Temperature response of luminescent tris(bipyridine)ruthenium(II)-doped silica nanoparticles

MARTÍN MIRENDA, VALERIA LEVI, MARIANO LUIS BOSSI, LUCIANA BRUNO, ANDREA V. BORDONI, ALBERTO E. REGAZZONI, ALEJANDRO WOLOSIUK.

JOURNAL OF COLLOID AND INTERFACE SCIENCE

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: Amsterdam; Año: 2013 vol. 392 p. 96 - 101

0021-9797

Nanoparticle-based temperature imaging is an emerging field of advanced applications. Herein, the sensitivityof the phosphorescence of tris(bipyridine)ruthenium(II)-doped silica nanoparticles towards temperatureis studied. 130 nm size particles were prepared by a modification of Stöber?s method, that allowsthe incorporation of Ru[(bpy)3]2+ into the outer particle shell. The entrapped Ru[(bpy)3]2+ retains itsphotophysical properties, yet the emission of the particles is not affected by the presence of O2, neitherby anionic quenchers; quenching by MV2+, on the other hand, is strongly dependent on pH. Between 20and 60 C, the steady-state emission of the particles decreases linearly with increasing temperature. Theslope of the straight line diminishes slightly on thermal cycling, but soon stabilizes. Fluorescence measurementsby scanning confocal microscopy indicate that the silica nanoparticles doped withRu[(bpy)3]2+ can indeed be employed to probe thermal processes in micro-environments