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Jpn. J. Appl. Phys. 46 (2007) pp. L1222-L1224  |Next Article|  |Table of Contents|
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Express Letter

Precisely Controlled Fabrication of a Highly Sensitive Au Sensor Film for Surface Enhanced Spectroscopy

Dominik Enders1,2, Tadaaki Nagao1,2, Tomonobu Nakayama1,2, and Masakazu Aono1,2

1Nano System Functionality Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
2Nanoscale Quantum Conductor Array Project, ICORP, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

(Received September 20, 2007; accepted November 30, 2007; published online December 14, 2007)

We propose a new method of infrared (IR) monitored two-step wet-chemical preparation of plasmonic Au nanostructures with a high degree of surface enhanced infrared absorption (SEIRA) activity. Au nanoparticles (AuNP) are deposited on SiO2/Si substrate and grown to form a network of densely packed islands very close to the two-dimensional percolation threshold. Monitoring the growth process with IR spectroscopy enables the termination of growth at a well defined state of the film morphology and is a great advantage compared to the previous methods. An octadecanethiol (ODT) monolayer adsorbed on the SEIRA optimized film gives a huge absorption intensity of 16.5% for the antisymmetric CH2 stretching vibration.

URL: http://jjap.jsap.jp/link?JJAP/46/L1222/
DOI: 10.1143/JJAP.46.L1222
KEYWORDS:FTIR, SEIRA, in situ characterization, octadecanethiol, nanoparticles, gold, silicon, hydroxylamine


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