TY - JOUR

T1 - Effect of the TiO2-ZnO Heterostructure on the Photoinduced Hydrophilic Conversion of TiO2 and ZnO Surfaces

AU - Rudakova, Aida V.

AU - Emeline, Alexei V.

AU - Bahnemann, Detlef W.

PY - 2019/4/11

Y1 - 2019/4/11

N2 - The present study demonstrates the effect of the composition and structure of TiO2-ZnO heterostructured coatings on the photoinduced hydrophilic conversion of TiO2 and ZnO surfaces. It has been observed that the kinetic parameters of the photoinduced hydrophilic conversion can be significantly changed. Based on the analysis of the experimental data and the proposed mechanism, it is concluded that the ratio between the surface concentrations of electrons and holes participating in the photoinduced generation and deactivation of hydrophilic surface sites plays the major role in this alteration of the surface hydrophilicity of such heterostructured coatings. The ratio between the surface concentrations of electrons and holes can be changed considerably by the formation of the so-called type II heterojunction between TiO2 and ZnO, yielding an effective charge separation. The proposed approach based on the creation of these type II heterostructures seems to be promising and productive both for fundamental studies of the photoinduced surface superhydrophilicity and for the application of self-cleaning coatings with controlled wettability.

AB - The present study demonstrates the effect of the composition and structure of TiO2-ZnO heterostructured coatings on the photoinduced hydrophilic conversion of TiO2 and ZnO surfaces. It has been observed that the kinetic parameters of the photoinduced hydrophilic conversion can be significantly changed. Based on the analysis of the experimental data and the proposed mechanism, it is concluded that the ratio between the surface concentrations of electrons and holes participating in the photoinduced generation and deactivation of hydrophilic surface sites plays the major role in this alteration of the surface hydrophilicity of such heterostructured coatings. The ratio between the surface concentrations of electrons and holes can be changed considerably by the formation of the so-called type II heterojunction between TiO2 and ZnO, yielding an effective charge separation. The proposed approach based on the creation of these type II heterostructures seems to be promising and productive both for fundamental studies of the photoinduced surface superhydrophilicity and for the application of self-cleaning coatings with controlled wettability.

KW - ZINC-OXIDE

KW - FILMS

KW - SUPERHYDROPHILICITY

KW - PHOTOCONDUCTIVITY

KW - PHOTOCATALYSIS

KW - WETTABILITY

KW - COATINGS

KW - WATER

UR - http://www.scopus.com/inward/record.url?scp=85064333545&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.8b12125

DO - 10.1021/acs.jpcc.8b12125

M3 - статья

AN - SCOPUS:85064333545

VL - 123

SP - 8884

EP - 8891

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 14

ER -