Experimental Insights into the Growth of Single Truncated Anatase Bipyramids |
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| Authors: | Justin R Mulcahy Shuai He Decarle S Jin Wenxiao Guo Sarah Arteta Dr John B Cliff Dr Zihua Zhu Prof Dr Wei David Wei |
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| Institution: | 1. Department of Chemistry, University of Florida, Gainesville, FL, 32611 USA;2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, 99354 USA |
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| Abstract: | Fluorine has been recognized to selectively stabilize anatase titanium dioxide (TiO2) crystal facets; however, resolving its physical location at the nanometer scale remains empirically elusive. Here, we provide direct experimental evidence to reveal the spatial distribution of fluorine on single truncated anatase bipyramids (TABs) using nanoscale secondary ion mass spectrometry (NanoSIMS). Fluorine was found to preferentially adsorb on the (001) facet compared to the (101) facet of TABs. Moreover, NanoSIMS depth profiling exhibited a significantly different fluorine distribution between these two facets in the near-surface region, illustrating the essential role of lattice-doped fluorine in the anisotropic crystal growth of TABs. |
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| Keywords: | crystal growth faceted anatase TiO2 fluorine adsorption SIMS surface chemistry |
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