No abstract

Double-doped magnetic particles that incorporated magnetites into both the surface and inside the silica cores were fabricated via the sol-gel reaction of citrate-stabilized magnetites with silicon alkoxide. Double-doped magnetic particles were easily fabricated and exhibited an higher magnetism in comparison to the singledoped magnetic particles that were prepared by the erosion of surface-deposited magneties from double-doped magentic particles. Thin gold layer was formed over magnetic silica nanospheres via nanoseed-mediated growth of gold clusters. The plasmon-derived absorption bands of double-doped magnetic silica-gold nanoshells were more broadened and shifted down by ca. 20 nm as compared to those of single-doped magnetic silicagold nanoshells, which were attributed to not only the surface scattering of incident light due to relatively rough surafce morphology, but also heterogeneous permittivity of dielectric cores due to surface-deposited magnetites.

Adhesion of flexible copper clad laminates (FCCL) on two different types of polyimide (PI), sputtering raw polyimide (SRPI) and casting raw polyimide (CRPI), were studied. Chromium (Cr), strongly reacts with dangling O bonds, was used as tie-coating layer in order to improve low adhesion between copper (Cu) and polyimide (PI). Polyimide surfaces were pretreated with gas plasma that was generated with a mixture of argon and oxygen before sputtering process. Adhesion measurement was performed on these samples according to IPC specification. The results show that the peel strength of the FCCL on SRPI was higher than on CRPI. This is considered to be due to the formation of Cu-Cr-O solid solution at the metal- PI interface.

No abstract