Surface Structure of Protonated R-Sapphire (1$$\bar{1}$$02) Studied by Sum-Frequency Vibrational Spectroscopy

Journal Article · Wed Mar 23 00:00:00 EDT 2011 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja104042u· OSTI ID:1082195

Sung, Jaeho; Zhang, Luning; Tian, Chuanshan; Waychunas, Glenn A.; Shen, Y. Ron

Sum frequency vibrational spectroscopy was used to study the protonated R-plane (1$$\bar{1}$$02 ) sapphire surface. The OH stretch vibrational spectra show that the surface is terminated with three hydroxyl moieties, two from AlOH₂ and one from Al₂OH functional groups. The observed polarization dependence allows determination of the orientations of the three OH species. The results suggest that the protonated sapphire (1$$\bar{1}$$02 ) surface differs from an ideal stoichimetric termination in a manner consistent with previous X-ray surface diffraction (crystal truncation rod) studies. However, in order to best explain the observed hydrogenbonding arrangement, surface oxygen spacing determined from the X-ray diffraction study requires modification.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Earth Sciences Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 1082195
• Report Number(s): LBNL-5399E
• Journal Information: Journal of the American Chemical Society, Vol. 133, Issue 11; Related Information: Journal Publication Date: 2011; ISSN 0002-7863
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE