Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.56: Poster

Wednesday, March 22, 2017, 17:00–19:00, P2-EG

Plasma assisted synthesis of core-multishell nanostructured thin films — •Prabhat Kumar, Megha Singh, and Gade B Reddy — Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016

The ability to modify and tune the properties of core-multishell heterostructures nanoflakes (CMN) enables them to be used in wide range of applications. Firstly, we have carried out the sulfurization of MoO3 nanostructured thin films using H2S/Ar plasma. XRD analysis shows that films after sulfurization have monoclinic MoO2 and hexagonal MoS2 phases. Maximum sulfurization is accomplished at 550°C in 60min. Core-shell was confirmed by the HR-TEM micrographs. XPS analysis shows that in all samples surface was completely sulfurized to form MoS2 with good stoichiometry. From results, it was revealed that the depth of penetration of sulfur species in MoO3, converting it into MoS2 increased with the increase in time and reduction of MoO3 by hydrogen species was much more as compared to sulfur species. Secondly, core-shell heterostructures were treated in O2 plasma for different durations of time. XRD and Raman analysis show that films after oxidation have MoO2, MoS2 along with MoO3. HR-TEM micrographs revealed that nanoflake have acquired CMN. XPS analysis shows that surface consist of Mo oxidation states. The aim of this work is to achieve the appropriate growth conditions to obtain CMNs thin films on different substrates and to control their properties by using various reactive species environment of H2S/Ar and O2 gas plasma.