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In2O3 nanocrystals were prepared by injection of In2O3 sol in a hot (160 °C) solution of tetradecene and an amine. By properly controlling the amine chain length, the processing of the starting sol and the heat-treatment temperature, In2O3 nanocrystals with a size ranging from 4 to 10 nm were obtained. The nanocrystals suspensions could be easily processed by drop-coating onto alumina substrates to obtain gas-sensing devices. The devices displayed an enormous response to ozone gas, with a response of several orders of magnitude even to 60 ppb of ozone. In particular, the monitoring of low ozone concentrations was possible even by operating at room temperature, where the ozone concentration profile could be rapidly and reversibly monitored. The enhanced gas-sensing properties were explained as the cooperative effect of the nanocrystal size and surface chemistry, characterized by high densities of …
American Chemical Society
Publication date: 
20 Sep 2007

Mauro Epifani, Elisabetta Comini, Jordi Arbiol, Eva Pellicer, Pietro Siciliano, Guido Faglia, Joan R Morante

Biblio References: 
Volume: 111 Issue: 37 Pages: 13967-13971
The Journal of Physical Chemistry C