Reductive Nucleation of Palladium Nanoparticles on a Cycloolefin Polymer Surface Oxidized with Active Oxygen Species Generated by Vacuum Ultraviolet Excitation

Sugimura, Hiroyuki; Miki, Naoki; Nakamura, Akihiro; Ichii, Takashi

doi:10.1246/cl.140594

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…All these VUV photochemically generated active oxygen species (VUV-O) are highly oxidative to organics. Photochemical processing by using VUV-O has been demonstrated to be a powerful method for modifying and patterning organic surfaces, such as polymers − and self-assembled monolayers (SAMs). − The precursor to rGO, i.e., GO, can be regarded as a kind of organic materials and it is promising to utilize locally generated VUV-O for the photoetching of GO.…”

Section: Introductionmentioning

confidence: 99%

Vacuum-Ultraviolet Promoted Oxidative Micro Photoetching of Graphene Oxide

Utsunomiya

Ichii

et al. 2016

ACS Appl. Mater. Interfaces

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Microprocessing of graphene oxide (GO) films is of fundamental importance in fabricating graphene-based devices. We demonstrate the photoetching of GO sheets using vacuum-ultraviolet (VUV, λ = 172 nm) light under controlled atmospheric pressure. X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and differential interference contrast microscopy (DIC) studies revealed that the photoetching of GO films successfully proceeded in the regions exposed to VUV irradiation in the oxygen-containing atmosphere. Precise photoetching of the GO sheets was achieved at a vacuum pressure of 5 × 10(3) Pa with VUV light irradiation for 20 min. This was followed by VUV irradiation in a high vacuum (<10(-3) Pa) and sonication in water. The photoetched GO sheets then transformed into reduced GO (rGO) patterns. The minimum feature fabricated by this method was 2 μm wide lines aligned at an interval of 4 μm. This method provides a cost-effective way to fabricate rGO patterns with fewer boundaries between rGO sheets and offers a better integrity of rGO, which can be promising for further applications in micro mechanics, micro electrochemistry, optoelectronics, etc.

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Section: Introductionmentioning

confidence: 99%

Vacuum-Ultraviolet Promoted Oxidative Micro Photoetching of Graphene Oxide

Utsunomiya

Ichii

et al. 2016

ACS Appl. Mater. Interfaces

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“…Accordingly, seed layer formation methods have been developed, namely, the wet process using electroless plating and the dry process using sputtering. In the wet process, the COP surface is modified using UV irradiation [10][11][12][13] or vacuum UV (VUV) irradiation [14][15][16] before seed layer formation via electroless plating because the molecular structure of a COP does not have polar functional groups. 17) UV/VUV irradiation induces cleavage of molecular bonds on the COP surface.…”

Section: Introductionmentioning

confidence: 99%

Comparison of vacuum ultraviolet irradiation and oxygen plasma treatment as pretreatment for copper seed layer on cycloolefin polymer

Shimizu,

Fukada,

Endo

et al. 2024

Jpn. J. Appl. Phys.

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This study explores the factors governing the peel strength characteristics between a cycloolefin polymer (COP) film and a copper plating layer with a copper seed layer, for applying to antenna circuits in 6G communications. The peel strength depended on the surface modification methods as pretreatment for copper seed layer formation: vacuum ultraviolet (VUV) irradiation and oxygen plasma treatment. VUV irradiation induced a modified layer with brittleness on the COP surface, leading to substrate failure. Conversely, oxygen plasma treatment formed a quite thin modified layer and facilitated Cu2O formation by bonding functional groups on the topmost COP surface with copper in the seed layer at the interface between the COP film and the copper plating layer, resulting in interface failure rather than substrate failure. Therefore, enhancing peel strength involves preventing the formation of a modified layer on the surface and generating a significant quantity of functional groups on the topmost surface.

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“…For example, plasma treatment and ultraviolet (UV) light irradiation are suitable for modifying surfaces because they can raise the surface energy and increase adhesion. [1][2][3][4][5][6][7][8][9][10][11][12] The surface modication by plasma treatment and UV irradiation proceeds via the chemical reactions of the polymers themselves, resulting in the formation of functional groups that govern surface properties. Functional groups can also be introduced by forming thin layers on polymer surfaces.…”

Section: Introductionmentioning

confidence: 99%