Laser Direct Activation of Polyimide for Selective Electroless Plating of Flexible Conductive Patterns

Ren, Jun; Li, Dongya; Zhang, Yang; Yang, Wenzhen; Nie, Heng‐Yong; Liu, Yu

doi:10.1021/acsaelm.1c01193

Cited by 9 publications

(4 citation statements)

References 53 publications

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“…Figure 1d shows the comparison of the processing time between previously reported laser fabrications [26,[65][66][67][68] and this work for the synthesis of porous graphene with dimensions of 10 × 10, 100 × 100, and 200 × 200 mm 2 . The difference in production time was negligible in the small area of 10 × 10 mm 2 , while a significant decrease of more than 66.5 times was confirmed in large areas of 100 × 100 and 200 × 200 mm 2 .…”

Section: Fpg Fabrication Mechanism By Synergistic Photo-effectsmentioning

confidence: 88%

Flash-Induced High-Throughput Porous Graphene via Synergistic Photo-Effects for Electromagnetic Interference Shielding

et al. 2023

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Porous 2D materials with high conductivity and large surface area have been proposed for potential electromagnetic interference (EMI) shielding materials in future mobility and wearable applications to prevent signal noise, transmission inaccuracy, system malfunction, and health hazards. Here, we report on the synthesis of lightweight and flexible flash-induced porous graphene (FPG) with excellent EMI shielding performance. The broad spectrum of pulsed flashlight induces photo-chemical and photo-thermal reactions in polyimide films, forming 5 × 10 cm2-size porous graphene with a hollow pillar structure in a few milliseconds. The resulting material demonstrated low density (0.0354 g cm−3) and outstanding absolute EMI shielding effectiveness of 1.12 × 105 dB cm2 g−1. The FPG was characterized via thorough material analyses, and its mechanical durability and flexibility were confirmed by a bending cycle test. Finally, the FPG was utilized in drone and wearable applications, showing effective EMI shielding performance for internal/external EMI in a drone radar system and reducing the specific absorption rate in the human body.

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Section: Fpg Fabrication Mechanism By Synergistic Photo-effectsmentioning

confidence: 88%

Flash-Induced High-Throughput Porous Graphene via Synergistic Photo-Effects for Electromagnetic Interference Shielding

et al. 2023

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“…Third, Anderetta et al reported that the PAA solution showed feasibility for epoxy resin, but there was the most peeled metal observation along the grid lines among these studies [19]. Lastly, Ren et al have suggested the KNaC 4 H 4 O 6 solution for electroless plating on PI due to its verified excellent adhesive strength of 5B [20].…”

Section: Adhesion Strength Between Pekk-ni Coatingmentioning

confidence: 99%

Enhanced Metal Coating Adhesion by Surface Modification of 3D Printed PEKKs

et al. 2022

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PEKK (polyether-ketone-ketone) polymer has been actively studied in applying electronic devices in satellites owing to its excellent light weight and thermal resistance. However, the limitation of metal coating to form on the PEKK surface is due to the high-volume resistivity and surface resistance. Here, we have investigated the correlations between the chemical treatment of the surface and adhesion strength between polymer–metal coating. Three-dimensional printed PEKK objects were manufactured and nickel was deposited on the surface by electroless plating. As the concentration of H2SO4 increased from 12.5 to 14.3 mol/L, the pore diameter showed a tendency to increase. However, as growing pore induced connecting each other, the pore size re-decreased from 15.1 to 18.0 mol/L. To control pore size and uniformity, we investigated the pore diameter of 3D printed PEKK as a function of treatment time and temperature. Uniform pores were observed at a temperature of 50 °C which were formed after 10 min and the average pore size was 0.28. After H2SO4 swelling, samples were re-treated in the KMnO4-H3PO4 etching system for the hydrophilic group. KMnO4 broken C=C bonding and generated hydrophilic groups such as -COOH and -OH, the contact angle decreased from 64.7 to 51.1° compared with H2SO4 swelling. XPS survey spectra confirmed that not only breaking C=C bonding but also increasing hydrophilicity due to -OH, -C-, -SO3 and the catalyst absorption of Pd was improved. As a result of adhesive strength by ASTM D3359, compared with the H2SO4 swelling, the KMnO4-H3PO4 etching system showed 5B which is the best result in standard test methods by adhesive tape test and peeling amount on the tape was less than 0.01%.

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“…Researchers have proposed various novel methods to fabricate flexible circuits while reducing pollution and cost, including metal nano wires [29] and nanoparticle ink printing, [30,31] laser ablation, [32] and laser-seeded deposition. [33][34][35] We utilize the laser scribing method on the commercially available copperpolyimide film to achieve a cost-efficient and environmentfriendly fabrication for rapid and adaptive patterning of flexible devices.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Cash Sterilization with Ultrafast and Flexible Joule‐Heating Strategy by Laser Patterning

Xu,

Lin,

Chen

et al. 2024

Adv Materials Inter

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Since ancient times, humans have learned to use fire and other heating methods to fight against dangerous pathogens, like cooking raw food, sterilizing surgical tools, and disinfecting other pathogen transmission media. However, it remains difficult for current heating methods to achieve extremely fast and highly efficient sterilization simultaneously. Herein, an ultrafast and uniform heating‐based strategy with outstanding bactericidal performance is proposed. Ultra‐precise laser manufacturing is used to fabricate the Joule heater which can be rapidly heated to 90 °C in 5 s with less than 1 °C fluctuation in a large area by real‐time temperature feedback control. An over 98% bactericidal efficiency on S. aureus for 30 s and on E. coli for merely 5 s is shown. The heating strategy shows a 360 times faster acceleration compared to the commonly used steam sterilization from the suggested guidelines by the Centers for Disease Control and Prevention (CDC), indicating that high temperatures with short duration can effectively disinfect microorganisms. As a proof of concept, this heating strategy can be widely applied to sterilizing cash and various objects to help protect the public from bacteria in daily life.

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Laser Direct Activation of Polyimide for Selective Electroless Plating of Flexible Conductive Patterns

Cited by 9 publications

References 53 publications

Flash-Induced High-Throughput Porous Graphene via Synergistic Photo-Effects for Electromagnetic Interference Shielding

Flash-Induced High-Throughput Porous Graphene via Synergistic Photo-Effects for Electromagnetic Interference Shielding

Enhanced Metal Coating Adhesion by Surface Modification of 3D Printed PEKKs

Highly Efficient Cash Sterilization with Ultrafast and Flexible Joule‐Heating Strategy by Laser Patterning

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