An All Low-Temperature Fabrication of Macroporous, Electrochemically Addressable Anatase Thin Films

作者：Schroeder Michael; Sallard Sebastien; Boehm Matthias; Einert Marcus; Suchomski Christian; Smarsly Bernd M^*; Mutisya Stephen; Bertino Massimo F

来源：Small, 2014, 10(8): 1566-1574.

DOI：10.1002/smll.201300970

• sol-gel processes
• template synthesis
• macroporous films
• colloid dispersion
• UV treatment

Macroporous TiO2 (anatase) thin films are fabricated by an all low-temperature process in which substrates are dip-coated in suspensions of mixed anatase nanoparticles and polystyrene beads, and the templating agents are removed by ultraviolet (UV) irradiation at a temperature below 50 degrees C. Scanning electron microscopy (SEM) and Raman spectroscopy show that the templating polymer beads are removed by UV irradiation combined with the photocatalytic activity of TiO2. X-Ray diffraction reveals that nanoparticle growth is negligible in UV irradiated films, while nanoparticle size increases by almost 10 times in calcined films that are prepared for comparison. The macroporous films are prepared on FTO-(fluorine-doped tin oxide) coated glass and ITO (indium tin oxide) coated flexible plastics and thereby used as working electrodes. In both cases, the films are electrochemically addressable, and cyclic voltammetry is consistent with the response of bulk TiO2 for calcined films and of nanoscale-TiO2 for UV-irradiated films.

• 出版日期2014-4