High-affinity adsorption leads to molecularly ordered interfaces on TiO 2 in air and solution

Balajka, Jan; Hines, Melissa A.; DeBenedetti, William J. I.; Komora, Mojmir; Pavelec, Jiri; Schmid, Michael; Diebold, Ulrike

doi:10.1126/science.aat6752

Title: High-affinity adsorption leads to molecularly ordered interfaces on TiO ₂ in air and solution

Journal Article · Thu Aug 23 00:00:00 EDT 2018 · Science

DOI:https://doi.org/10.1126/science.aat6752· OSTI ID:1466085

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; Komora, Mojmir; Pavelec, Jiri;

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Researchers around the world have observed the formation of molecularly ordered structures of unknown origin on the surface of titanium dioxide (TiO ₂ ) photocatalysts exposed to air and solution. Using a combination of atomic-scale microscopy and spectroscopy, we show that TiO ₂ selectively adsorbs atmospheric carboxylic acids that are typically present in parts-per-billion concentrations while effectively repelling other adsorbates, such as alcohols, that are present in much higher concentrations. The high affinity of the surface for carboxylic acids is attributed to their bidentate binding. These self-assembled monolayers have the unusual property of being both hydrophobic and highly water-soluble, which may contribute to the self-cleaning properties of TiO ₂ . This finding is relevant to TiO ₂ photocatalysis, because the self-assembled carboxylate monolayers block the undercoordinated surface cation sites typically implicated in photocatalysis.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1466085

Journal Information:: Science, Journal Name: Science Vol. 361 Journal Issue: 6404; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 144 works

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