ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
Aim of the work is to compare the morphological properties of TiO2 powders obtained bydifferent methods. The microstructure of powders is a fundamental parameter to judge if thematerial is suitable for gas sensing. Materials for chemical sensors have to be composed bynanometric and spherical shaped grains sintered in controlled conditions aimed to obtain Schottkybarriers. We investigated a traditional sol-gel (SG) and an hydrothermal (HY) approach to obtaintitanium dioxide powders. The same starting materials were chosen for both SG and HY method, aTi-organometallic precursor and, as solvent, an hydroalcoholic solution. The work is focused on thedifferent methodology and on the outcome related to the two methods (we describe step by stepboth of them). HY TiO2 powder shows smaller grains than SG TiO2 maintaining spherical shape. Acomparison among different handled HY powders shows the role of dwelling time (at fixedtemperature) on the nanostructure of grains. Experimental observations are mainly based on XRDand SEM analyses
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.205.pdf