1. Measuring Thermal Diffusivity of Azoheteroarene Thin Layers by Photothermal Beam Deflection and Photothermal Lens MethodsAmeneh Mikaeeli, Dorota Koret, Humberto Cabrera, Dariusz Chomicki, Dariusz Dziczek, Oksana Kharchenko, Peng Song, Junyan Liu, Andreas D. Wieck, Michal Pawlak, 2023, izvirni znanstveni članek Ključne besede: thin films, photothermal spectroscopy, thermal transport, thermal wave, thermal conductivity, thermal diffusivity
Objavljeno v RUNG: 21.09.2023; Ogledov: 66; Prenosov: 0
 Celotno besedilo (882,88 KB) |
2. Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens SpectrometryVladislav Khabibulin, Mladen Franko, Mikhail Proskurnin, 2023, izvirni znanstveni članek Opis: Thermal-lens spectrometry is a sensitive technique for determination of physicochemical
properties and thermophysical parameters of various materials including heterogeneous systems
and nanoparticles. In this paper, we consider the issues of the correctness (trueness) of measurements
of the characteristic time of the thermal-lens effect and, thus, of the thermal diffusivity determined
by dual-beam mode-mismatching thermal lensing. As sources of systematic errors, major factors—
radiation sources, sample-cell and detector parameters, and general measurement parameters—are
considered using several configurations of the thermal-lens setups, and their contributions are
quantified or estimated. Furthermore, with aqueous ferroin and Sudan I in ethanol as inert colorants,
the effects of the intermolecular distance of the absorbing substance on the correctness of finding the
thermophysical parameters are considered. The recommendations for checking the operation of the
thermal-lens setup to ensure the maximum accuracy are given. The results obtained help reducing
the impact of each investigated factor on the value of systematic error and correctly measure the
thermophysical parameters using thermal-lens spectrometry.
Ključne besede: thermal-lens spectrometry, accuracy and trueness, mode-mismatched schematic, measurements of thermal diffusivity
Objavljeno v RUNG: 20.01.2023; Ogledov: 615; Prenosov: 7
Celotno besedilo (9,88 MB) |
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4. Influence of P3HT:PCBM Ratio on Thermal and Transport Properties of Bulk Heterojunction Solar CellsDorota Korte, Egon Pavlica, Domen Klancar, Gvido Bratina, Michal Pawlak, Ewa Gondek, Peng Song, Junyan Liu, Beata Beata Derkowska-Zielinska, 2023, izvirni znanstveni članek Ključne besede: organic bulk-heterojunction solar cells, polymer-fullerene solar cells, photothermal beam
deflection spectrometry, non-radiative recombination, thermal diffusivity, frequency domain methods
Objavljeno v RUNG: 09.01.2023; Ogledov: 670; Prenosov: 14
Celotno besedilo (2,58 MB) |
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9. Thermal diffusivity downscaling of molybdenum oxide thin film through annealing temperature-induced nano-lamelle formation: a photothermal beam deflection studyS. Soumya, Vimal Raj, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman, 2021, izvirni znanstveni članek Opis: The present work proposes a method of downscaling the thermal diffusivity (α)
of MoO3 thin films through annealing temperature-induced nano-lamelle formation. The
thermal diffusivity modification of the MoO3 films, prepared by the doctor blade method,
is investigated by the sensitive transverse photothermal beam deflection technique. The X-ray diffraction analysis confirms the structural phase transformation from monoclinic to
orthorhombic in the films annealed from 300 to 450 °C. The thermal induced anisotropy of
the film is evident from the variation of the morphology index and texture coefficient. The
field emission scanning electron microscopic analysis unveils the morphology modifications
from blocks to the nano-lamelle structure with layers of average thickness ~ 77 nm. The
thermal diffusivity measurement reveals a 53% reduction upon annealing the film to 450 °C.
The drastic reduction is achieved through the annealing temperature-induced nano-lamelle
formation and the phase transformation from monoclinic to orthorhombic in the MoO3 films.
Ključne besede: thermal diffusivity, molybdenum oxide, thin film, nano-lamelle, photothermal beam deflection
Objavljeno v RUNG: 04.07.2022; Ogledov: 665; Prenosov: 24
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10. Thermal diffusivity of molybdenum oxide nanowire film: a photothermal beam deflection studySwapna Mohanachandran Nair Sindhu, 2021, izvirni znanstveni članek Opis: 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.
Ključne besede: Nanowires
Molybdenum oxide
Photothermal beam deflection
Thermal diffusivity
Objavljeno v RUNG: 04.07.2022; Ogledov: 667; Prenosov: 0
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