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Highly ordered titanium dioxide nanostructures via a simple one step vapor inclusion method in block copolymer films

DOI: 10.1021/acsanm.8b00632 DOI Help

Authors: Elsa C. Giraud (University College Cork; Trinity College Dublin) , Parvaneh Mokarian-tabari (Trinity College Dublin) , Daniel T. W. Toolan (University of Sheffield) , Thomas Arnold (Diamond Light Source) , Andrew J. Smith (Diamond Light Source) , Jonathan R. Howse (University of Sheffield) , Paul D. Topham (Aston University) , Michael A. Morris (Trinity College Dublin)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Nano Materials

State: Published (Approved)
Published: June 2018
Diamond Proposal Number(s): 10439 , 9328

Abstract: Nanostructured crystalline titanium dioxide (TiO2) finds applications in numerous fields such as photocatalysis or photovoltaics where its physical and chemical properties depend on its shape and crystallinity. We report a simple method of fabricating TiO2 nanowires by selective area deposition of titanium tetraisopropoxide (TTIP) and water in a CVD-based approach at low temperature by utilizing PS-b-PEO self-assembled block copolymer thin film as a template. Parameters such as exposure time to TTIP (minutes to hours), working temperature (~18 to 40 °C) and relative humidity (20 to 70 RH%) were systemically investigated through GISAXS, SEM and XPS and optimized for fabrication of TiO2 nanostructures. The resulting processing conditions yielded titanium dioxide nanowires with a diameter of 24 nm. An extra calcination step (400 – 700 °C) was introduced to burn off the remaining organic matrix and introduce phase change from amorphous to anatase in TiO2 nanowires without any loss in order.

Journal Keywords: titanium dioxide; titanium tetraisopropoxide; block copolymer; polymer templating; chemical vapor deposition; GISAXS

Subject Areas: Materials, Chemistry

Instruments: I07-Surface & interface diffraction , I22-Small angle scattering & Diffraction

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