Gold nanoparticles on nanodiamond for nanophotonic applications
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Gold nanoparticles on nanodiamond for nanophotonic applications S. Orlanducci1, I. Cianchetta1, E. Tamburri1, M.L. Terranova1, M. C. Cassani2, R. Matassa3, M. Rossi3 1
Dip.to Scienze e Tecnologie Chimiche – MinimaLab, Università degli Studi di Roma “Tor Vergata”, Via Della Ricerca Scientifica, 00133 Roma, Italy 2 Dipartimento di Chimica Fisica e Inorganica, Viale Risorgimento 4, INSTM UdR Bologna, 40136 Bologna, Italy 3 Dip.to di Scienze di Base e Applicate per l’Ingegneria (BASE) – Centro di Ricerca per le Nanotecnologie Applicate all'Ingegneria (CNIS), Università degli Studi di Roma “Sapienza”, Via A. Scarpa, 00161 Roma, Italy
ABSTRACT We present here some recent results of a research focused on the preparation of detonation nanodiamond/Au nanoparticles hybrid materials. Two different experimental routes are followed for the decoration of diamond nanoparticles by Au nanoparticles, that are in turn prepared by an innovative electroless approach. Structure and morphology at the nanoscale level of the Au-on-nanodiamond deposits have been deeply investigated by electron microscopy (FE-SEM, HR-TEM ) and diffraction (XRD) techniques. Optical properties of these systems have been determined by performing scattering and UV-Vis absorption measurements, and by comparing the experimental data with simulated extinction spectra. The results highlighted very interesting plasmonic and scattering behaviors, mainly related to the high refractive index of diamond. INTRODUCTION Gold nanoparticles and nanodiamonds are two classes of materials that are receiving great attention in several emerging research areas, such as nanophotonics, nanomedicine and nano-biochemistry [1-7]. These and other connected research fields are presently converging toward common goals and their synergistic action is expected to offer practical solutions to technological problems related to optical labelling, imaging, molecular loading and biosensing. In this context it is thought that the coupling of nanodiamonds with Au nanostructures and the investigation of the properties of these exciting hybrid systems could open a new fascinating scenario to the applied scientist community. It is to be noted that, whereas a lot of scientific work has been devoted in the last years to the Au-nanoparticles / diamond systems [8-10], less attention has been given to the task of preparing and characterizing Au-nanoparticles/detonation nanodiamond materials. As regards the detonation nanodiamond [11], an exciting novel member of the nanocarbon family, up to now only in one case its coupling with Au nanoparticles [12] it has proposed. In this paper we describe the decoration of detonation nanodiamond (ND) with Au nanoparticles (NP) and the investigations carried out to test the optical behaviour of the coupled nanostructures. The generation and deposition of the Au nanoparticles is achieved by an electroless route, taking
advantage of an innovative Au(III)-aminoethil imidazolium aurate salt [13], that is mixed with aqueous dispersions of nanodiamond. EXPERIMENT The Au(II
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