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Formation of Copper Based Nanoparticles Embedded in a Relatively Thick Polyimide Film by Thermal Curing in Reducing Atmosphere

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We investigated the formation of nanoparticles in a relatively thick polyimide (PI) film (>1 m) in controlled atmospheres and optical properties of these nanoparticles. Polyamic acid of 10 wt% BPDA-PDA was spin-coated on the 25 nm Cu thin film and thermally cured at 350 °C in high purity nitrogen or 5% H2 + 95% N2 atmosphere. The fabricated nanoparticles in high purity nitrogen atmosphere had spherical shape and were dispersed in the 1.5 m thick PI film. Its phase was revealed as Cu and Cuprous Oxide by X-ray diffraction (XRD). Its size and optical absorption depended on deposited metal thin film thickness. After post heat-treatment in 5% H2 + 95% N2 atmosphere, surface plasmon resonance from metallic Cu nanoparticle was enhanced. In the specimens cured in reducing atmosphere, 5% H2 + 95% N2, highly dense and 3.5 nm size nanoparticles were well dispersed in an entire PI film. XRD results and optical data revealed that nanoparticles fabricated in 5% H2 + 95% N2 atmosphere were metallic Cu. Thermal curing in reducing atmosphere produces nanoparticles of high density, and uniform dispersion in a relatively thick PI film.


Document Type: Research Article


Publication date: 2008-10-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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