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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.54: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Synthesis and crystal structure characterization of W5O14 and W18O49 nanowires — •Muhammad Saqib, Maja Remskar, and Janez Jalenc — Institut Jozef Stefan, Condensed matter Physics department, Ljubljana, Slovenia

Compared with other transition metal oxides, tungsten oxides have attracted great attention and have been investigated extensively due to their outstanding electrochromic, optochromic, and gas chromic properties. The individual W5O14 nanowires (NWs) made good ohmic contacts with W and Pt at room temperature and had excellent field-emission properties. Photoelectron spectroscopy revealed the metallic conductivity of the W5O14 NWs, which was confirmed by direct-transport measurements on a double stranded NWs. Here we report on achieving of reduction of tungsten three oxides to different sub- oxides nanowires by adding of elemental tungsten into the growth process. W5O14 and W18O49 nanowires are synthesized by the transport reaction in the presence of nickel as growth promoter and iodine as transport agent. The scanning electron microscope revealed rigid W5O14 and W18O49 NWs. Morphology and current-voltage characteristics of individual W5O14 NWs put on graphite were measured by scanning tunneling microscope operating in ultra-high vacuum. Surface structure of the W5O14 NWs was found affected by tunneling current, particularly on the NWs with weak interaction with the substrate. The work function of the NWs has been determined by Kelvin microscopy in non-contact atomic force microscopy operating in ultra-high vacuum.