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Arrays of microdots of gold nanoparticles immobilized above gold surface probed by optical second-harmonic microscopy

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2 Author(s)
Tsuboi, Kazuma ; PRESTO, Japan Science and Technology Agency (JST), 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan ; Kajikawa, Kotaro

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Gold nanoparticle arrays are fabricated on a planar gold surface obtained from UV-photopatterned self-assembled monolayer (SAM) films. The arrays are composed of microdots in which spherical gold nanoparticles are immobilized above a gold surface with a gap distance of a few nanometers supported by SAM films used as a spacer. Two kinds of preparation methods were examined: (1) to pattern a spacer SAM film that makes cross-linkage between the gold surface and the gold nanoparticles, and (2) to form ordered microholes in a SAM film, followed by deposition of the spacer SAM film that makes the cross-linkage in the microholes. Both methods provide us with the ordered microdots of gold nanoparticles on a gold surface. The formation of the microdot arrays were probed by optical second-harmonic microscopy.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 10 )