Mixed Oxide Films for gas sensing and photo-catalytic applications
EMSL Project ID
19853
Abstract
The proposed research is a joint effort between WSU and EMSL laboratory at PNNL to study mixing between specific oxide-oxide systems and understand the mixing mechanisms under 2 different processes. The oxides of interest have important applications in gas sensing and photo catalysis.We propose to investigate mixing mechanisms in mostly immiscible oxides of W, Ti, Mo, V, Ta , Hf and Nb . We will pursue three specific aims in pursuit of this objective.
(1)Study the role selective sublimation process in achieving mixing between oxide-oxide systems
(2) Study of ion induced mixing in oxide systems
(3)Optical and Photo-catalytic measurements in mixed oxide systems.
he proposed research is a joint effort between WSU and EMSL laboratory at PNNL to study mixing between specific oxide-oxide systems and understand the mixing mechanisms under 2 different processes. The oxides of interest have important applications in gas sensing and photo catalysis.
We propose to investigate mixing mechanisms in mostly immiscible oxides of W, Ti, Mo, V, Ta , Hf and Nb . We will pursue three specific aims in pursuit of this objective.
(1)Study the role selective sublimation process in achieving mixing between oxide-oxide systems.
(2) Study of ion induced mixing in oxide systems.
(3)Optical and Photo-catalytic measurements in mixed oxide systems.
Oxide films of selected transition metals will be deposited on single crystal substrates by metalorganic decomposition technique. The substrates will be chosen based on their structure and lattice match with the oxide films in an attempt to grow epitaxial or in plane oriented films. Films will also be deposited by reactive sputter deposition technique for comparison. Films of appropriate thickness will be subjected to (a) thermal selective sublimation process and (b) inert ion bombardment at the interface to achieve mixing between oxide-oxide systems. The epitaxial growth of the oxide films, ion bombardment induced damage and subsequent mixing if any at the interface will be investigated with ion beam analysis techniques. XRD and Raman spectroscopy will also be employed for structural analysis of the films before and after mixing. Films which show mixing will be used to investigate changes in optical and photo-catalytic properties.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2006-09-01
End Date
2009-09-30
Status
Closed
Released Data Link
Team
Principal Investigator