Abstract

A titanium chloromethoxide solution was prepared by reacting TiCl(4) with methanol, followed by water addition. The starting solutions were characterized by Fourier Transform Infrared (FTIR) spectroscopy, evidencing that the in situ generated water results in early hydrolysis of the chloroalkoxide. The solution was reacted with molten dodecylamine at room temperature, obtaining a white slurry of amorphous titania nanoparticles. Stable, redispersible TiO(2) nanocrystals could be prepared by subsequent solvothermal treatment in oleic acid at 250 A degrees C. The use of oleic acid was essential for obtaining crystalline structures, while other surfactants prevented crystallization. The nanocrystals were characterized by X-ray Diffraction and Transmission Electron Microscopy, confirming the formation of anatase TiO(2) nanocrystals with a mean size of 3.3 nm. The TiO(2) nanocrystals were used for fabricating gas-sensing devices, which were tested towards ethanol vapors. The initial small size of the nanocrystals, and the limited size growth during the high-temperature sensor operation, result in remarkable sensing performances if compared with bulk titania sensors.

Autore Pugliese

• Epifani Mauro Salvatore , Siciliano Pietro Aleardo

Tutti gli autori

• Epifani M.; Comini E.; Faglia G.; Arbiol J.; Andreu T.; Pace G.; Siciliano P.; Morante J.R.

Titolo volume/Rivista

Journal of sol-gel science and technology

Anno di pubblicazione

2011

ISSN

0928-0707

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

Non Disponibile