He holds a Bachelor's Degree (2019) and a Master's Degree (2021) in Physics from the Federal University of Santa Catarina (UFSC). He has experience in Condensed Matter Physics, with an emphasis on nanocrystal structure, working on the following topics: Mechanochemistry (MQ) synthesis of cobalt tellurides, X-ray powder diffraction (XRPD), Transmission Electron Microscopy (TEM) and magnetometry. Regarding XRPD knowledge, he has experience in Rietveld structure refinement and in the acquisition of microstructural information of nanomaterials, especially in obtaining mean sizes and distribution of crystallites (with varied shapes) and microdeformation, using profile fit and modeling techniques of diffraction patterns such as: Whole Powder Pattern Modeling (WPPM), Double-Voigt (DV) and Total Scattering. Among the most significant research results are the MQ synthesis of the four crystalline phases (nanometric) of cobalt tellurides and their structural and microstructural characterization. Thus, it was possible to infer its super for magnetic properties through experiments and simulation of magnetic hysteresis loops and to determine the effectiveness of the gamma-CoTe2 phase in the electrochemical detection of ferulic acid. Among the most recent research interests are in the complete determination of the microstrain (density of defects) of materials synthesized via MQ and the high temperature behavior of the nanocrystalline phases of beta-CoTe. These researches demonstrate the advantages and disadvantages of MQ synthesis in the synthesis of transition metal chalcogenides (TMC) and its microstructural characteristics, using a refined characterization, implemented using different experimental techniques.

ORCID: 0000-0003-1053-4711

Research Gate: https://www.researchgate.net/profile/Marcelo-Malagutti-2

https://pubs.rsc.org/en/content/articlelanding/2021/ra/d0ra10716f
 

1^st year

Research activities

CuFeS2 thin film materials were fabricated via ball-milling, thermal evaporation, and sulfurization techniques. The optimization of the synthesis was performed. The films were employed to produce a thermoelectric generator. Further characterization was carried out. Cu2.125Zn0.875SnSxSe4-x (CZTSSe) bulk pallets were produced by ball milling. Their thermoelectric properties were investigated.

Research output

The output of the research for the CuFeS2 thin films was published here: https://doi.org/10.3390/app131810172. The generator performance was measured with the current and voltage characterization system available in the department. Characterization of electronic conductivity, charge carrier concentration, and charge carrier mobility were made via hall-effect measurements. X-ray diffraction was performed for phase identification and microstructural analysis. Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy were also made to investigate the surface morphology and stoichiometry balance of the films. Regarding the CZTSSe, 5 pallets were synthesized. The thermoelectric performance of the bulk pallets was measured, such as electronic conductivity, Seebeck voltage, and thermal conductivity. The resulting figure of merit, related to the thermoelectric efficiency was also estimated from these values. Further X-ray characterization and Raman were performed, at room temperature and high temperatures.

2^nd year

Research activities

Synthesis, characterization, and application of CuFeS2, Cu2SnS3, and Cu2+yZn1-ySnSexS4-x were performed. X-ray studies on the thermal diffuse scattering of monoatomic and diatomic systems were performed.

Research output

The sulfurization process of the CuFeS2 was further improved from last year, with publications here (https://doi.org/10.1021/acsaelm.4c01248). Cu2SnS3 was also synthesized in a similar procedure with results already published (https://doi.org/10.1007/s10853-024-10104-w). The stacking faults mechanism of Cu2+yZn1-ySnSexS4-x were investigated and the optimized doping composition for this system was obtained. Regarding X-ray diffraction theory studies, Pd was employed to investigate the thermal diffuse scattering of monoatomic face-centred cubic structures with results already published (https://doi.org/10.1021/acs.cgd.3c01507). Ag2O served as the test case for binary compounds which is currently published on (https://doi.org/10.1107/S1600576724010756).