| AVS 54th International Symposium | |
| Plasmonics Topical Conference | Monday Sessions |
| Session PL-MoM |
| Session: | Plasmonic Nanostructures and Plasmon Manipulation |
| Presenter: | M.L. Curri, National Research Council CNR IPCF Italy |
| Authors: | M.L. Curri, National Research Council CNR IPCF Italy T. Placido, National Research Council CNR IPCF Italy R. Comparelli, National Research Council CNR IPCF Italy M. Striccoli, National Research Council CNR IPCF Italy D. Cozzoli, National Nanotechnology Laboratory Lecce Italy A. Agostiano, National Research Council CNR IPCF Italy G. Capitani, Università di Bari, Italy F. Giannici, Università di Palermo, Italy |
| Correspondent: | Click to Email |
Au nanoparticles are of great interest due to their unusual physical and chemical properties with respect to their bulk equivalent. The field has recently experienced significant growth because of advances in the reproducible synthesis of Au nonspherical nanoparticles with tunable plasmon resonances, and applications of plasmon-resonant nanoparticles in nanophotonics, chemical sensing, and biomedical engineering.1 Current research has been focused on one-dimensional nanoparticles such as nanorods (NRs) since the morphological anisotropy results in very complex physical properties.2 Water soluble Au nanospheres and nanorods have been synthesized by using various methods such as templating,3 photochemistry,4 seeding5 and electrochemistry.6 In this work, we propose a Ag ion mediated photochemical synthesis of gold nanoparticles (NPs) in micellar template under UV irradiation. We performed a systematic study on the role of Ag+ ions in directing the growth of Au NRs, in order to elucidate the mechanism that produces anisotropic particles rather than spheres. The samples have been characterized by UV-Vis-NIR absorption spectroscopy, High Resolution Transmission Electron Microscopy (HR-TEM), Energy Dispersive Spectrometry (EDS), Inductively Coupled Plasma (ICP), and Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS) measurements. Moreover the size and shape distribution has also been investigated by statistical analysis of the experimental data. The overall obtained results allowed us to finely tune the size and the shape distribution of gold NPs and to propose a reasonable mechanism describing the role played by silver ions in directing the growth of gold NRs.7,8
1Daniel, M.C.; Astruc, D.; Chem. Rev. 2004,104, 293.
2Kim, F.; Kwan, S.; Akana, J.; Yang, P. J. Am. Soc. 2001, 123, 4360.
3Bohmer, M. R.; Fokkink, L. G. J.; Schonenberger, C.; van der Zande, B. M. I. J. Phys. Chem. B 1997, 101, 852.
4Esumi, K.; Matsuhisa, K.; Torigoe, K. Langmuir 1995, 11, 3285.
5 Murphy C. J.; Jana N. R. Adv. Mater. 2002, 14, 80.
6Yu, Y. Y.; Chang, S. S.; Lee, C. L.; Wang, C. R. C. J. Phys. Chem. B 1997, 101, 6661-6664. Acknowledgment.
7This work was financially supported by the EC-funded project NaPa (Contract no. NMP4-CT-2003-500120) ) and by MIUR SINERGY programme (FIRB RBNE03S7XZ).