Details

Autor(en) / Beteiligte

• Baker, David R.
• Kamat, Prashant V.

Titel

Photosensitization of TiO2 Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures

Ist Teil von

• Advanced functional materials, 2009-03, Vol.19 (5), p.805-811

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• TiO2 nanotube arrays and particulate films are modified with CdS quantum dots with an aim to tune the response of the photoelectrochemical cell in the visible region. The method of successive ionic layer adsorption and reaction facilitates size control of CdS quantum dots. These CdS nanocrystals, upon excitation with visible light, inject electrons into the TiO2 nanotubes and particles and thus enable their use as photosensitive electrodes. Maximum incident photon to charge carrier efficiency (IPCE) values of 55% and 26% are observed for CdS sensitized TiO2 nanotube and nanoparticulate architectures respectively. The nearly doubling of IPCE observed with the TiO2 nanotube architecture is attributed to the increased efficiency of charge separation and transport of electrons. Anodically etched TiO2 nanotubes are sensitized with CdS quantum dots using the successive ionic layer adsorption and reaction (SILAR) method to compare the photoelectrochemical responses between one dimensional substrate architectures and nanoparticulate systems. Significant increases in photocurrent and incident photon to charge carrier efficiency are found with the nanotube architecture due to the directionality of the system reducing recombination rates.