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

Abstract

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 2selectively 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 2photocatalysis, because the self-assembled carboxylate monolayers block the undercoordinated surface cation sites typically implicated in photocatalysis.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Technische Univ. Wien, Vienna (Austria)
  2. Cornell Univ., Ithaca, NY (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1544005
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 361; Journal Issue: 6404; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics

Citation Formats

Balajka, Jan, Hines, Melissa A., DeBenedetti, William J. I., Komora, Mojmir, Pavelec, Jiri, Schmid, Michael, and Diebold, Ulrike. High-affinity adsorption leads to molecularly ordered interfaces on TiO 2 in air and solution. United States: N. p., 2018. Web. doi:10.1126/science.aat6752.
Balajka, Jan, Hines, Melissa A., DeBenedetti, William J. I., Komora, Mojmir, Pavelec, Jiri, Schmid, Michael, & Diebold, Ulrike. High-affinity adsorption leads to molecularly ordered interfaces on TiO 2 in air and solution. United States. doi:10.1126/science.aat6752.
Balajka, Jan, Hines, Melissa A., DeBenedetti, William J. I., Komora, Mojmir, Pavelec, Jiri, Schmid, Michael, and Diebold, Ulrike. Thu . "High-affinity adsorption leads to molecularly ordered interfaces on TiO 2 in air and solution". United States. doi:10.1126/science.aat6752.
@article{osti_1544005,
title = {High-affinity adsorption leads to molecularly ordered interfaces on TiO 2 in air and solution},
author = {Balajka, Jan and Hines, Melissa A. and DeBenedetti, William J. I. and Komora, Mojmir and Pavelec, Jiri and Schmid, Michael and Diebold, Ulrike},
abstractNote = {Researchers around the world have observed the formation of molecularly ordered structures of unknown origin on the surface of titanium dioxide (TiO2) photocatalysts exposed to air and solution. Using a combination of atomic-scale microscopy and spectroscopy, we show that TiO2selectively 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 TiO2. This finding is relevant to TiO2photocatalysis, because the self-assembled carboxylate monolayers block the undercoordinated surface cation sites typically implicated in photocatalysis.},
doi = {10.1126/science.aat6752},
journal = {Science},
issn = {0036-8075},
number = 6404,
volume = 361,
place = {United States},
year = {2018},
month = {8}
}

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