Abstract
We have examined the plasmonic sensing ability of Au nanoparticle (NP) arrays for dilute cyclohexane. Au NP arrays were fabricated on SiO2 by a sputter deposition technique. The change in an extinction spectrum of Au NP arrays before and after exposure of cyclohexane vapor enabled us to detect it. The Au NP array prepared with 4.4×1016Auatoms/cm2 by heating at 300°C was densely arranged on the substrate and exhibited a high sensitivity for cyclohexane. The experimentally detectable concentration of cyclohexane was as low as 0.5vol%, much lower than its explosion limit (1.3vol%). Furthermore, the detection limit was estimated to be ~0.3vol%, which was approximately one fourth of the explosion limit.
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