AVS 62nd International Symposium & Exhibition
    Scanning Probe Microscopy Focus Topic Thursday Sessions
       Session SP+AS+NS+SS-ThM

Paper SP+AS+NS+SS-ThM3
Adsorption of Trimethyl Acetic Acid on (1x2) Reconstructed TiO2(110)

Thursday, October 22, 2015, 8:40 am, Room 212A

Session: Probing Chemical Reactions at the Nanoscale
Presenter: Kenneth Park, Baylor University
Authors: K. Park, Baylor University
K. Zhu, Baylor University
Y. Xia, Baylor University
Z. Zhang, Baylor University
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The adsorption of trimethyl acetic acid on (1x2) reconstructed TiO2(110) is investigated using scanning tunneling microscopy (STM) with the same area analysis. After de-protonation, trimethyl acetate (TMA) molecules preferentially adsorb in the troughs between two adjacent 1x2 strands. The nearest neighbor distance between TMA molecules is about 5.9 Å, twice the lattice constant along [001], corresponding to the bridging bidentate configuration over two 5-coordinated Ti4+ sites. With increasing coverage, they form linear chains, separated by (1x2) strands leading up to the nominal saturation coverage of 0.25 ML. Upon further adsorption, the second-layer of TMA molecules start clustering on top of 1x2 strands. The coverage-dependent TMA adsorption structures on (1x2) reconstructed TiO2(110) will be compared and discussed with the reported TMA adsorption on (1x1) TiO2(110), and relative reactivity of TMA with other defect sites including cross-links will be presented.