| About this Abstract |
| Meeting |
2011 Electronic Materials Conference
|
| Symposium
|
2011 Electronic Materials Conference
|
| Presentation Title |
C3, Role of Ethylene on Thermal and Chemical Stability of TiO2(110) |
| Author(s) |
Yuya Murata, Vania Petrova, Ivan Petrov, Suneel Kodambaka |
| On-Site Speaker (Planned) |
Yuya Murata |
| Abstract Scope |
Using in situ high-temperature (700-1000 K) scanning tunneling microscopy (STM), in combination with density functional theory (DFT), we studied the influence of ethylene on the surface dynamics of rutile-structured TiO2(110). STM images were acquired as a function of time, oxygen and ethylene partial pressure, and temperature. During annealing in ultra-high vacuum, we observe the reduction of TiO2(110)-1x1 to TiO2(110)-1x2 due to the desorption of oxygen atoms from the surface. In presence of oxygen, the opposite behavior, i.e. conversion of Ti-rich TiO2(110)-1x2 to TiO2(110)-1x1 is expected and was observed. Interestingly, in the presence of a gas mixture composed primarily of ethylene with small amounts of oxygen, we observed an enhanced rate of conversion from Ti-rich surface to stoichiometric TiO2(110)-1x1 and an associated accumulation of surface mass. That is, we observe a net increase in the surface coverage of Ti and O atoms at a rate that increases with increasing ethylene pressure and decreasing temperature. We attribute this surprising result to the ethylene-catalyzed dissociation of O2 molecules on TiO2(110). |
| Proceedings Inclusion? |
Undecided |