TY - GEN

T1 - Optimization and characterization of transparent photocatalytic TiO 2 thin films prepared by ion-assisted deposition

AU - Boughaled, Redouan

AU - Schlichting, Sebastian

AU - Ehlers, Henrik

AU - Ristau, Detlev

AU - Bannat, Inga

AU - Wark, Michael

PY - 2008/9/25

Y1 - 2008/9/25

N2 - The term photocatalysis is used to describe a photon-driven catalytic process. Titanium dioxide is a well-known photocatalyst in such fields as self-cleaning material and anti-microbial effects. Besides these photocatalytic applications, TiO2 is a widely-used high index material for optical thin films. In the present investigation, the photocatalytic activity of transparent TiO2 thin films was optimized to achieve multifunctional high precision optical coatings. The films have been deposited by ion assisted deposition (IAD), applying a Leybold APS plasma source as well as a Denton CC-105 ion source. The cause-and-effect chain between the use of different parameters in the IAD process and optical properties of the TiO2 layers as well as their photocatalytic activities are described. As test reaction for the determination of the photocatalytic properties, the degradation of methylene blue (MB) was chosen. The used setup based on a high precision two-path laser measurement system was developed by the LZH in order to determine the kinetic performance of TiO2 catalysts under well-defined UV illumination conditions. Photonic efficiencies of the TiO2 thin films were calculated from the obtained data. Additionally, crystal structure analysis has been investigated for the identification of anatase and rutile modifications. The comparison of the results shows that ion assisted deposition is an appropriate technology for the preparation of photocatalytic active thin films for optical applications.

AB - The term photocatalysis is used to describe a photon-driven catalytic process. Titanium dioxide is a well-known photocatalyst in such fields as self-cleaning material and anti-microbial effects. Besides these photocatalytic applications, TiO2 is a widely-used high index material for optical thin films. In the present investigation, the photocatalytic activity of transparent TiO2 thin films was optimized to achieve multifunctional high precision optical coatings. The films have been deposited by ion assisted deposition (IAD), applying a Leybold APS plasma source as well as a Denton CC-105 ion source. The cause-and-effect chain between the use of different parameters in the IAD process and optical properties of the TiO2 layers as well as their photocatalytic activities are described. As test reaction for the determination of the photocatalytic properties, the degradation of methylene blue (MB) was chosen. The used setup based on a high precision two-path laser measurement system was developed by the LZH in order to determine the kinetic performance of TiO2 catalysts under well-defined UV illumination conditions. Photonic efficiencies of the TiO2 thin films were calculated from the obtained data. Additionally, crystal structure analysis has been investigated for the identification of anatase and rutile modifications. The comparison of the results shows that ion assisted deposition is an appropriate technology for the preparation of photocatalytic active thin films for optical applications.

KW - Ion assisted deposition

KW - Methlyene blue

KW - Optical coatings

KW - Photonic efficiencies

KW - Self-cleaning

KW - Titanium dioxide

UR - http://www.scopus.com/inward/record.url?scp=56349151916&partnerID=8YFLogxK

U2 - 10.1117/12.797719

DO - 10.1117/12.797719

M3 - Conference contribution

AN - SCOPUS:56349151916

SN - 9780819473318

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Advances in Optical Thin Films III

T2 - Advances in Optical Thin Films III

Y2 - 2 September 2008 through 3 September 2008

ER -