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8 pags. ; 6 figs.Platinum nanomaterials are the focus of great expectations to expand the reach of modern sensor technology. In this work, we have\udevaluated the ability of different types of platinum nanoparticles to enhance the response of analytical techniques based on optical excitation methods, namely nanoparticle-assisted laser esorption/ionization (NALDI), Raman scattering (SERS), and infrared absorption (SEIRA). Physical (laser ablation) and chemical (redox) methods of synthesis have\udbeen employed to produce spherical particles with sizes ranging from a few to tens of nanometers, stabilized with different coating agents. The nanoparticles have then been tested as active substrate materials to\udenhance the sensitivity of NALDI of a model peptide (angiotensin I) and a synthetic polymer (PEG600) and those of SERS and SEIRA of a common chromophore (rhodamine 6G). A fairly similar overall. © 2014 American Chemical Society\udperformance is found for nanoparticles homogeneous in size synthesized by chemical reduction as for heterogeneous sets of\udparticles produced either chemically or by laser ablation in solution. These results indicate that size monodispersity is not crucial\udto attain enhancement effects. Quantitative differences in the relative NALDI, SERS, and SEIRA responses are attributed to the\uddifferent roughness and porosity of the nanoparticles. The use of a low weight coating agent for nanoparticle stabilization also\udleads to a better performance compared to bulkier polymeric coatings.Funding from the Ministry of Science and Innovation of Spain (MICINN) under Projects CSD2007-00058, CTQ2010-15680, and CTQ2012-32345 and from Junta de Andalucia and FEDER\udunder Project P09-FQM-4938 is acknowledged. M.O. and M.S. thank CSIC and CAM Geomateriales S2009/MAT 1629),\udrespectively, for contracts.Peer reviewe

Platinum Nanoparticles as Photoactive Substrates for Mass Spectrometry and Spectroscopy Sensors