Direct-writing of PbS nanoparticles inside transparent porous silica monoliths using pulsed femtosecond laser irradiation
1 Laboratoire de Physique des Lasers, Atomes et Molécules (CNRS, UMR 8523), IRCICA (USR CNRS 3380), CERLA (FR CNRS 2416), Bâtiment P5, Université Lille 1-Sciences et Technologies, F-59655 Villeneuve d'Ascq Cedex, France
2 Laboratoire de Spectrochimie Infrarouge et Raman CNRS UMR 8516 USTL Bât C5, Université Lille 1-Sciences et technologies 59655 Villeneuve d'Ascq Cedex, France
3 Laboratoire des Multimatériaux et Interfaces (CNRS, UMR 5615), Bâtiment Berthollet, 22 Avenue Gaston Berger, Université de Lyon 1, 69622 Villeurbanne Cedex, France
Nanoscale Research Letters 2011, 6:542 doi:10.1186/1556-276X-6-542Published: 4 October 2011
Pulsed femtosecond laser irradiation at low repetition rate, without any annealing, has been used to localize the growth of PbS nanoparticles, for the first time, inside a transparent porous silica matrix prepared by a sol-gel route. Before the irradiation, the porous silica host has been soaked within a solution containing PbS precursors. The effect of the incident laser power on the particle size was studied. X-ray diffraction was used to identify the PbS crystallites inside the irradiated areas and to estimate the average particle size. The localized laser irradiation led to PbS crystallite size ranging between 4 and 8 nm, depending on the incident femtosecond laser power. The optical properties of the obtained PbS-silica nanocomposites have been investigated using absorption and photoluminescence spectroscopies. Finally, the stability of PbS nanoparticles embedded inside the host matrices has been followed as a function of time, and it has been shown that this stability depends on the nanoparticle mean size.