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Continuous-Wave Laser-Induced Transfer of Metal Nanoparticles to Arbitrary Polymer Substrates
摘要： Laser-induced forward transfer (LIFT) and selective laser sintering (SLS) are two distinct laser processes that can be applied to metal nanoparticle (NP) ink for the fabrication of a conductive layer on various substrates. A pulsed laser and a continuous-wave (CW) laser are utilized respectively in the conventional LIFT and SLS processes; however, in this study, CW laser-induced transfer of the metal NP is proposed to achieve simultaneous sintering and transfer of the metal NP to a wide range of polymer substrates. At the optimum laser parameters, it was shown that a high-quality uniform metal conductor was created on the acceptor substrate while the metal NP was sharply detached from the donor substrate, and we anticipate that such an asymmetric transfer phenomenon is related to the di?erence in the adhesion strengths. The resultant metal electrode exhibits a low resistivity that is comparable to its bulk counterpart, together with strong adhesion to the target polymer substrate. The versatility of the proposed process in terms of the target substrate and applicable metal NPs brightens its prospects as a facile manufacturing scheme for ?exible electronics.
关键词： selective laser sintering,flexible electronics,metal nanoparticle ink,laser-induced forward transfer
更新于2025-09-23 15:21:01
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A Low‐Cost Laser‐Based Nano‐3D Polymer Printer for Rapid Surface Patterning and Chemical Synthesis of Peptide and Glycan Microarrays
摘要： A low-cost laser-based printing setup is presented, which allows for the spot-wise patterning of surfaces with defined polymer nanolayers. These nanolayer spots serve as a “solid solvent,” embedding different chemicals, chemical building blocks, materials, or precursors and can be stacked on top of each other. By melting the spot pattern, the polymer-embedded molecules are released for chemical reaction. This enables researchers to quickly pattern a surface with different molecules and materials, mixing them directly on the surface for high-throughput chemical synthesis to generate and screen diverse microarray libraries. In contrast to expensive ink-jet or contact printing, this approach does not require premixing of inks, which enables in situ combinatorial mixing. Easy access and versatility of this patterning approach are shown by generating microarrays of various biomolecules, such as glycans for the first time, to screen interactions of antibodies and lectins. In addition, a layer-by-layer solid-phase synthesis of peptides directly on the microarray is presented. Amino acid–containing nanolayers are repeatedly laser-transferred and reacted with the functionalized acceptor surface in defined patterns. This simple system enables a reproducible array production, down to spot-to-spot distances of 100 μm, and offers a flexible and cheap alternative to expensive spotting robot technology.
关键词： microarray,open source,laser-induced forward transfer,combinatorial synthesis,solid phase synthesis
更新于2025-09-19 17:13:59
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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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Thermo-mechanical analysis of blister formation on a rigid substrate in blister-actuated laser-induced forward transfer
摘要： The paper presents an analytic model of glass-interface-polyimide structure for predicting the blister formation during blister-actuated laser-induced forward transfer. In order to investigate the dynamic process of the heating and vaporizing of polymer in laser/matter interaction and crack propagation of glass/polymer interface in blister expansion, a discrete quasi-static analysis method is proposed. In the frame of fracture mechanics, the energy release rate is calculated and introduced to analyze interfacial crack propagation of glass/polymer interface. In additional, the blister expansion and formation are also computed based on a finite element model, and the analytical predictions are shown to be in good agreement with simulated results. The results show that blister height and crack length are sensitive to laser fluence. A higher laser fluence is much easier to induce higher blister height. The crack will propagate as the laser fluence is larger than the critical laser fluence.
关键词： polymer,blister formation,virtual crack closure technique,blister-actuated laser-induced forward transfer,crack propagation
更新于2025-09-16 10:30:52
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[IEEE 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Sao Paulo, Brazil (2019.10.7-2019.10.9)] 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Laser induced forward transfer of silver nanoparticles patterns
摘要： Laser-induced forward transfer (LIFT) with fs-pulses is used to produce silver nanoparticles patterns on glass substrates. LIFT is a versatile direct laser write technique in which a variety of materials can be transferred from a donor substrate to a receiver one. Here we present a study on the optimal parameters, such as scan speed and pulse energy, required to obtain a micrometric pattern on the transfer process. Spectroscopy analyses confirmed the composition and the formation of silver nanoparticles. Also, the electron localized microscopy deposition of silver nanoparticles, indicating such approach as a promising technique for the development of applications from electronics to photonics.
关键词： Femtosecond laser induced forward transfer,Micromachining,Silver nanoparticles
更新于2025-09-16 10:30:52
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Laser direct printing of solder paste
摘要： We experimentally demonstrated a laser-based approach for the maskless printing of solder paste with a predefined size and position. In this work, a 532 nm laser marking system is used to induce the formation of a solder paste bridge between the donor and acceptor substrate. After the donor is removed vertically, the bridge will rupture and a high aspect ratio voxel can be obtained on the acceptor substrate. The width and height of transferred voxels can be controlled by modifying the laser fluence. In order to find out the specific conditions for the solder paste bridge formation, we carried out transfer experiments at different gap distances and found out a bridge formation threshold. Solder paste bridges can be produced only when the gap distance is smaller than the threshold. Furthermore, the threshold can be affected by the film thickness and spot size. In this condition, a solder paste array with an average size of 100 μm and a pitch of 200 μm has been successfully transferred. Compared to conventional printing methods, the method proposed in this paper can effectively improve the transfer accuracy and reduce the production cost.
关键词： laser direct printing,laser-induced forward transfer,solder paste,high aspect ratio voxel,maskless printing
更新于2025-09-12 10:27:22
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Pico- to nanosecond pulsed laser-induced forward transfer (LIFT) of silver nanoparticle inks: a comparative study
摘要： Silver nanoparticle inks are among the key functional materials used in printed electronics. Depositing it by laser-induced forward transfer remains a challenging task because the non-linear rheological nature of these inks narrows the range of the laser processing parameters. Understanding, therefore, the influence of the laser parameters on the ejection dynamics and deposition quality is of critical importance. The influence of the laser pulse duration from pico- to nanosecond-laser-induced jet dynamics was investigated using time-resolved shadowgraphy imaging. Jet speed and surface area analyses showed that in the lower laser fluence level range, picosecond pulses induce higher surface area ejections which propagate at higher velocities. As the laser fluence levels were increased, the difference in jet velocity and surface area evolutions narrows. Deposition analysis showed a similar behavior with lower transfer thresholds and larger depositions at lower fluence range when picosecond-laser pulses were used.
关键词： Time-resolved shadowgraphy,Silver nanoparticle inks,Nanosecond pulses,Laser-induced forward transfer,Printed electronics,Picosecond pulses
更新于2025-09-12 10:27:22
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Performance characterization of continuous-wave laser-induced forward transfer of liquid bioink
摘要： Herein, we propose a continuous-wave laser-induced forward transfer (CW-LIFT) system that possesses high printing quality with a high printing success rate. CW-LIFT can automatically deposit droplets equally and uniformly as a customized pattern. In this study, we selected an 830 nm near-infrared CW laser and applied a 20× microscope objective lens to highly focus the laser beam. In addition, a 16 nm gold thin film was used as the energy-absorbing layer for CW-LIFT. We demonstrated that the CW-LIFT can print liquid bioink and deposit cells in a controlled and precise way.
关键词： bioink,continuous-wave laser-induced forward transfer,laser printing,CW-LIFT,cell deposition
更新于2025-09-11 14:15:04