Low-Temperature Fabrication of Mesoporous Titania Thin Films. (5th June 2017)

• Record Type: Journal Article
• Authors: Song, Lin; Körstgens, Volker; Magerl, David; Su, Bo; Fröschl, Thomas; Hüsing, Nicola; Bernstorff, Sigrid; Müller-Buschbaum, Peter
• Is Part Of: MRS advances. Volume 2:Number 43(2017)
• Page Start: 2315
• Page End: 2325
• Publication Date: 2017-06-05
• Subjects: sol-gel, -- thin film, -- scanning electron microscopy (SEM); Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2017.406
• Languages: English
• ISSNs: 2059-8521

Abstract

ABSTRACT: Mesoporous titania films are prepared via the polymer-template assisted sol-gel synthesis at low temperatures, using the titania precursor ethylene glycol-modified titanate (EGMT) and the diblock copolymer polystyrene-block-polyethyleneoxide (PS-b-PEO). UV-irradiation is chosen as a low temperature technique to remove the polymer template and thereby to obtain titania sponge-like nanostructures at processing temperatures below 100 °C. After different UV irradiation times, ranging for 0 h to 24 h, the surface and inner morphologies of the titania films are studied with scanning electron microscopy (SEM) and grazing incidence small-angle x-ray scattering (GISAXS), respectively. The evolution of the band gap energies is investigated using ultraviolet/visible (UV/Vis) spectroscopy. The findings reveal that 12 h UV-treatment is sufficient to remove the polymer template from the titania/PS-b-PEO composite films with a thickness of 80 nm, and the determined bad gap energies indicate an incomplete crystallization of the titania nanostructures.