Nanoporous Nanostructured Tin Dioxide Materials

Sample S%et (m g M Total Pore Volume (cm ) Mean Pore Diameters (nm) Mean Crystallite Size s (nm) C/Sn (at%) 

Among all the precursors studied, precursor 2a appears to be the most useful precursor of nanocrystalline mesoporous Sn02 for application purposes. In comparison with 2d and 2f, compound 2a provides pure cassiterite tin dioxide materials with very low amounts of carbon from calcination at 400 °C, owing to the rather facile elimination of the p-phenylene spacer. After calcination at 400 and 500 °C, the BET surface area (110 and 70 m g ), the mean pore size diameter (5 and 6.5 nm) and the mean crystallite size (4.5 and 7 nm) are close to those reported for tin dioxide materials prepared by the template method after 

In summary, the nature of the hybrid therefore allows, to some extent, the control of both texture and morphology of the tin dioxide materials obtained after calcination. Nevertheless, treatment at 500 °C leads to similar BET surface area and mean crystallite size, which shows that annealing at very high temperature erases completely the fingerprint of the organic linker. 

Gomez-Romero and C. Sanchez, Functional Flybrid Materials, Wiley-VCH Weinheim, 2003. 

Boutet, B. Jousseaume, T. Toupance, M. Biesemans, R. Willem, C. Labrugere, and L. Delattre, Chem. Mater, 17, 1803 (2005). 

---