Titanium-doped chromium oxide

Peter C., Kneer, J. and Wdllenstein, J. (2011), Inkjet printing of titanium doped chromium oxide for gas sensing application, Sens Lett, 9,1-5. 

Titanium/chromium oxide (Ti/Cr203 + Ti02) composite electrodes, fabricated by a ceramic method [168], may be used for oxidation of organic compounds. The chromium is oxidized to Cr03, which chemically oxidizes the substrate. The hfetime of the electrode may be improved by doping with Sb203. 

Compared to the relatively young history of the pure metal, aluminium compounds have been known for ages from the above-cited alum class to the more exclusive transition metal-doped aluminium oxides like ruby and sapphire (corundum varieties with chromium for the former and titanium and iron impurities for the latter) or aluminosilicate-like emeralds (a beryl type with chromium and vanadium impurities). However, to the synthetic chemist, aluminium chloride, is de facto one of the first jewels of the aluminium family. Aluminium trichloride (together with titanium tetrachloride, tin tetrachloride and boron trifluoride) is an exemplary Lewis acid that finds many applications in organic synthesis It is extensively used for instance in Friedel-Crafts alkylations and acylations, in Diels-Alder-type cycloadditions and polymerisation reactions. Its involvement in a wide range of reactions has been documented in many reviews and book chapters. ... 

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