Subhajit Das Email & Phone Number

Columbus, Oh, Us

Columbus, Ohio, United States

• Worked directly on a national-level project (NSF-funded) showing the first implementation of the advanced high-average power, ultrafast laser technology, in the United States, initially developed by the European Extreme Light Infrastructure (ELI)• Served as a graduate student in the 1 KW laser of 10 mJ at 100 kHz, with pulse duration down to 10 fS, will generate attosecond to femtosecond Extreme Ultraviolet (XUV) pulses by High Harmonic Generation (HHG) to investigate the movement of… Show more • Worked directly on a national-level project (NSF-funded) showing the first implementation of the advanced high-average power, ultrafast laser technology, in the United States, initially developed by the European Extreme Light Infrastructure (ELI)• Served as a graduate student in the 1 KW laser of 10 mJ at 100 kHz, with pulse duration down to 10 fS, will generate attosecond to femtosecond Extreme Ultraviolet (XUV) pulses by High Harmonic Generation (HHG) to investigate the movement of electrons in molecules and materials at attosecond time scales and angstrom length scales.• Served as part of the design team and completed ~700 hours (to date) of field related work experience on this project • Handled vacuum compatible optics, gained experienced in laser alignment, and exposed to an ultrahigh vacuum system using turbo pump.• Expanded skill set to include experience working in a clean room following regulatory processes and procedures • Gained international exposure and experience participating on a dynamic team of diverse individuals from various fields in science and engineering including physics, materials science, computer science, and chemistry Show less

Columbus, Ohio, United States

Cu-Ti-based metal oxide-heterostructure formed with two semiconductors is a promising photocatalyst for hydrogen evolution reactions using H2O. It is inexpensive, has a visible-light absorption capacity, and has favorable band alignment to hydrogen reduction potential. However, there needs to be a concrete understanding of the interfacial charge dynamics of materials, as there is a conflict in the literature on this topic.• Fabricated samples using the Denton DV-502A E-Gun Evaporator tool… Show more Cu-Ti-based metal oxide-heterostructure formed with two semiconductors is a promising photocatalyst for hydrogen evolution reactions using H2O. It is inexpensive, has a visible-light absorption capacity, and has favorable band alignment to hydrogen reduction potential. However, there needs to be a concrete understanding of the interfacial charge dynamics of materials, as there is a conflict in the literature on this topic.• Fabricated samples using the Denton DV-502A E-Gun Evaporator tool for Cu and AJA Orion RF/DC Sputter Deposition tool for Titanium-based oxide. • Used a programmable furnace for part of the sample synthesis process.• Carried out photoelectrochemical measurements like Linear Sweep Voltammetry (LSV) and Gas Chromatography (GC) with illuminated sample conditions.• Performed XPS to characterize the composition of samples and SEM for the catalysts’ surface morphology• Implemented carrier-specific, element-specific with femtosecond time-resolution table-top HHG-based optical pump/X-ray Ultraviolet (XUV)-probe-spectroscopy to study charge dynamics of the compound and used MATLAB for data analysis. Show less

Bengaluru, Karnataka, India

• Completed 2256 hours at of intensive file experience serving as research assistant in a laboratory under the direct guidance and supervision of faculty member, Professor Kanishka Biswas, Ph.D. • Discovered a series of novel solid-state frameworks and studied optical properties in perovskite halides nanocrystals using temperature-dependent PL-spectroscopy to elucidate the structure and origin of specific light-matter interaction of metal halides, respectively. • Developed and optimized… Show more • Completed 2256 hours at of intensive file experience serving as research assistant in a laboratory under the direct guidance and supervision of faculty member, Professor Kanishka Biswas, Ph.D. • Discovered a series of novel solid-state frameworks and studied optical properties in perovskite halides nanocrystals using temperature-dependent PL-spectroscopy to elucidate the structure and origin of specific light-matter interaction of metal halides, respectively. • Developed and optimized solution-based synthetic conditions using hot‐injection method, anti‐solvent reprecipitation method along with solvothermal/hydrothermal reaction using programmable oven.• Experienced in solid state synthesis of materials, metal halides and metal chalcogenides involving mechanochemistry (ball-milling and mortar-pestle) and high temperature-based process using automated furnace, sealed tube, Schlenk line, and sealed tube. • Collaborated with researchers from different labs to conduct characterization powder X-ray diffraction (powder-XRD), TEM, FESEM, TGA, FT-IR, and DSC. Show less

Bengaluru, Karnataka, India

Photoluminescence color tuning is an important aspect for optical application. Single material emitting visible-NIR photons is challenging to get in the field of research.• Implemented halide mixing approach and lanthanide doping strategy in two-dimensional Sb-based perovskite halides nanocrystal to get photons in visible and NIR-regime. • Used solid-state mechanochemical grinding in inert atmosphere-based glove box for bulk sample preparation.• Synthesized Sb-based perovskite… Show more Photoluminescence color tuning is an important aspect for optical application. Single material emitting visible-NIR photons is challenging to get in the field of research.• Implemented halide mixing approach and lanthanide doping strategy in two-dimensional Sb-based perovskite halides nanocrystal to get photons in visible and NIR-regime. • Used solid-state mechanochemical grinding in inert atmosphere-based glove box for bulk sample preparation.• Synthesized Sb-based perovskite halides nanocrystals using hot-injection synthetic method.• Characterized samples by optical studies using UV/Vis/NIR photoluminescence study (at room temperature and 77K), PXRD as well as Raman spectroscopy for phase analysis.• Performed TGA for knowing the thermal stability of samples.• Implemented TEM and SEM for morphology as well as elemental composition determination. Show less

Doctor Of Philosophy - Phd, Chemistry

M.Sc., Chemistry, 2Nd Rank

B.Sc., Chemistry, First Class