NANODEV Research Group

Synthesis of Zeo-type Materials (ETS-10 and AM-6)

ETS-10 is a 3-dimensional 12-membered microporous structure containing corner-sharing SiO4 tetrahedra and TiO6 octahedra linked through oxygen atoms with a pore size of about 4.9 x 7.6 A ° , which draws attention due to its possession of 1-D quantum confined form of titania along two perpendicular directions. The thin film form of ETS-10, supported on conductive ITO coated glass, glass, alfa-alumina and stainless steel substrates was tested for several different applications such as separation, solar cells, fuel cells and photochromism. The unique  properties such as multiple oxidation states of vanadium and high thermal stability make microporous vanadosilicate molecular sieves promising materials for various applications such as catalysis. Among them, vanadosilicate AM-6, isostructural with ETS-10, is a 3-D, 12-membered microporous zeo-type material, consisting of SiO4 tetrahedra and VO6 octahedra. Unlike ETS-10, AM-6 has 1-D ...V-O-V-O-V... quantum wires instead of ...Ti-O-Ti-O-Ti... with narrower band gap compared to titanosilicate ETS-10 (i.e., 3.8 vs. 4.3 eV, for AM-6 and ETS-10, respectively). These quantum wires have the potential to be used as building blocks in nanoscale electronic devices. AM-6, which is also photocatalytically active undervisible light, has unique catalytic properties due to; (1) redox-active transition metal center, (2) accessibility of multiple oxidation states, (3) effectiveness in oxidation chemistry. Furthermore, AM-6 has novel magnetic and electric properties attributed to the valence state of vanadium in VO32- quantum wire which could be easily manipulated by altering the oxidation state of vanadium.