SFB 1214 - TP B4 Structure formation in confined colloidal rod-sphere mixtures

  • Sonderforschungsbereiche
  • FB Physik
  • SFB 1214 "Anisotropic Particles as Building Blocks"
  • FB Chemie
  Kalb, Julian; Dorman, James A.; Gerigk, Melanie; Knittel, Vanessa; Plüisch, Claudia S.; Trepka, Bastian; Lehr, Daniela; Wittemann, Alexander; Polarz, Sebastian; Schmidt-Mende, Lukas (2018): Influence of substrates and rutile seed layers on the assembly of hydrothermally grown rutile TiO2 nanorod arrays Journal of Crystal Growth ; 494 (2018). - S. 26-35. - ISSN 0022-0248. - eISSN 1873-5002

Influence of substrates and rutile seed layers on the assembly of hydrothermally grown rutile TiO<sub>2</sub> nanorod arrays

Rutile TiO<sub>2</sub> nanorod arrays (NRAs) are applicable in various prospective technologies. Hydrothermal methods present a simple technique to fabricate such NRAs. In this report, we present the fabrication of seed layers for the hydrothermal growth of rutile TiO<sub>2</sub> nanorods via sputter deposition, electron-beam evaporation, and sol-gel method and study the influence of each on the growth behavior. To satisfy the requirements of numerous applications, p-type silicon, platinum, levitating carbon membranes, a template made of polystyrene spheres, and commercial fluorine tin oxide (FTO) were employed as substrates. We document the structural properties of the TiO<sub>2</sub> seed layers and describe the relationship between the characteristics of the seed crystals, the growth evolution, and the appearance of as-grown nanorods. Various growth stages of rutile TiO<sub>2</sub> nanorods are compared depending on whether they are grown on polycrystalline TiO<sub>2</sub> or FTO seed layers. In both cases, a homogenous TiO<sub>2</sub> bottom layer is formed at the seed layer/substrate interface, which is essential for electronic applications such as hybrid solar cells. Detached NRAs illustrate the effect of rutile FTO and TiO<sub>2</sub> on the porosity of this bottom layer. Further details about the formation process of this layer are obtained from the growth on confined seed layers fabricated by electron-beam lithography.

Origin (projects)

Funding sources
Name Project no. Description Period
SFB591/16SFB 1214no information
Further information
Period: 01.07.2016 – 30.06.2020