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Fabrication of platinum nanoparticles by laser ablation in water

AutorSanz, M. ; Oujja, M.; Castillejo, Marta ; Cueto, Maite ; Gámez, F.; Martínez-Haya, Bruno
Fecha de publicaciónmay-2011
CitaciónThe European Materials Research Society (EMRS) 2011 Spring Meeting, 9-13 de mayo de 2011. Niza, Francia
ResumenNoble metal nanoparticles have attracted much interest due to the large number of applications among them their use as substrates for laser desorption ionization (LDI) mass spectrometry. Laser ablation constitutes an advantageous technique to synthesize metal nanoparticles by irradiating a metallic target in aqueous solution as their size distribution and concentration can be controlled by adequate choice of laser wavelength and pulse duration. In this work, aqueous suspensions of platinum colloidal nanoparticles of varying size and polydispersity were produced in solution by ablation with a Q-switched Nd:YAG laser (pulse 5 ns). Several laser wavelengths, (1064, 532 and 266 nm) and stabilizing agents, such as PEG, PVA, PVP and citrate, were employed and their influence on the obtained nanoparticles was determined. The size, morphology, structure and optical properties of the colloids were investigated by transmission electron microscopy and UV-VIS absorption spectroscopy. IR ablation leads to nanoparticles with mean diameter of 10 nm and a broad size distribution (width 5 nm). The nanoparticle size is significantly reduced upon UV ablation (2 nm mean diameter, 0.3 nm distribution width) which also yields crystalline nanoparticles. Moreover at 266 nm the use of PVA yielded crystalline Pt nanorods of  10 x 70 nm2. The obtained colloids serve to fabricate nanostructured films capable of assisting LDI of low molecular weight (m/z < 1500) polymeric and biomolecular analytes.
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