2022 Spring Graduate Colloquium Series: Jared Pohlmann

DateApril 1, 2022
Time3:35 - 5:00 pm
LocationBaylor Sciences Building, Room E.125
Description
2022 Spring Graduate Colloquium Series


Jared Pohlmann


Carboxylate Adsorption on Rutile TiO2 (100):
Role of Coulomb Repulsion and Steric Hindrance


Understanding the adsorption and photoactivity of acetic acid and trimethyl acetic acid on TiO2 surfaces is important for improving the performance of photocatalysts and dye-sensitized solar cells. A structural study was done of
adsorption on rutile TiO2(100)-1 × 1 and -1 × 3 using Scanning Tunnelling Microscopy and Density Functional Theory calculations. Exposure of both
terminations to acetic acid gives rise to a ×2 periodicity in the [001] direction (i.e., along Ti rows). The DFT calculations suggest that the preference of c(2 × 2) over the 2 × 1 periodicity found for TiO2(110)-1 × 1 can be attributed
to an increase in interadsorbate Coulomb repulsion. Exposure of TiO2(100)-1 × 1 and -1 × 3 to trimethyl acetic acid gives rise to largely
disordered structures due to steric effects, with quasi-order occurring in small areas and near step edges where these effects are reduced.



Watch on Zoom at the following:

https://baylor.zoom.us/j/81099493181?pwd=a3hNQ2ttNGVSUTZTYkNyLll0V2JGUT09

Meeting ID: 810 9949 3181

Passcode: 948528


For more information contact: Dr. Anzhong Wang 254-710-2276

PublisherDepartment of Physics
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