Photoactive Ru Complex Embedded in Mesostructured MCM-41 Nanoparticles
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The synthesis and characterization of photoactive hybrid materials based on [Ru(bpy)3]2+ physically adsorbed within the channels of mesoporous MCM-41 silica nanoparticles is presented. A set of photoactive mesostructured hybrids with different guest loading has been prepared and characterized by X-ray diffraction, High Resolution Transmission Electron Microscopy, volumetric analyses, Diffuse Reflectance UV-Vis and Photoluminescence spectroscopies and lifetime measurements. The hybrids synthesis and the washing procedures, performed to investigate the host-guest interaction and the stability of the complex within the mesopores, didn’t affect the integrity of the structure and morphology of MCM-41 nanoparticles. The dispersion of [Ru(bpy)3]2+ within the channels varied depending on the loading value and this is reflected in the different and peculiar photoluminescence features of the resulting hybrid materials. Photoluminescence spectroscopy evidenced that the use of MCM-41 nanoparticles ensures a better dispersion of the complex within the mesopores, if compared with traditional MCM-41. Further studies are in progress to investigate the interesting and promising features exhibited by such photoactive systems for advanced applications of electrochemiluminescence in optoelectronics and diagnostics.
KeywordsMCM-41 nanoparticles [Ru(bpy)3]2+ Photoactive nanoparticles Hybrid materials Photoluminescence
This work has been carried out in the frame of the Regione Piemonte CIPE 2004, D67 project. The authors acknowledge Compagnia di San Paolo for sponsorship to NIS—Centre of Excellence. IM thanks Piedmont Region for financial support. Authors would like to thanks Mr G. Bonagemma. Authors are also grateful to Prof. P. Civera, Prof. D. Demarchi and Dott. R. Canova (CHI-Lab Laboratory—DELEN Dipartimento di Elettronica—Politecnico di Torino) for preliminary ECL investigations.
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