CHEMICAL SYNTHESIS OF SMALL ALUMINIUM NANOPARTICLES
XXV International Materials Research Congress, Cancun, Mexique, 14-19 august 2016
Metallic nanoparticles are widely recognized as local sources of energy that resolve the above issues thanks to their optical properties based to the plasmon resonance. To achieve UV plasmonics, aluminum appears as the best candidate . This metal has a negative dielectric constant combined with a low loss coefficient at UV wavelengths down to 100 nm, matching all the criteria to obtain high energy Localized Surface Plasmon Resonances (LSPR) . UV Localized Surface Plasmon Resonances (LSPRs) are very attracting because their energy matches with most of the electronic transition energies of molecules or solids. In this scope, the development of efficient and low-cost techniques for the synthesis of reproducible Al nanostructures with very good crystalline quality and optical properties has to be investigated [3,4]. In this presentation, we describe various methods for the growth of crystalline Al-NPs. The nanoparticles are made using very reproducible synthesis routes. The first approach is based on the reduction of aluminum ions. The second approach relies on the use of sono-chemistry of aluminum foils. Particles as small as 2nm have been synthesized and characterized with a transmission electron microscope, extinction spectroscopy and other methods. By playing on various the medium of synthesis and the temperature of reaction, it appears to be possible to tune under control the size of the nanoparticles. We completed the characterizations by investigating the optical properties of the synthesized Al NPs. To summarize, we described in this presentation various chemical method for the growth of aluminum nanoparticle. AL-NPs present a very good homogeneity and reproducibility. They exhibit sharp localized surface plasmon resonances (LSPRs) in the UV region as it has been showed by extinction spectroscopy characterization. The authors acknowledge the Région Champagne-Ardennes, the Conseil général de lAube, and the FEDER funds through their support of the regional platform Nanomat. JP thanks the ANR projects NATO for the financial support. Keywords: Aluminium, nanoparticles, UV plasmonics References: 1. Gerard and S.K. Gray, Journal of Physics D: Applied Physics 48, 184001 (2015). 2. Martin, M. Kociak, Z. Mahfoud, J. Proust, D. Gerard, and J. Plain, Nano Letters 14, 5517-5523 (2014). 3. Martin, J. Proust, D. Gerard, and J. Plain, Optical Materials Express 3, 954 (2013). 4. J. Martin and J. Plain, Journal of Physics D: Applied Physics 48, 184002 (2015).