Name:
Dr. Bikas C. Das
Country:
India
City:
Kolkata
State/Province:
West Bengal
ACS Member:
Local Section:
International Chapter:
Technical Division Membership:
Technical Division Membership Emeritus:
Subdivision Member:
ACS Activities:
Company/Institution Name:
Career Stage:
Professional
Research and Special Interests:
Synthesis of highly functionalized graphene by the method of exfoliation of graphite to graphene oxide and then graphene oxide to graphene following standard methods. Then I want to functionalize them according to experimental requirements for electronic property study and device applications like transparent electrode, composite materials with organic and inorganic nanomaterials etc.
Tuning of electronic properties like transport gap, conductivities of semiconducting substrate passivated by organic, inorganic or hybrid semiconducting nanomaterials with the help of Scanning Tunneling Microscope.
Synthesis and characterization of various doped and undoped inorganic quantum dots, nanorods and nanowires and their use in different device applications.
Use of functionalized Carbon Nanotubes (CNTs) in various electronic and optoelectronic device applications.
Bistable memory device fabrication from monolayer to bulk thin film with organic, inorganic and hybrid nanomaterials as active materials and characterize them by measuring direct and tunneling current.
Study the effect of functional group and also different interfaces in different type of organic semiconductor for nanoscale electronics with the help Scanning Probe Microscopy.
Photovoltaic effects with hybrid quantum dot thin film.
Synthesis and characterization of various hybrid organic-inorganic core-shell quantum dots, nanorods and nanowires and their use in different device applications like hybrid LED, solar cell, FET, sensor etc.
Area of Expertise:
I am describing very shortly about my research experience. Experimental Condensed Matter Physics is my research field of interest. There are three major parts in my research like active materials preparation, thin film device fabrication and electronic or optoelectronic device characterizations. Active materials are organic semiconductors (such as polymers, organic dye etc), binary quantum dots (such as CdSe, CdS, PbS, PbSe etc), metallic quantum dots (such as Au, Ag etc), doped and undoped metal oxide nanomaterials (such as ZnO, TiO2), hybrid organic-inorganic core/shell nanomaterials and graphene. These materials were prepared and functionalized by me in our research laboratory except organic molecules. Quantum dots were synthesized via aqueous or high temperature method regarding our requirements for hybrid materials preparation and device fabrication. Graphene is prepared from graphene oxide by using chemical exfoliation of graphite and microwave irradiation. I am also able to characterize these materials using standard techniques like XRD, HR-TEM, EDAX, FFT, FE-SEM, FT-IR, UV-vis, Photoluminescence etc for standardization. Thin film device fabrication and characterisation is very important part of my research work. Techniques for thin film deposition are layer-by-layer electrostatic self assembly (LBL ESA), spin casting or vacuum deposition. The substrates are functionalised or cleaned ITO coated glass substrate or atomically flat highly doped silicon. I have characterised these thin films by using today’s advanced microscopy techniques like AFM, SEM and STM. For study the electrical properties and device applications, I have measured current-voltage characteristics of these device. I have shown electrical bistability and memory phenomenon of these devices. Using Scanning Tunnelling Microscope, I have measured tunnelling current of monolayer device to probe electrical properties at nanoscale. I have introduced how hybrid organic-inorganic core/shell nanomaterials can decouple the two gaps so that the transport gap of the quantum dots can be tuned without altering the optical gap.
Years of Expertise:
1-5