TiO2 Nanopowders for Sensing Applications; A Comparison between Traditional and Hydrothermal Synthesis Way

Marco Nagliati; M.C. Carotta; S. Gherardi; Isidoro Giorgio Lesci; G. Martinelli

doi:10.4028/www.scientific.net/AST.45.205

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 45TiO2 Nanopowders for Sensing Applications; A...

TiO₂ Nanopowders for Sensing Applications; A Comparison between Traditional and Hydrothermal Synthesis Way

Abstract:

Aim of the work is to compare the morphological properties of TiO2 powders obtained by different methods. The microstructure of powders is a fundamental parameter to judge if the material is suitable for gas sensing. Materials for chemical sensors have to be composed by nanometric and spherical shaped grains sintered in controlled conditions aimed to obtain Schottky barriers. We investigated a traditional sol-gel (SG) and an hydrothermal (HY) approach to obtain titanium dioxide powders. The same starting materials were chosen for both SG and HY method, a Ti-organometallic precursor and, as solvent, an hydroalcoholic solution. The work is focused on the different methodology and on the outcome related to the two methods (we describe step by step both of them). HY TiO2 powder shows smaller grains than SG TiO2 maintaining spherical shape. A comparison among different handled HY powders shows the role of dwelling time (at fixed temperature) on the nanostructure of grains. Experimental observations are mainly based on XRD and SEM analyses.

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Periodical:

Advances in Science and Technology (Volume 45)

Pages:

205-208

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.205

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Online since:

October 2006

Authors:

Marco Nagliati, M.C. Carotta, S. Gherardi, Isidoro Giorgio Lesci, G. Martinelli

Keywords:

Hydrothermal Synthesis, Sol-Gel Synthesis, Thermal Stability, TiO₂

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