Researchers at Nihon University Target Biological Pigments (Metal-enhanced fluorescence platforms based on plasmonic ordered copper arrays: wavelength dependence of quenching and enhancement effects)
By a News Reporter-Staff News Editor at Life Science Weekly -- Researchers detail new data in Biological Factors. According to news originating from Tokyo, Japan, by NewsRx correspondents, research stated, "Ordered arrays of copper nanostructures were fabricated and modified with porphyrin molecules in order to evaluate fluorescence enhancement due to the localized surface plasmon resonance. The nanostructures were prepared by thermally depositing copper on the upper hemispheres of two-dimensional silica colloidal crystals."
Our news journalists obtained a quote from the research from Nihon University, "The wavelength at which the surface plasmon resonance of the nanostructures was generated was tuned to a longer wavelength than the interband transition region of copper (>590 nm) by controlling the diameter of the underlying silica particles. Immobilization of porphyrin monolayers onto the nanostructures was achieved via self-assembly of 16-mercaptohexadecanoic acid, which also suppressed the oxidation of the copper surface. The maximum fluorescence enhancement of porphyrin by a factor of 89.2 was achieved as compared with that on a planar Cu plate (CuP) due to the generation of the surface plasmon resonance. Furthermore, it was found that while the fluorescence from the porphyrin was quenched within the interband transition region, it was efficiently enhanced at longer wavelengths. It was demonstrated that the enhancement induced by the proximity of the fluorophore to the nanostructures was enough to overcome the highly efficient quenching effects of the metal."
According to the news editors, the research concluded: "From these results, it is speculated that the surface plasmon resonance of copper has tremendous potential for practical use as high functional plasmonic sensor and devices."
For more information on this research see: Metal-enhanced fluorescence platforms based on plasmonic ordered copper arrays: wavelength dependence of quenching and enhancement effects. Acs Nano, 2013;7(11):9997-10010. (American Chemical Society - www.acs.org; Acs Nano - www.pubs.acs.org/journal/ancac3)
The news correspondents report that additional information may be obtained from K. Sugawa, Dept. of Materials and Applied Chemistry, College of Science Technology, Nihon University , Chiyoda, Tokyo 101-8308, Japan. Additional authors for this research include T. Tamura, H. Tahara, D. Yamaguchi, T. Akiyama, J. Otsuki, Y. Kusaka, N. Fukuda and H. Ushijima (see also Biological Factors).
Keywords for this news article include: Tokyo, Japan, Asia, Biological Factors, Biological Pigments, Porphyrins.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC