Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2938861
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We investigated the spectral feature and fluorescence lifetime of quasimonolayered porphyrins at very short distance to metal substrates (1-2.5 nm) through fine-tuning the length of alkanethiols. The ordered self-assembled monolayers of alkanethiols on Au(111) act as a uniform electronic decoupling layer and suppress the interface quenching via charge transfer. However, the fluorescence quenching via nonradiative energy transfer to the metal still prevails in the porphyrin-alkanethiol-metal sandwich structures. The decay rates are found to follow a 1/d(3) dependency on spacer thickness, which suggests that the classical electromagnetic theory appears still valid at distance down to 1 nm through volume damping. (C) 2008 American Institute of Physics.
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