is an effective approach to print materials in liquid state with high resolution. This procedure, however, suffers from bulging problem when printing continuous lines or patterns. In this study, LIFT of silver nanoparticle ink using burst technique was developed to mitigate this issue during printing continuous lines. Firstly, a set of droplet printing experiments were conducted to investigate the influences of the pulse energy and burst mode on the morphologies of the printed features. It was found that the resolution was enhanced and the phenomenon of splashing was improved with the introduction of burst technique at the same energy level. Thereafter, a group of lines were printed by changing the scanning speed in bursts of 1, 2 or 3 pulses. The results showed that the bulging of the printed line was effectively mitigated and the resolution was significantly improved in burst-3 mode.
关键词： Continuous lines,Laser-induced forward transfer,Burst technique,Silver nanoparticle ink,Printing
更新于2025-09-16 10:30:52
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The Analysis and Improvement of the Influence Factors for the Fabrication of SMT Template and Laser Cutting Technique
摘要： This paper briefly introduces the fabrication of SMT template and laser cutting technique, analyzes the factors that influence the SMT template fabrication and the laser cutting quality. Then it studies the improvement measures and methods through practical applications.
关键词： Laser Cutting,Cutting Technique Improvement,SMT,SMT Printing Template
更新于2025-09-16 10:30:52
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High‐precision alignment procedures for patterning processes in solar cell production
摘要： We present two approaches for high-accuracy aligning of patterning processes with each other when fabricating solar cells. We introduce the approaches on the example of two different patterning processes of which one is adjustable (laser process) and one is not adjustable (screen-printing process). The basic idea is to measure the coordinates of the applied structures of each involved patterning process at discrete grid points with respect to a reference coordinate system. We chose the grid points such that they completely define the final cell pattern. Then, we adjust the grid point coordinates of one of the patterning processes (the laser process) according to the pattern of the other process (the screen-printing process). The laser then performs the patterning by connecting the corrected grid points with each other in the desired direction. We perform the associated high-precision measurement of the patterns' coordinates by using either a high-precision offline coordinate measuring machine or a high-resolution inline camera system with subsequent computer-based data processing. The latter inline method enables high throughput and is, in turn, of great interest for mass production of solar cells. In this paper, we demonstrate the alignment procedure approaches on “pPassDop” solar cells by adjusting a locally applied laser process to the directly following screen-printing step. This proof of principle includes both above-mentioned methods for coordinate determination in separate cell batches. Our innovative alignment procedures so far demonstrated the successful matching of 40-μm-wide screen-printed contact fingers to 70-μm-wide laser-processed lines over the entire area of 6-inch solar cells.
关键词： PERL,coordinate correction,silicon solar cells,patterning processes,selective emitter,PERC,bifacial,alignment,screen printing,pPassDop,laser
更新于2025-09-16 10:30:52
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Light-controlled efficient photoluminescence based on an europium β-diketonate complex with single-crystal-to-single-crystal [2+2] cycloaddition
摘要： A brand new europium(III) b-diketonate complex undergoes a single-crystal-to-single-crystal transformation via [2+2] cycloaddition after UV irradiation, triggering strong Eu(III) red emission turn-on, which is highly photostable even after 50 hours of irradiation. A photo-patterning process is successfully conducted for security printing application in materials science.
关键词： lanthanide complexes,single-crystal-to-single-crystal transformation,security printing,UV irradiation,photoluminescent
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON BIOSCIENCES AND MEDICAL ENGINEERING (ICBME2019): Towards innovative research and cross-disciplinary collaborations - Bali, Indonesia (11–12 April 2019)] PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON BIOSCIENCES AND MEDICAL ENGINEERING (ICBME2019): Towards innovative research and cross-disciplinary collaborations - Laser-induced breakdown spectroscopy (LIBS) for printing ink analysis coupled with principle component analysis (PCA)
摘要： Laser-induced breakdown spectroscopy (LIBS) has been applied to perform elemental analysis of printing ink samples. Samples of black printing inks from three types of printers viz. inkjet, laser-jet, and photocopier (three different brands for each type) and one control sample (blank white A4 paper) were analysed under optimised conditions. Results revealed that the LIBS method when coupled with PCA was able to provide discriminative evidence on elemental differences among all the different printing inks. Considering its time and cost effectiveness as well as requiring only minute amount of sample with no sample pre-treatment steps, the combination of LIBS and PCA may prove useful for forensic questioned document practical caseworks.
关键词： forensic questioned document,Laser-induced breakdown spectroscopy,principle component analysis,PCA,printing ink analysis,LIBS
更新于2025-09-16 10:30:52
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Study on direct laser metal deposition
摘要： In the current economic situation with worldwide trend for developing new products, the importance of time and cost reduction increases day-by-day. To achieve this goal the man-machine-material interaction should be maximized. Direct laser metal deposition (DLMD) is one of the most famous approaches for this. DLMD is one kind of 3D printing technology (Additive Manufacturing) together with laser cladding process. In DLMD, it is possible to fabricate fully functional metallic parts directly from CAD data, which involves a feeding of metal powders through a nozzle into a high power laser beam and creates a melt pool on the surface of the solid substrate upon which a metallic powder is injected. DLMD process are now acknowledged worldwide and is also known to all by several other names such as Laser engineered net shaping (LENS), Direct light fabrication (DLF), Laser deposition welding (LDW) and powder fusion welding (PFW). The role of nozzle in this process is as important as the heart of a human being. There are variety of nozzle configurations namely off-axis, continuous coaxial and discontinuous coaxial powder injection. Comparison of these types of configurations towards specific applications revels very interesting observations which are subsequently reproduced in this article. In DLMD, powder metals are fed through the nozzle onto a metallic substrate. Then, powder melts by the laser heat and creates a metal pool on the solid substrate by fusion bonding. Once the deposition of a layer, the laser head, along with the powder delivery nozzle, move up. The whole process is carried out until final near-net-shape of the metal part or component is achieved with a variety of material applicability and high quality clad track deposition with good mechanical properties. After development of this process in 1995, lot of researchers for several years work on various aspects of high quality deposition with dimensional accuracy such as good clad geometry, clad height, and microstructure study of the mechanical properties. Through this paper on the basis of literature survey an attempt has been made to focus on proper selection of the set up configuration for direct laser metal deposition to fulfill the requirement and helps to achieve high quality deposition.
关键词： 3D printing,Laser cladding,Additive manufacturing
更新于2025-09-16 10:30:52
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Fabrication of indium tin oxide free bulk heterojunction organic solar cells using inkjet-printed silver grids and PEDOT: PSS
摘要： In this article, we discuss the inkjet printing of silver nanoparticle ink and PEDOT: PSS (poly (3,4-ethylene dioxythiophene) polystyrene sulfonate) for indium tin oxide-free organic solar cells. We observed that the significant parameters for the printing of silver nanoparticle ink and PEDOT: PSS are waveform parameters voltage and time, substrate temperature, drop spacing and annealing temperature. Organic solar cells were fabricated over grids with three different line spacing (1mm, 2mm and 3mm) and better performance was observed for grids with 2 mm spacing. The figure of limit, which is the ratio between the optical transmission and sheet resistance, was used as a tool to evaluate the performance of the current collecting grid. The figure of limit was high for grids with 2 mm spacing (21.11 × 10?3??1), which confirmed the experimental results.
关键词： Inkjet printing,ITO free organic solar cells,PEDOT: PSS,silver grid
更新于2025-09-16 10:30:52
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Screen printed tin selenide films used as the counter electrodes in dye sensitized solar cells
摘要： In this work, the scalable screen printing process has been adopted to prepare low-cost and earth-abundant tin selenide (SnSe) films to study as the counter electrode in dye-sensitized solar cells (DSSCs). The SnSe powder was synthesized by solid state reaction method and corresponding films were fabricated by screen printing technique. The electrocatalytic activity of SnSe for redox iodide/triiodide (I?/I3?) couple and charge transfer resistance at the CE/electrolyte interface were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The DSSC with SnSe counter electrode exhibited with power conversion efficiency (PCE) of ~5.76% with open-circuit voltage of 0.63 V and short circuit current density of 12.39 mA/cm2 whereas the DSSC with platinum counter electrode showed PCE of 8.09% with open-circuit voltage of 0.68 V and short circuit current density of 14.77 mA/cm2. Thus, earth abundant and low cost SnSe films fabricated by screen printing technique could be an alternative to costly platinum counter electrode in DSSC.
关键词： Counter electrode,SnSe films,DSSC,Chalcogenides,Screen printing
更新于2025-09-16 10:30:52
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3D printing of mixed matrix films based on metal-organic frameworks and thermoplastic polyamide 12 by selective laser sintering for water applications
摘要： The fabrication of metal-organic framework (MOF)-based macro-materials is considered as a promising strategy towards the practical applications of powdered MOF crystals. In this study, selective laser sintering (SLS), an advanced three-dimensional (3D) powder printing technique, has been employed to fabricate MOF-polymer mixed matrix films (MMFs) using thermoplastic polyamide 12 (PA12) powder as the matrix material and five types of MOFs including ZIF-67, NH2-MIL-101(Al), MOF-801, HKUST-1 and ZIF-8 crystals as the fillers. A three-layer HKUST-1-PA12 complex with a grid pattern is fabricated to demonstrate the printability of 3D MOF-polymer structure. Single-layer MMFs with grid patterns are printed using the five types of MOF fillers with different mass loadings to study their free-standing characteristic, thickness, specific surface area, hydrophilia, water permeate flux and mechanical stability. The methylene blue (MB) adsorption tests are conducted using the NH2-MIL-101(Al)-PA12 MMFs with different grid patterns to exemplify the applications of the MMFs for water purification. It is confirmed that the MOF components retain their high maximum adsorption capacity and the printed MMFs can be conveniently regenerated for cyclic utilization. This work provides an insight into the utilization of advanced 3D printing technology to manufacture macro MOF-polymer materials for practical applications.
关键词： water purification,metal-organic framework,3D printing,selective laser sintering,mixed matrix film
更新于2025-09-16 10:30:52
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[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - Optimizing the Conductivity of Ink-Jet Printed Microwave Components on Polymer Substrates by Laser Sintering
摘要： In this work, microwave components were printed on a Kapton (polyimide) substrate using a Drop-On-Demand (DOD) ink jet printer with silver nanoparticle ink. Two different laser curing strategies are presented by implementing selective sintering. The measured improvement of the achieved conductivity is between 70 and 100% for such resonators from 5 to 15 GHz.
关键词： Kapton (PI),Electrical conductivity,Polymer substrates,laser sintering,Microwave components,Inkjet printing
更新于2025-09-16 10:30:52