LINXS Guest Seminar
Learn about the development and characterization of new materials with potential future applications in energy and sustainability!
When: 25 October, 14:00–15:00 (CET)
Where: at LINXS (Scheelevägen 19, Lund), with digital participation possibility (Zoom). https://www.linxs.se/events/2023/10/25/linxs-guest-seminar-carlos-campos
Title: Characterization and applications of mechanochemically synthesized Chalcogenide powders
Speaker: Prof Carlos Campos, Department of Physics at the Federal University of Santa Catarina (UFSC) in Brazil
ABSTRACT
The combination of several experimental techniques and the microstructural modeling including the volume-weighted diameter size, surface-weighted ’true’ crystallite size for an ellipsoidal domain shape as well as the Debye Function (DFA) overcome conventional methods of analysis (notably the Rietveld method) that fail to consider important information contained in diffuse scattering, typically of disordered and/or nanometric materials.
This seminar is devoted to showing some results on these modeling for the Fe56Te44 and CoxTe100-x (with x = 32, 34, and 40) samples. Moreover, a brief overview of novel electrochemical sensors based on carbon paste electrodes (CPE) will be delivered. For instance, (CPE)/Ni3-xTe2 applied for the simultaneous detection of the neurotransmitters dopamine (DA) and adrenaline (AD) in phosphate buffer solution (pH 7.0), a CPE/NiTe2 successfully applied to morin determination in high, medium, and low polyphenols content red wines such as Tannat, Cabernet Sauvignon, and Pinot Noir, as well as the γ-CoTe2 nanocrystals (γ-CoTe2/GCE) with outstanding sensing abilities for ferulic acid. All the Iron, Nickel, and Cobalt Telluride composites were prepared by mechanochemical route in just a few hours and carefully characterized by X-ray diffraction, calorimetry, transmission electron microscopy, Raman spectroscopy, and magnetometry techniques.
At the end of the presentation, a few perspectives of complementary characterization using neutrons and synchrotrons will be presented with a focus on thermoelectric materials.
