Modification of polyimide wetting properties by laser ablated conical microstructures

Least, Brandon; Willis, David A.

doi:10.1016/j.apsusc.2012.12.141

Cited by 32 publications

(13 citation statements)

References 32 publications

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“…The structural and chemical changes in femtosecond laser ablated polyimide also resulted in significantly altered wetting properties. The static contact angle of untreated polyimide was found to be 79 ± 1 • which is consistent with the value reported in the literature [15]. After laser ablation, the contact angle changed significantly, and was found to be 97 ± 2 • perpendicular to the laser-induced tracks and 132 ± 1 • parallel to the tracks.…”

Section: Resultssupporting

confidence: 89%

“…The wetting properties of polyimide depend on the micro and nanostructures generated during laser ablation, and conical nanostructures have been investigated in detail [14]. Furthermore, it was shown that conical microstructures caused by 349 nm Nd:YLF laser altered the wetting properties [15], which could be linked to an increase in carbon to oxygen ratio caused by a wetting transition from a wetting (Â < 90 • ) to a non-wetting (Â > 90 • ) surface.…”

Section: Introductionmentioning

confidence: 98%

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Changes in wetting and contact charge transfer by femtosecond laser-ablation of polyimide

Guo

Dai

Gong

2015

Applied Surface Science

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 98%

Changes in wetting and contact charge transfer by femtosecond laser-ablation of polyimide

Guo

Dai

Gong

2015

Applied Surface Science

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“…In this study, we investigate the formation and growth of ellipsoidal cones ( Figure 1a and 2) using a series of chemical, crystallographic, and topographical analyses. While several authors [11,19,20,[35][36][37][38][39][40] have already observed the formation of ellipsoidal cones via laser processing, this work focuses on elucidating the mechanisms behind the formation and growth of ellipsoidal cones by multiple laser raster scans.…”

Section: Model Computationsmentioning

confidence: 99%

“…Numerous studies on Kapton® HN polyimide films have shown that, when subject to laser radiation, conical features are produced on the substrate surface [36][37][38][39][40].…”

Section: Chemical Analysismentioning

confidence: 99%

Investigating and understanding the effects of multiple femtosecond laser scans on the surface topography of stainless steel 304 and titanium

Ling

Saïd

Brodusch

et al. 2015

Applied Surface Science

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The majority of studies performed on the formation of surface features by femtosecond laser radiation focuses on single scan procedures, i.e. solely manipulating the laser beam once over the target area to fabricate different surface topographies. In this work, the effect of scanning stainless steel 304 multiple times with femtosecond laser pulses is thoroughly investigated over a wide range of fluences. The resultant laserinduced surface topographies can be categorized into two different regimes. In the low fluence regime (F Σline,max < 130 J/cm 2 ), ellipsoidal cones (randomly distributed surface protrusions covered by several layers of nanoparticles) are formed. Based on chemical, crystallographic, and topographical analyses, we conclude that these ellipsoidal cones are composed of unablated steel whose conical geometry offers a significant degree of fluence reduction (35-52%). Therefore, the rest of the irradiated area is preferentially ablated at a higher rate than the ellipsoidal cones. The second, or high fluence regime (F Σline,max > 130 J/cm 2 ) consists of laser-induced surface patterns such as columnar and chaotic structures. Here, the surface topography showed little to no change even when the target was scanned repeatedly. This is in stark contrast to the ellipsoidal cones in the first regime, which evolve and grow continuously as more laser passes are applied. Keywords

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“…Also due to the exceptional mechanical, chemical and thermal stability of Kapton films, traditional surface modification methods use harsh conditions to tune their inherent hydrophobicity by oxidizing and/or removing part of their surface polyimide. These traditional methods include laser ablation123, ion-beam etching45, plasma etching67, UV/ozone treatment68, acid69 and/or base10111213 treatments etc . The harsh conditions these methods use not only produce environmentally hazardous and health-threatening by-products or wastes (such as corrosive strong bases and acids, carcinogenic benzene, extremely irritating acrolein and other volatile hydrocarbons) which can be a serious environmental and safety problem when such surface modification is done in large scales and/or conducted indoors, but also compromise the structural integrity and the properties of the Kapton substrates.…”

mentioning

confidence: 99%

A bio-enabled maximally mild layer-by-layer Kapton surface modification approach for the fabrication of all-inkjet-printed flexible electronic devices

Fang

Hester

et al. 2016

Sci Rep

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A bio-enabled, environmentally-friendly, and maximally mild layer-by-layer approach has been developed to surface modify inherently hydrophobic Kapton HN substrates to allow for great printability of both water- and organic solvent-based inks thus facilitating the full-inkjet-printing of flexible electronic devices. Different from the traditional Kapton surface modification approaches which are structure-compromising and use harsh conditions to target, and oxidize and/or remove part of, the surface polyimide of Kapton, the present Kapton surface modification approach targeted the surface electric charges borne by its additive particles, and was not only the first to utilize environmentally-friendly clinical biomolecules to build up a thin film of protamine-heparin complex on Kapton, but also the first to be conducted under minimally destructive and maximally mild conditions. Besides, for electrically charged ink particles, the present surface modification method can enhance the uniformity of the inkjet-printed films by reducing the “coffee ring effect”. As a proof-of-concept demonstration, reduced graphene oxide-based gas sensors, which were flexible, ultra-lightweight, and miniature-sized, were fully-inkjet-printed on surface modified Kapton HN films and tested for their sensitivity to dimethyl methylphosphonate (a nerve agent simulant). Such fabricated sensors survived a Scotch-tape peel test and were found insensitive to repeated bending to a small 0.5 cm radius.

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Modification of polyimide wetting properties by laser ablated conical microstructures

Cited by 32 publications

References 32 publications

Changes in wetting and contact charge transfer by femtosecond laser-ablation of polyimide

Changes in wetting and contact charge transfer by femtosecond laser-ablation of polyimide

Investigating and understanding the effects of multiple femtosecond laser scans on the surface topography of stainless steel 304 and titanium

A bio-enabled maximally mild layer-by-layer Kapton surface modification approach for the fabrication of all-inkjet-printed flexible electronic devices

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