Journal article Open Access

X-Ray Absorption Spectroscopy of TiO2 Nanoparticles in Water Using a Holey Membrane-Based Flow Cell

Petit, Tristan; Ren, Jian; Choudhury, Sneha; Golnak, Ronny; Lalithambika, Sreeju SN; Tesch, Marc F; Xiao, Jie; Aziz, Emad F


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    <subfield code="a">This project was mainly funded by the Volkswagen Foundation (Freigeist Fellowship No. 89592).</subfield>
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    <subfield code="a">Tesch, Marc F</subfield>
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    <subfield code="u">Helmholtz Zentrum Berlin für Materialien und Energie</subfield>
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    <subfield code="u">Helmholtz Zentrum Berlin für Materialien und Energie</subfield>
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    <subfield code="u">Helmholtz Zentrum Berlin für Materialien und Energie</subfield>
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    <subfield code="a">Petit, Tristan</subfield>
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    <subfield code="a">X-Ray Absorption Spectroscopy of TiO2 Nanoparticles in Water Using a Holey Membrane-Based Flow Cell</subfield>
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    <subfield code="a">Diamond materials for the photocatalytic conversion of CO2 to fine chemicals and fuels using visible light</subfield>
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    <subfield code="a">&lt;p&gt;Many applications of TiO2 nanoparticles, such as photocatalytic water splitting&lt;br&gt;
or water remediation, occur in aqueous environment. However, the&lt;br&gt;
impact of solvation on TiO2 electronic structure remains unclear because&lt;br&gt;
only few experimental methods are currently available to probe nanoparticle&amp;ndash;&lt;br&gt;
water interface. Soft X-ray absorption spectroscopy has been extensively&lt;br&gt;
used to characterize the electronic structure of TiO2 materials, but so far&lt;br&gt;
only in vacuum conditions. Here, oxygen K edge and titanium L edge X-ray&lt;br&gt;
absorption spectroscopy characterization of TiO2 nanoparticles measured&lt;br&gt;
directly in aqueous dispersion is presented. For this purpose, a new method&lt;br&gt;
to probe nanomaterials in liquid using a holey membrane-based flow cell is&lt;br&gt;
introduced. With this approach, the X-ray transmission of the membrane is&lt;br&gt;
increased, especially in the water window, compared to solid membranes.&lt;/p&gt;</subfield>
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