New low temperature environmental friendly process for the synthesis of 
tetragonal MoO2 and its field emission properties

Nishanthi, S.T.; Baruah, Arabinda; Yadav, Krishna Kumar; Sarker, Debalaya; Ghosh, Santanu; Ganguli, Ashok K.; Jha, Menaka

doi:10.1016/j.apsusc.2018.10.173

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New low temperature environmental friendly process for the synthesis of tetragonal MoO₂ and its field emission properties

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Sarker, Debalaya
Theory, Fritz Haber Institute, Max Planck Society;
Department of Physics, Indian Institute of Technology;

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Citation

Nishanthi, S., Baruah, A., Yadav, K. K., Sarker, D., Ghosh, S., Ganguli, A. K., et al. (2019). New low temperature environmental friendly process for the synthesis of tetragonal MoO₂ and its field emission properties. Applied Surface Science, 467-468, 1148-1156. doi:10.1016/j.apsusc.2018.10.173.

Cite as: https://hdl.handle.net/21.11116/0000-0002-8950-9

Abstract

Molybdenum dioxide (MoO₂) with tetravalent molybdenum normally exists in three structural polymorphs: monoclinic, tetragonal and hexagonal. Though significant efforts have been noticed for the synthesis of monoclinic MoO₂, there are very few reports on the stabilization of tetragonal MoO₂ in ambient atmosphere. We have developed a cost-effective and environmental friendly process for the synthesis of highly crystalline tetragonal MoO₂ in cooking oil at low temperature (200 °C) and ambient pressure. The as-obtained MoO₂ shows a band gap of 2.39 eV, which is comparatively lower than microsheets (4.22 eV). The field emission study of tetragonal MoO₂ shows low turn-on field of 3.25 V/μm and attained a maximum current density of ∼55 μA/cm² at an applied field of 5.8 V/μm. Thus, we have shown the tetragonal MoO₂ nanosheets can be used as materials for field emission displays and microelectronic devices. Thus, the present work opens up new possibilities of stabilization of tetragonal MoO₂ via economical as well as environmental friendly route and it can be used as an electron emitter for various electronic devices.