Chemically driven isothermal closed space vapor transport of MoO₂: thin films, flakes and in situ tellurization

Abstract

A novel procedure, based in a closed space vapor transport (CSVT) configuration, has been devised to grow films or flakes of pure MoO2 in a reductive atmosphere, at relatively low temperature and using MoO3 as the source. In contrast with conventional CSVT technique, in the proposed method a temperature gradient is not required for the growth to take place, which occurs through an intermediate volatile transport species that is produced in the complex reduction reaction of MoO3. An added value of this simple method is the possibility of transforming the MoO2 into MoTe2, one of the most interesting members of the transition metal dichalcogenide family. This is achieved in a sequential process that includes the growth of Mo oxide and its (in-situ) tellurization in two consecutive steps.

Optical and electrical properties of MoO2 and MoO3 thin films prepared from the chemically driven isothermal close space vapor transport technique

“…In a previous paper, we have developed a method to obtain pure MoO2 films by a chemically driven isothermal close space vapor transport technique (CD-ICSVT) using MoO3 as the precursor source. 9 Moreover, the obtained MoO2 films can be further oxidized to be converted into pure MoO3. This provides an excellent opportunity for the study of the properties of these two pure phases.…”

Interfacial strain defines the self-organization of epitaxial MoO2 flakes and porous films on sapphire: experiments and modelling

“…The results of this calculations were tested through the growth of MoO2/(001) Al2O3 heterostructures with different growth parameters. For the growth experiments we used a technique reported in a previous work [8]: the chemically-driven isothermal close space vapour transport (CD-ICSVT). This technique allows to prepare pure MoO2 films under a flow of reductive H2 atmosphere and with MoO3 as source material.…”

Laser Fluence Dependence of the Electrical Properties of MoO2 Formed by High Repetition Femtosecond Laser Pulses

“…This oxide is of great interest to be used as anode in lithium ion batteries . It can be obtained as single crystal, powder, thin films, and various nanostructures as: ultrathin nanosheets, etc . Nowadays, several methods have been employed to obtain MoO 2 .…”

“…[21] It can be obtained as single crystal, powder, thin films, and various nanostructures as: ultrathin nanosheets, etc. [6][7][8]22] Nowadays, several methods have been employed to obtain MoO 2 . For instance, molybdenum dioxide powder has been obtained by chemical reduction of MoO 3 or through the hydrothermal method.…”