Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.55: Poster

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

Fascinating vanadium oxide nanostructured thin films for sensing applications — •Megha Singh, Prabhat Kumar, and Gade B. Reddy — Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016

Vanadium oxides (V-O) have enticed scientists and researchers due to their various properties offering wide optical band gap, good thermal and chemical stabilities. This makes oxides of vanadium, highly suitable, to be used in wide variety of devices applications including sensing. It is essential for any device to be employed in sensing applications to have high aspect ratio and surface area. We report the synthesis of vanadium oxide nanostructured thin films (NTFs) over wide area (400 mm2) using a novel technique plasma assisted sublimation process (PASP). Vanadium oxide NTFs were synthesized on glass substrates in N2 plasma and N2 gas. SEM micrographs show rod like morphology of microstructures with flake like nanostructures on the surface revealing very high surface area. HRTEM images of film revealed that flake like morphology as was observed in SEM, confirming results obtained on morphological studies. XRD and Raman spectroscopic studies confirm long range order in reduced V2O5 (O/V ratio ~ 2.2) indicating structures are highly crystalline in nature. In absence of plasma, the crystallinity as well as surface morphology deteriorated, thereby indicating important role of plasma in microstructure, nanostructure as well as crystal structure of vanadium oxides NTFs with different stoichiometry. Hence, high surface area nanostructured thin films are obtained for sensing applications.