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SnO2 and In2O3 nanocrystals were prepared by injecting the corresponding metal oxide sols in solutions of amines in organic solvents at 160 °C, followed by heating at the resulting temperature (80–110 °C) for 3 h. The obtained nanoparticles were extracted by centrifugation, washed and heat-treated at 500 °C for final purification and eventual completion of the crystallization process. The preparation process and the final products were characterized by X-ray diffraction, Raman and Fourier transform infrared spectroscopy and transmission electron microscopy. Very small nanoparticles with a mean size of about 6 nm were obtained, generally constituted by single crystals, chemically pure and defect free. The nanocrystals could be suspended in various solvents, and then deposited by dropping onto alumina substrates with pre-deposited heaters and electrodes. The resulting gas-sensing devices were tested to …
Publication date: 
20 Sep 2007

Mauro Epifani, Raül Díaz, Jordi Arbiol, Elisabetta Comini, Nicolas Sergent, Thierry Pagnier, Pietro Siciliano, Guido Faglia, Joan R Morante

Biblio References: 
Volume: 126 Issue: 1 Pages: 163-167
Sensors and Actuators B: Chemical