Kankona Singha Roy

Communicative Scientist proficient in [Skill]. Talented individual educated in safety procedures, processes and regulations. Pursuing role and leveraging exceptional technical knowledge to better satisfy customer needs.vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

• Awarded INSPIRE SCHOLARSHIP given to top 1% students of state/central board for brilliance in 12th Standard Board Examination
• (Central Government), 2011
• Awarded Higher Secondary Council Scholarship for the result in the H.S
• Exam (12th standard), 2011
• Special recognigation from Manishi Swarney Milan Mela,Pandua for academic excellence in the Secondary Exam (10th standard) in Pandua Block attended by Dr
• Ratna Dey Nag (M.P of Hooghly District, West Bengal), 2009, Solid state chemistry centered on inorganic materials (oxide)
• State of the art Electron Beam Lithography to pattern electrodes with channel length as low as 100 nm
• Device fabrication of 1D/2D nanomaterial
• Device Characterization at room temperature as well as low temperature
• Field effect transistor, Interconnects, Metal-insulator Transition (MIT)
• Structure Property relation of solid-state materials
• Synthesis, growth and understanding of complex misfit oxides in bulk as well as in low dimension (1D, 2D)
• Creation of atomic level defects and imaging
• Functionalization of nanomaterials
• Operation of state of art electron microscopy (SEM, TEM) and data interpretation
• Thermoelectric materials for energy generation in 1D/2D nanomaterials
• Defect/strain mediated electrochemical water splitting
• Electrochemical energy storage (supercapacitor, aqueous battery)
• Importance of Surface/interface for electrocatalysis
• Piezoelectric materials and piezoelectricity
• TECHNICAL EXPERIENCE
• Synthetic Techniques:
• Sealed tube high temperature furnace reaction
• Solvothermal/hydrothermal reaction, Co-precipitation method, Chemical Vapor deposition (CVD)
• Solid state synthesis by programmable furnace, use of Schlenk line and vacuum sealing line
• Instrumental Techniques:
• Spectroscopy: NMR, FT-IR, UV-Vis, Fluorescence, XPS, Raman
• Microscopy: SEM (with EDS), TEM (with SAED), STEM (with EELS), AFM
• Others: XRD, CVD, GC, GC-MS, Column Chromatography, HPLC, TGA
• Electrochemistry: CV, LSV, Chrono-ampero/potentiometry, Impedance
• Fabrication: Electron beam lithography (EBL), Photolithography, Sputter, Thermal evaporation, Plasma Asher, Optical microscope, Atomic layer deposition (ALD), Litho SEM
• Device Measurement: Physical Property Measurement System (PPMS), PPMS-VSM, Room/Low temperature Electrical characterization by B1500 series (Probe station), Keithley 4200A-SCS
• Others: Piezoelectric, Dielectric, Ferroelectric measurement INTERNSHIP Applied Materials India Pvt Ltd: Feb 2022-Present
• Demonstrated successful fabrication of microlens array
• Delivered protective polymer coating for optical device
• RESEARCH SUMMARY
• Thesis title: “Studies on Metastable Cobalt Oxide (CoO2) in Low Dimension from Misfit Layered Cobalt Oxide and their Electrical and Electrochemical Properties’’ Supervisor Late Prof
• Leela Srinivas Panchakarla, IIT Bombay
• (2016- present), Fabrication of MOSFET device and investigation of low dimensional (1D) core-shell intercalated CoO2 nanotube as an interconnect for modern day transistor
• Continuous miniaturization of electronics demand development of interconnectors with high ampacity and high conductivity, which conventional conductors such as copper and gold cannot offer
• Here we demonstrated metastable CoO2 in stable nanotubular form structure over SrCoO2-CoO2 misfit nanotubes
• Quasi-one- dimensional Sr6Co5O15 that contains face-sharing octahedron and trigonal prismatic CoO6 is converted in basic hydrothermal conditions to CoO2@SrCoO2-CoO2 nanotubes, where CoO2 adopts a two-dimensional edge- sharing CoO2 layered structure
• Electrical properties measured on individual nanotubes demonstrate that these nanotubes are semiconducting with a conductivity of 1.28×104 S/cm and an ampacity of 109 A/cm2, which is the highest reported to date ampacity value to date in any inorganic material
• The nanotubes also show a breakdown power per unit channel length (P/L) of ~38.3 W/cm, which is highest among all the regularly used interconnect materials
• This work might have a way to synthesize a large class of metastable compounds in a stable form by intercalation that might unravel unique properties, which stable compounds can’t offer
• Synthesis and Stabilization of Metastable CoO2 Nanoscrolls in Low Dimension and their Electrical Properties
• Metastable compounds have been studied for their unique properties such as superconductivity, magnetism etc
• Stabilizing meta stable compounds (kinetic product) have been very challenging as they tend to convert to the more stable thermodynamic for
• Meta-stable two-dimensional CoO2 is prepared in a stable nanoscroll form by converting the quasi-one-dimensional crystal structure of Ca3Co2O6
• Individual nanoscroll shows a semiconducting nature with a high current-carrying capacity of ~7.6 x 106 A/cm2 for a typical FET device and an extremely high breakdown voltage of ~9.2 V even higher than CNT
• As a result, they could be used as interconnect material in high-voltage electronic circuitry
• Tuning the Ampacity and Introducing Voltage Induced Metal to Semiconductor Transition by Tuning the Sr% in SrxCoO2 Nanotubes
• Transition metal oxides that exhibit a metal-to-insulator transition (MIT) as a function of applied Voltage are promising systems to realize energy-efficient platforms for various electrical applications
• Here by tuning the Sr amount in SrxCoO2 we successfully tuned its electrical properties from ampacity to conductivity
• As the Sr content decreases the ampacity of SrxCoO2 nanotubes decreases for e.g on going from x=1 to x=0.1 the ampacity decreases from 109 A/cm2 to as low as 104 A/cm2
• Similarly, tuning of conductivity has also been observed from metal to semiconductor by changing the applied voltage
• Charge transport in SrxCoO2 nanotubes exhibits Mott variable-range-hopping (VRH) conduction and is governed by Efros and Shklovskii-VRH laws
• Disordered structure and Sr tuning both contribute to the transport gap of these nanodevices
• Our study reveals a distinct voltage and Sr%-dependent metal-to-semiconductor transition in a new class of 1D materials, and is of great significance for both fundamental investigations and practical devices such as sensors
• In-situ growth of oxide nanoparticles by introducing non-stoichiometry into misfit bulk Cobaltate for activation of inert electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER)
• Most heterogeneous catalytic reactions demand high density and yet spatially separated nanoparticles that are strongly anchored on the oxide surfaces
• Such nanoparticles can be deposited or synthesized in situ via nonstoichiometric methods
• To date, nanoparticles have been exsolved from perovskite oxide surfaces using nonstoichiometric processes
• However, the density of the space-separated nanoparticles on the oxide surfaces is still low
• And less attention is paid toward the changes that happen to the host during the nanoparticle exsolution process
• In this work, we demonstrated in situ exsolution of ultrafine nanoparticles (∼5 nm) of either Co3O4 or Ca(OH)2 via judicious control of non-stoichiometry in a misfit Ca3Co4O9 (CCO)
• The exsolution process turned the inert host (CCO) into electrocatalytically active toward water splitting
• The observation indicates that the active sites that are produced during the nonstoichiometric synthesis also present in the bulk of the CCO (host)
• We believe that similar nonstoichiometric synthesis can be applied to a wide variety of tricomponent systems, and they could endow the hosts with novel properties for applications such as in catalysis and thermoelectric
• Creation of defects/vacancies, strain inside a crystal by solid state synthesis and exploring its effect on electrochemical water splitting
• Rational construction and smart modification of cost-effective and high-performance electrocatalysts are of great importance for the development of high-efficiency electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER)
• In this work, we proposed a methodology to activate the otherwise inactive but earth-abundant and conductive layered-misfit compound, Ca3Co4O9 (CCO), via orderly deintercalation of cations through the basal plane
• Creation of dual cation defects increases the catalytic activity with a significant drop (~450 mV)
• Density functional theory (DFT) calculations explains the synergetic role of dual cation vacancies in the optimization of the reaction intermediate binding energies on the catalyst surface helping to boost the catalytic performance
• Synthesis and stabilization of intercalated CoO2 nanotube in 1D nanotube and 2D nanosheets by a control of solvothermal and solid-state synthesis and its application in Zn2+ ion aqueous battery
• The gaining attention towards NaxCoO2 and LixCoO2 motivates us to look into alternative transition metal cobaltite system
• Stabilizing CoO2 in 1D and 2D is of great challenge owing to the stability of Co+4 that requires charge transfer from its counter component
• Here, for the 1st time we have studied the kinetics of CaCoO2 intercalated CoO2 nanotube to nanosheets conversion and the contribution of intercalate (CaCoO2) in order to stabilize CoO2
• We have investigated the behavior of both 1D NT and 2D NS as cathode for aqueous Zn ion batteries
• N
• The intercalated CoO2 accommodated Zn2+ ions in the as deposited state and thus could act as an intercalation host during the discharging process
• The kinetic study also reveals an interactive mechanism shows up to 90% capacity retention after 500 cycles
• This paves a way for intercalated CoO2 nanotubes as a future battery material
• MASTERS THESIS
• Thesis title: ‘’Synthesis and Functionalization of Meso-Furyl-3-Pyrrolyl BODIPY and Its Applications’’ Supervisor Prof
• M
• Ravikanth, IIT Bombay (May 2015-May 2016)
• Synthesis and Characterization of several highly fluorescent boron dipyrromethenes (BODIPY) dyes with different substituents
• Studies of absorption, fluorescence and electrochemical properties of newly synthesized 3-Pyrrolyl BODIPYs and investigation on effect of different substituents upon the electronic properties of BODIPYs
• IIT Bombay
• Sample preparation and loading
• Analyse surface morphology, Composite morphology, elemental analysis
• Quantification of the elements19 2019- present 2017- present
• XRD, Department of Chemistry
• IIT Bombay
• Sample preparation and loading
• Analyse data
• Electron Beam Lithography (EBL), CEN, EE
• IIT Bombay
• Sample preparation for fabrication process
• Fabrication of 1D and 2D material device
• Students 2017- present, 1D nanotube to 2D CoO2 flakes: an insight into chemical state and crystal structure (under preparation)
• KS Roy, R Mohanta, LS Panchakarla
• Synthesis of 2D CaCoO2-CoO2 nanosheets and its application in Zn+2 battery (manuscript under preparation)
• KS Roy, C Subramaniam, LS Panchakarla
• Non-Stoichiometry synthesis of Misfit Calcium Cobalt Oxide to Enhance Electrocatalytic Activity towards Water Splitting, Patent No
• 202121003411 (filed)
• ORAL/POSTER PRESENTATION
• In-House Symposium 2016, IIT Bombay; Poster Presentation
• In-House Symposium 2017, IIT Bombay; Oral Presentation
• Newton Bhaba Workshop 2017, Indian Institute of Science Education and Research (IISER) Kolkata; Poster Presentation
• International Workshop on Advanced Materials (IWAM) 2019, Dubai, UAE; Oral Presentation
• Material Research Society (MRS) Spring/Fall meeting 2020; Virtual; Poster presentation
• American Physical Society (APS) March meeting 2021; Virtual; Oral Presentation
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