Abstract
We investigated the optical response of a huge number of silver nanoparticles (AgNPs) densely assembled on an organic microsphere, i.e., AgNP-fixed bead, under the collective phenomena of localized surface plasmons. For this purpose, various optical properties of such a AgNP-fixed bead were analyzed in aqueous solution by dark-field optical microscopy and laser Raman microscopy. In particular, in comparison with the optical spectrum of single AgNPs, significant spectral broadening and redshift were observed due to plasmonic superradiance with decreasing interparticle distance to the subnanoscale when using small binder molecules in the AgNP-fixed bead. Furthermore, we observed surface-enhanced Raman scattering and clarified the sensitivity of the signal intensity to the size of the binder molecules between the AgNPs, which can be explained based on optical response theory using a discrete integral with spherical cells. These results and discussion provide a guiding principle for broadband plasmonic light absorbers and for highly sensitive detection of small molecules and nanoscale biomaterials based on vast numbers of nanogaps produced by a bottom-up self-assembly process.
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Acknowledgments
The authors would like to thank Prof. H. Shiigi, Prof. T. Nagaoka, and Prof. H. Ishihara for their useful advice and kind support. A major part of this work was supported by the Special Coordination Funds for Promoting Science and Technology from MEXT [Improvement of Research Environment for Young Researchers (FY 2008-2012)], Grants-in-Aid for Exploratory Research No. 23655072 from JSPS, Grants-in-Aid for Young Researcher (A) No. 24685013, as well as a Grant-in-Aid for Scientific Research (B) No. 23310079 from JSPS.
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Tokonami, S., Nishida, K., Nishimura, Y. et al. Enhanced collective optical response of vast numbers of silver nanoparticles assembled on a microbead. Res Chem Intermed 40, 2337–2346 (2014). https://doi.org/10.1007/s11164-014-1610-0
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DOI: https://doi.org/10.1007/s11164-014-1610-0