Temperature-induced phase transition in h-MoO3: Stability loss mechanism uncovered by Raman spectroscopy and DFT calculations

Ultrafast Growth of h-MoO3 Microrods and Its Acetone Sensing Performance

“…However, the relative peak intensities reveal that the {100} plane family is more intense when compared to the standard ICSD card, suggesting an anisotropic crystalline growth of the h-MoO3 phase [10,19]. Raman active modes identified in Figure 1b confirm the metastable hexagonal phase of MoO3 [29]. The bands located at 985-974 cm −1 and 912-880 cm −1 are assigned to the symmetrical and asymmetrical stretching modes, respectively, of the Mo=O double bond.…”

“…The bands located at 985-974 cm −1 and 912-880 cm −1 are assigned to the symmetrical and asymmetrical stretching modes, respectively, of the Mo=O double bond. The several bands appearing between 550-200 cm −1 are mainly related to the Mo-O-Mo vibrations (rocking and scissoring), while the modes below 200 cm −1 are associated to the MoO 6 octahedral vibrations in the h-MoO 3 phase [29].…”

Synthesis of MoO 3 by pilot‐scale combustion reaction and evaluation in biodiesel production from residual oil

“…Figure 4 illustrates the Raman (Figure 4A) and FTIR (Figure 4B) vibrational spectra of MoO 3 catalysts synthesized in this work. The attributions observed in the Raman spectra (Figure 4A) were based on those described in the literature 41‐44 . The vibrational modes that appeared around 600 to 1000 cm −1 correspond to the stretching vibrations of the MoO 6 octahedron, and the modes between 200 and 400 cm −1 originate from the bending vibrations of the MoO 6 octahedron, while the modes below 200 cm −1 are assigned to lattice deformation the MoO 6 octahedron modes 41,44 .…”

“…The attributions observed in the Raman spectra (Figure 4A) were based on those described in the literature. [41][42][43][44] The vibrational modes that appeared around 600 to 1000 cm À1 correspond to the stretching vibrations of the MoO 6 octahedron, and the modes between 200 and 400 cm À1 originate from the bending vibrations of the MoO 6 octahedron, while the modes below 200 cm À1 are assigned to lattice deformation the MoO 6 octahedron modes. 41,44 The bands observed in the 968 to 884 cm À1 range, seen as a differential in the h/α-MoO 3 sample, possibly corresponding to the elastic vibrations of the MoO 6 octahedron in the MoO 3 hexagonal crystal structure, corroborating the studies by Lopez et al 44 Such behavior was also mentioned by Zhang et al, 43 confirming the XRD results (Figure 2B), which indicated that two crystalline phases form the catalyst.…”

Contact Effect in High-Temperature Conjugated Polymer Transistors

“…Another method is the addition of a metal oxide injection layer such as MoO 3 , which can reduce the contact resistance of both BCBG and TCBG devices of several p-type organic semiconductors. − MoO 3 has a high phase transition temperature and thus is much more suitable than thiol SAMs for high-temperature applications. BCBG devices of IID-C1 with an MoO x (5 nm)/Au (25 nm) electrode, patterned by vacuum evaporation on top of OTS-modified SiO 2 substrates, were fabricated.…”