24 February 2016 Measurement of molecular length of self-assembled monolayer probed by localized surface plasmon resonance
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Abstract
We propose a method to measure the variation of the molecular length of self-assembled monolayers (SAMs) when it is exposed to solutions at different pH conditions. The surface immobilized gold nanospheres (SIGNs) shows strong absorption peak at the wavelengths of 600-800 nm when p-polarized light is illuminated. The peak wavelength depends on the length of the gap distance between the SIGNs and the substrate. The gap is supported by the SAM molecules. According to the analytical calculation based on multiple expansion, the relation between the peak wavelength of the SIGN structures and the gap distance is calculated, to evaluate the molecular length of the SAM through the optical absorption spectroscopy for the SIGN structures. The molecular length of the SIGN structure was measured in air, water, acidic, and basic solutions. It was found that the molecular lengths are longer in acidic solutions.
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Juri Ito, Kotaro Kajikawa, "Measurement of molecular length of self-assembled monolayer probed by localized surface plasmon resonance", Proc. SPIE 9745, Organic Photonic Materials and Devices XVIII, 97450T (24 February 2016); doi: 10.1117/12.2212226; https://doi.org/10.1117/12.2212226
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