Berlin 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 27: Nanostructures: Low Dimensions
O 27.6: Talk
Tuesday, March 17, 2015, 15:15–15:30, MA 005
1D-WO3 nanochannel structures used for efficient H2-sensing — •Ole Pfoch1, Marco Altomare1, and Patrik Schmuki1,2 — 1Department of Material Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany — 2Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia
1D nanostructures of vertically aligned channels of amorphous WO3 up to ca. 4 µm length were grown by means of self-organizing electrochemical anodisation. By preliminary screening experiments, the anodisation conditions were optimized so to obtain highly ordered nanochannels with pore diameter of ca. 10 nm. With a proper thermal treatment the anodic WO3 can be converted into crystalline structures. SEM, EDX, XRD, XPS, TEM and SAED are used to further investigate the physical-chemical properties of the WO3 layers. Since WO3 is known to show a rapid response to reducing gases such as H2 and nanostructures are promising candidates for fabricating gas sensors due to their high surface area, gas sensing experiments are performed. Thereby the structures are found to exhibit outstanding gas-sensing abilities such as a fast response at low temperatures (80-120∘C) even down to concentrations as low as 0.5 ppm.