The construction of materials presenting complex hierarchical structures is a particularly interesting challenge for the materials chemistry. Recently, hierarchical structure performed by assemblage of oxides [1], metals [2] or semiconductor nanoparticles [3], and mesoporous materials (MCM41 and MCM48) have been produced. These structures are highly ordered and show tuneable chemical, physical and mechanical properties, varying opportunely the chemical nature of guest-host species. These hierarchical structures could have applications in catalysis, separation processes, supports, highly efficient adsorbents, molecular hosting processes and sensors.
We report the synthesis and characterization of mesoporous silica (MCM41) containing CdS nanoparticles. MCM41 was synthesised using CTAB micelles as template; its structure was determined by X-ray diffraction (XRD); the CdS nanoparticles were synthesised using a water in oil microemulsion as reaction media.
The heptane containing CdS-amine capped nanoparticles was added to MCM41; CdS nanoparticles spontaneously localized inside MCM41 pores giving the CdS-MCM41 material.
The obtained hierarchical material was characterised using IR, UV-Vis, ATR, fluorescence spectroscopies and XRD and Small Angle Neutron Scattering (SANS) techniques. The spectroscopic investigation gave the size, polidispersity, surface and morphological properties of nanoparticles. SANS and XRD investigation gave structural information such as mesoporous structure, pore size and nanoparticles localization.

[1] Dharmesh Kumar, S. Bera, A.K. Tripathi, G.K. Dey, N.M. Gupta "Uranium oxide nanoparticles dispersed inside the mesopores of MCM-48: synthesis and characterization" Microporous and Mesoporous Materials 66 (2003) 157-167.
[2] Jin-Seung Jung, Won-Sik Chae, Robert A. McIntyre, Candace T. Seip, John B. Wiley, an
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1. NANOMETRIC SEMICONDUCTOR PARTICLES IN MESOPOROUS SILICA: SYNTHESIS AND CHARACTERIZATION
2. SYNTHESIS OF NANOSIZED POWDERS Nd-DOPED YAG BY COPRECIPITATION AND MICROEMULSION METHODS