论文信息 - Luminescence and Absorption of Hybrid Xerogels Doped with PbS Nanoparticles Prepared by Gas Diffusion Method

Luminescence and Absorption of Hybrid Xerogels Doped with PbS Nanoparticles Prepared by Gas Diffusion Method

Transparent hybrid organic-inorganic ureasil xerogels with embedded PbS nanoparticles were prepared by exposing the xerogels doped with lead (II) nitrate to hydrogen sulphide atmosphere. Absorbance spectrum of the nonocomposites showed well defined peaks at 560 nm and 370 nm attributed to 1s(v) - 1s(c) and 1s(v) - 2p(c) exciton transitions, respectively. After four days of thermal treatment at 50 °C under argon atmosphere the obtained materials showed enhanced photoluminescence response in the near infra-red region.

Carlos Silva | V. Boev | M. Gomes | A. Solovyev | Julia T. Gonçalves

[1] S. Risbud,et al. Synthesis, Optical Spectroscopy and Ultrafast Electron Dynamics of PbS Nanoparticles with Different Surface Capping , 2000 .

[2] John D. Mackenzie,et al. Zirconia-ormosil films doped with PbS quantum dots , 1999 .

[3] A. Martucci,et al. Influence of the Host Matrix on the Microstructure of Sol-Gel Films Doped with CdS and PbS Q-Dots , 1998 .

[4] G. Berkovic,et al. Quantum dots of cadmium sulfide in thin glass films prepared by sol—gel technique , 1991 .

[5] Masayuki Nogami,et al. Preparation of Small‐Particle‐Size, Semiconductor CdS‐Doped Silica Glasses by the Sol–Gel Process , 1990 .

[6] Carlos Silva,et al. Incorporation of CdS nanoparticles from colloidal solution into optically clear ureasilicate matrix with preservation of quantum size effect , 2006 .

[7] P. Judeinstein,et al. Hybrid organic–inorganic materials: a land of multidisciplinarity , 1996 .

[8] P. Lefebvre,et al. Quantum confinement effects of CdS nanocrystals in a sodium borosilicate glass prepared by the sol‐gel process , 1995 .