Photo-induced evolution of copper sheets from cluster molecules and its application to photolithographic copper patterning
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UV photoexcitation of (t-butylethynyl copper)24 cluster films induces segregation of the crystals into metallic and organic phases and leads to evolve the metallic sheets sandwiched by organic polymers. The growth of the metallic crystals in the plane of the photo-electromagnetic field is attributed due to plasmon-plasmon interaction among nanoparticles embedded in dielectric polymer matrices. The surface enhanced photochemical reaction of residual cluster molecules on the photon incident direction is expected to take an important role for joining the metal particles to produce a metallic sheet. We can apply this phenomenon for photolithographic copper pattern generation on a flexible base plate.
PACS.68.37.-d Microscopy of surfaces, interfaces, and thin films 68.37.Lp Transmission electron microscopy (TEM) (including STEM, HRTEM, etc.) 68.55.-a Thin film structure and morphology 78.20.-e Optical properties of bulk materials and thin films 78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures 81.16.Rf Nanoscale pattern formation
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