Premium
Fabrication of Free‐Standing Titania‐Based Gas Sensors by the Oxidation of Metallic Titanium Foils
Author(s) -
Gouma Pelagia I.,
Mills Michael J.,
Sandhage Ken H.
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01320.x
Subject(s) - rutile , materials science , titanium , fabrication , porosity , metal , copper , titanium oxide , oxide , doping , titanium dioxide , composite material , chemical engineering , metallurgy , optoelectronics , pathology , engineering , medicine , alternative medicine
A simple method for fabricating TiO 2 ‐based sensors of CO( g ) is demonstrated: the oxidation of Ti‐bearing foils. Metallic foils (35 μm thick) were converted into free‐standing, porous rutile foils (60 μm thick) by exposure to O 2 ( g ) at 800°—965°C. The oxidized foils contained thin (0.5—1 μm thick), regularly spaced oxide layers oriented parallel to the external surface. The exposure of such porous foils to increasing concentrations of CO( g ) resulted in a monotonic increase in the steady‐state electrical resistance. Rutile foils sensitive to 50 ppm changes in CO( g ) content with response times of a few minutes were produced. The effects of oxidation conditions and copper doping on sensing performance are discussed.