Tetraisobutyl titanate appears as a dark yellow oily liquid with an alcohol-like odor. Insoluble in water and about the same density as water. May irritate or burn on contact.
Precursors for depositing group 4 metal-containing films
申请人:Lei Xinjian
公开号:US08471049B2
公开(公告)日:2013-06-25
Described herein are Group 4 metal-containing precursors, compositions comprising Group 4 metal-containing precursors, and deposition processes for fabricating conformal metal containing films on substrates. In one aspect, the Group 4 metal-containing precursors are represented by the following formula I:
wherein M comprises a metal chosen from Ti, Zr, and Hf; R and R1 are each independently selected from an alkyl group comprising from 1 to 10 carbon atoms; R2 is an alkyl group comprising from 1 to 10 carbon atoms; R3 is chosen from hydrogen or an alkyl group comprising from 1 to 3 carbon atoms; R4 is an alkyl group comprising from 1 to 6 carbon atoms and wherein R2 and R4 are different alkyl groups. Also described herein are methods for making Group 4 metal-containing precursors and methods for depositing films using the Group 4 metal-containing precursors.
Résumé An efficient and economical protocol for the synthesis of 5-substituted-1H-tetrazoles from various nitriles and sodium azide is reported using nano TiO2/SO42− as an effective heterogeneous catalyst. A wide variety of aryl nitriles underwent [3 + 2] cycloaddition to afford tetrazoles in good to excellent yields.
Doped Titanium Dioxide Coatings and Methods of Forming Doped Titanium Dioxide Coatings
申请人:SHARMA PRAMOD K.
公开号:US20100062032A1
公开(公告)日:2010-03-11
Methods for forming doped titanium dioxide coatings are disclosed. Sol-gel compositions are prepared having at least one dopant, are formed on a substrate, and heated at a temperature sufficient to form a doped anatase titanium dioxide coating. Doped titanium dioxide coatings having at least one of improved antimicrobial properties, self-cleaning properties, hydrophilicity, and/or activation time are also disclosed. Substrates comprising such coatings are also disclosed.
Energy Transfer Enables 1.53 μm Photoluminescence from Erbium-Doped TiO<sub>2</sub>Semiconductor Nanocrystals Synthesized by Ar/O<sub>2</sub>Radio-Frequency Thermal Plasma
Highly crystalline, highly luminescent nanopowders of Er3+‐doped TiO2 have been successfully synthesized via one‐step Ar/O2 radio‐frequency thermal plasma processing. Energy transfer from the TiO2 host to Er3+ activators has been confirmed by combined means of UV‐vis, excitation, and photoluminescence spectroscopies. As a consequence, bright photoluminescence at ∼1.53 μm was observed from the nanopowders either by directly exciting the Er3+ activator or by exciting the TiO2 host lattice. A comparative study shows that the nanopowder of the same system made via coprecipitation lacks the energy transfer. The plasma‐generated nanopowders may thus find applications in optoelectronic devices.