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In2O3 nanocrystals were prepared by injecting In2O3 sols in a coordinating environment at 160 °C. In this way an innovative concept has been achieved, based on the use of self-limitating nanoreactors. By a proper control of the synthesis conditions, differently sized nanocrystals were obtained, the smallest having a size of about 3.5 nm. The nanocrystals were purified by thermal treatments and characterized by X-ray diffraction and high-resolution transmission electron microscopy, showing the presence of nanosized In2O3 single-crystals. Nanocrystals with a size of about 6 nm were dispersed in a solvent and deposited onto alumina substrates with pre-deposited heaters and electrodes. The resulting devices were tested towards ozone gas, obtaining responses ranging over several orders of magnitude even for low (60 ppb) ozone concentrations and short response and recovery times. This result is interpreted as …
Publication date: 
14 Mar 2008

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

Biblio References: 
Volume: 130 Issue: 1 Pages: 483-487
Sensors and actuators B: chemical