Thermal diffusivity of molybdenum oxide nanowire film: A photothermal beam deflection study

• Published in: Optics and laser technology Vol. 139; p. 106993
• Main Authors: Soumya, S., Arun Kumar, R., Raj, Vimal, Swapna, M.S., Sankararaman, S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2021; Elsevier BV
• Subjects: Atomic force microscopy; Diffusivity; Emission analysis; Field emission microscopy; Molybdenum oxide; Molybdenum oxides; Molybdenum trioxide; Morphology; Nanowires; Photothermal beam deflection; Photothermal deflection spectroscopy; Standardization; Thermal diffusivity; Thin films; Molybdenum oxide; Thermal diffusivity; Photothermal beam deflection; Nanowires
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2021.106993

•Quantum confined effects in nanowires (NWs) make it technologically significant.•Investigates the thermal diffusivity of MoO3 NW films by mirage technique.•MoO3 NW film exhibit a thermal diffusivity, 9.48% of the bulk counterpart.•Study reveals the potential of MoO3 NW for thermoelectrics and optronics applications. The paper reports the preparation of thin film with MoO3 nanowires (NWs) by the doctor blade method and the study of its thermal diffusivity (α) by the sensitive photothermal beam deflection (PTD) method. When the Field Emission Scanning Electron Microscopic and Atomic Force Microscopic analysis unveil its morphology as NW bundles, the X-ray diffraction analysis reveals the structure to be orthorhombic. The NWs formed are of diameter ~ 20 nm and length up to 5 μm. The standardization of the transverse PTD setup is done by determining the value of α of iron, which agrees well with literature reports. The thermal diffusivity of MoO3 NW film is obtained as 0.0036 cm2/s, which is 9.48% of its bulk counterpart. The reduction in the thermal diffusivity of NW makes it a suitable candidate for thermoelectric applications.