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Structure of a superhydrophilic surface: wet chemically prepared rutile-TiO2 (110)(1×1)

DOI: 10.1021/acs.jpcc.9b00245 DOI Help

Authors: Jon P. W. Treacy (University of Manchester) , Hadeel Hussain (The University of Manchester) , Xavier Torrelles (Institut de Ciència de Materials de Barcelona (CSIC)) , Gregory Cabailh (Sorbonne Université, UMR CNRS 7588) , Oier Bikondoa (University of Warwick) , Christopher Nicklin (Diamond Light Source) , Geoff Thornton (London Centre for Nanotechnology and Department of Chemistry, University College London) , Robert Lindsay (The University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: February 2019

Abstract: Surface X-ray diffraction (SXRD) has been employed to quantitatively determine the geometric structure of an X-ray-induced superhydrophilic rutile-TiO2(110)(1×1) surface. A scatterer, assumed to be oxygen, is found at a distance of 1.90 ± 0.02 Å above the fivefold co-ordinated surface Ti atom, indicating surface hydroxylation. Two more oxygen atoms, situated further from the substrate, are also included to achieve the optimal agreement between experimental and simulated diffraction data. It is concluded that these latter scatterers are from water molecules, surface localised through hydrogen bonding. Comparing this interfacial structure with previous studies suggests that the superhydophilicity of titania is most likely to be a result of the depletion of surface carbon contamination, coupled with extensive surface hydroxylation.

Subject Areas: Chemistry


Instruments: I07-Surface & interface diffraction