Dual Regime Spray Deposition Based Laser Direct Writing of Metal Patterns on Polymer Substrates

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Semih Akin ◽  
Ted Gabor ◽  
Seunghwan Jo ◽  
Hangeun Joe ◽  
Jung-Ting Tsai ◽  
...  
Keyword(s):  
Spray Deposition ◽  
Polymer Surface ◽  
Surface Preparation ◽  
Dip Coating ◽  
Polymer Materials ◽  
Activation Process ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Polymer Substrates ◽  
Metallization Of Polymers

Abstract In recent years, the metallization of polymers has been intensely studied as it takes advantage of both plastics and metals. Laser direct writing (LDW) is one of the most widely used technologies to obtain metal patterns on polymer substrates. In LDW technology, different methods including injection-molding, drop-casting, dip coating, and spin coating are utilized for surface preparation of polymer materials prior to the laser activation process. In this study, an atomization based dual regime spray coating system is introduced as a novel method to prepare the surface of the materials for LDW of metal patterns. Copper micropatterns on the polymer surface were achieved with a minimum feature size of 30 μm, having a strong adhesion and excellent conductivity. The results show that the dual regime spray deposition system can be potentially used to obtain uniform thin film coating with relatively less material consumption on the substrates for surface preparation of laser direct metallization of polymers.

Laser direct writing of nanocompounds

2011 ◽  
Vol 1365 ◽  
Author(s):  
Andreas Ostendorf ◽  
M’Barek Chakif ◽  
Qingchuan Guo
Keyword(s):  
Polymer Materials ◽  
Polymerization Process ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Bioactive Materials ◽  
New Approach ◽  
Photosensitive Polymer ◽  
The Matrix ◽  
Inorganic Nanomaterials ◽  
Huge Variety

ABSTRACTLaser direct polymerization has been proven as a powerful tool to generate microstructures. Often photosensitive polymer materials are used because they can be tuned by photoactive molecules to be susceptible to a specific wavelength of light to initiate the polymerization process. One of the main drawbacks of this technique is the lack of functional polymers, e.g. conductive, magnetic, mechanical, optical or bioactive materials. Nanocomposites (nanocompounds), i.e. polymers with inorganic nanomaterials incorporated in the matrix offer a huge variety of new functionalities. A new approach will be presented how functional nanocomposite polymers can be generated and used for laser direct writing techniques. This can open the door for completely new MEMS and MOEMS devices comprising active and passive subcomponents.

Effect of Polymer Substrates on Nano Scale Hot Embossing

2003 ◽  
Vol 782 ◽  
Author(s):  
Jin-Hyung Lee ◽  
Hyun-Woo Lim ◽  
Jin-Goo Park ◽  
Eun-Kyu Lee ◽  
Yangsun Kim
Keyword(s):  
Surface Energy ◽  
Surface Properties ◽  
Process Development ◽  
Adhesion Force ◽  
Polymer Surface ◽  
Hot Embossing ◽  
Surface Characteristic ◽  
Direct Writing ◽  
Polymer Substrates ◽  
Nano Size

ABSTRACTHot embossing has been widely accepted as an alternative to photolithography in generating patterns on polymer substrates. The optimization of embossing process should be accomplished based on polymer surface properties. Therefore, in this paper, polymers with different surface characteristic were selected and the surface properties of each polymers such as surface energy and adhesion force were investigated by contact angle and AFM. Based on these results, the imprinted nano patterns were compared. Silicon molds with nano size patterns were fabricated by e-beam direct writing. Molds were coated with self-assembled monolayer (SAM) of (1, 1, 2, 2H –perfluorooctyl)-trichlorosilane to reduce the stiction between molds and polymer substrates. For embossing, pressure of 500 psi, embossing time of 5 min and temperature of above transition temperature were applied. Mr-I 8010 polymer (Micro Resist Technology), Polymethylmethacrylate (PMMA 495k) and LOR (polyaliphatic imide copolymer) were used as substrate for hot embossing process development in nano size. These polymers were spun coated on the Si wafer with the thickness of 150 nm. The nano size patterns obtained by hot embossing were identified by atomic force microscopy without breaking the pattern and compared based on the polymer surface properties. The mr-I 8010 which has the lowest surface energy and adhesion force shows the best demolding property.

scholarly journals Collagen/Chitosan Functionalization of Complex 3D Structures Fabricated by Laser Direct Writing via Two-Photon Polymerization for Enhanced Osteogenesis

2020 ◽  
Vol 21 (17) ◽  
pp. 6426
Author(s):  
Irina Alexandra Păun ◽  
Cosmin Cătălin Mustăciosu ◽  
Roxana Cristina Popescu ◽  
Bogdan Ştefăniţă Călin ◽  
Mona Mihăilescu
Keyword(s):  
Bone Substitutes ◽  
Staining Intensity ◽  
Dip Coating ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Alizarin Red ◽  
Biological Assays ◽  
3D Structures ◽  
Two Photon ◽  
Osteogenic Effect

The fabrication of 3D microstructures is under continuous development for engineering bone substitutes. Collagen/chitosan (Col/CT) blends emerge as biomaterials that meet the mechanical and biological requirements associated with bone tissue. In this work, we optimize the osteogenic effect of 3D microstructures by their functionalization with Col/CT blends with different blending ratios. The structures were fabricated by laser direct writing via two-photons polymerization of IP-L780 photopolymer. They comprised of hexagonal and ellipsoidal units 80 µm in length, 40 µm in width and 14 µm height, separated by 20 µm pillars. Structures’ functionalization was achieved via dip coating in Col/CT blends with specific blending ratios. The osteogenic role of Col/CT functionalization of the 3D structures was confirmed by biological assays concerning the expression of alkaline phosphatase (ALP) and osteocalcin secretion as osteogenic markers and Alizarin Red (AR) as dye for mineral deposits in osteoblast-like cells seeded on the structures. The structures having ellipsoidal units showed the best results, but the trends were similar for both ellipsoidal and hexagonal units. The strongest osteogenic effect was obtained for Col/CT blending ratio of 20/80, as demonstrated by the highest ALP activity, osteocalcin secretion and AR staining intensity in the seeded cells compared to all the other samples.

Fabrication of Biodegradable Polymeric Micro-Analytical Devices Using a Laser Direct Writing Method

2010 ◽  
Vol 136 ◽  
pp. 53-58
Author(s):  
W.W. Zhang ◽  
J.J. Zhu ◽  
Winco K.C. Yung ◽  
Simon S. Ang
Keyword(s):  
Laser Ablation ◽  
Biodegradable Polymer ◽  
Photoelectron Spectroscopy ◽  
Polymer Surface ◽  
Microfluidic Channel ◽  
Dimensional Accuracy ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Force Microscopy ◽  
Atomic Force

Microfluidic channel and micro-cavities were fabricated from polyhydroxyalkanoate biodegradable polymer using a direct 20ns, 248 nm excimer laser writing method. First we give a design of the micro-analytical device; second we discussed the laser ablation of biodegradable ppolymer material. The morphology, dimensional accuracy, and surface conditions of the fabricated micro-devices were studied using atomic force microscopy, scanning electron microscopy, optical microscopy, and X-ray photoelectron spectroscopy. Melting of the biodegradable polymer was observed at a fluency of 50mJ/cm2 while ablation was observed at a fluency of 100mJ/cm2.The different width between bottom and top surface are studied in our research. The particle deposited on the polymer surface is seen from the SEM of 248nm laser ablation of PHA. However, the direct burning of PHA can be seen from the optical photo by 355nm laser. Compare to results of PHA with two different lasers, we can see that the 248nm laser is a suitable choice.

Wavelength tunable fiber Bragg gratings fabricated by stress annealing assisted femtosecond laser direct writing

2021 ◽  
Vol 61 ◽  
pp. 102427
Author(s):  
Xiaoyan Sun ◽  
Zikun Chang ◽  
Li Zeng ◽  
Xinran Dong ◽  
Youwang Hu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Wavelength Tunable

Micropatterned Cell‐Repellent Interface Using Femtosecond Laser Direct Writing to Engineer Controlled Cell Organization

2021 ◽  
pp. 2100178
Author(s):  
Wenguang Yang ◽  
Honghui Chu ◽  
Shuxiang Cai ◽  
Wenfeng Liang ◽  
Haibo Yu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Cell Organization
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