Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks

O 51.6: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1C

Plasma Assisted Synthesis and Mechanism of Rare V2O5 Nanostructured Thin Films — •Megha Singh, Prabhat Kumar, and Gade B. Reddy — Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016

Two rare nanostructures of V2O5 using facile plasma assisted sublimation process (PASP) have been synthesized. V2O5 nanoflakes and nanoplates assembled in microspheres (NPMSs) were obtained on large area over nickel coated glass substrate. The temperature of growth is varied along with time duration of deposition in order to obtain the different kinds of nanostructure as well as to understand the role of Ni-seed layer playing in controlling the morphology of nanostructures.

The morphological, structural, and vibrational properties of V2O5 nanostructured thin films are systematically investigated systematically as a function of time and deposition temperatures. Structural analysis carried out using the XRD shows the pure orthorhombic phase of V2O5 and revealed the dependence of crystallinity on the temperature and duration of growth. The Raman study of vanadium and oxygen atoms in nanostructured thin films (NTFs) is carried out by micro-Raman, which evidences the presence of single orthorhombic phase of V2O5 and accorded with XRD results. HRTEM analysis with SAED confirms that NFs and NPMSs are polycrystalline in nature. The stoichiometry ratio obtained from XPS analysis is ~2.4, shows the compositional purity and stoichiometric nature of V2O5 NTFs. Based on the observed results a three steps growth mechanism is proposed.