SD

Soumili Daripa

Banaras Hindu University, Jamshedpur women's college, Jagannath Kishore College

ORCID iD 0009-0007-3882-0249
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About

I am a motivated and hardworking researcher with several years of experience in polymer and electrochemistry. My Ph.D. work is broadly focused on the synthesis, characterization, and applications of polymers, block copolymers (BCP), and their nanocomposites. With this interest, we synthetsized a rod-coil conjugated block copolymer Poly(3-hexylthiphene)-b-polystyrene (P3HT-b-PS) starting from a bifunctional initiator (4-bromobenzylebromide) using two different polymerization process such as Kumada catalyst transfer polymerization (KCTP) and atom transfer radical polymerization (ATRP). In this work, we performed NMR and Gel Permeable Chromatography (GPC) to characterize the final block copolymer. We observed highest field-effect mobility ((2.1 ± 0.75) × 10−3cm2V−1s−1c) of this BCP in toluene in comparison to other solvents due to the unique morphological structure of P3HT-b- PS. Hence, this BCP is found to be a potential candidate for the applications of organic field effect transistor (OFET). Interestingly, this block copolymer is also advantageous for making composites with graphene oxide (GO) that gives proton conductivity up to 0.5 S/cm and high water uptake capacity. To do so, we synthesized a water-soluble BCP, called poly(3-hexylthiophene)-b polystyrenesulphonicacid (P3HT-b- PSSA) by introducing a sulphonic acid group in the polystyrene part of the block. Therefore, P3HT-b- PSSA gets easily coordinated with GO via a noncovalent bond to give a resultant water- soluble rGO/P3HT-b-PSSA sheet. This nanocomposite shows good thermal stability and can also form a highly transparent smooth coating on ITO, quartz, and flexible PET substrates. The best result of proton conductivity is achieved by the self-assembly of the block copolymer nanocomposites. In another work, we prepared hierarchical polyaniline‐MnO2‐rGO ternary nanostructures that show the best capacitance value of 762 F/g at a current density of 1.4 A/g with high electrochemical stability. In another work, we observed that the amphiphilic BCP, polystyrene-b-polyacrylic acid (PS- b-PAA), shows spherical, cylindrical and vesicle like micellar aggregations in the methanol/chloroform mixture with different compositionratio. These micelles were used as a template to fabricate Ag and Pd Nps dip-catalyst that shows high catalytic efficiencies towards reduction reactions and Suzuki coupling. Using standard dyes Rh B as model analytes, we demonstrated that these AgNps decorated BCP shows excellent SERS-based sensing up to 10−6 M concentration with a well-defined calibration curve. We have also made a nanocomposite with a block copolymer, Polystyrene-b-poly (4-vinylpyrydine) (PS-b- P4VP) with pyrene butyric acid (PBA) treated GO. This hybrid material exhibits interesting electrochemical properties in its thin film state, having a thickness of 50 nm. Exploiting such electrochemical properties of this BCP, we detected metal ions such as Hg2+, Ag+, K+, Mg2+ etc., in water. Most of our work includes the synthesis of complex polymer composite materials, extensive characterization using different spectroscopy and microscopy, and their applications in different field. I believe our results will have profound implications in chemistry of polymer nanocomposite materials. Later, we demonstrated that mesoporous Mn3O4 coated rGO shows high-performance supercapacitor applications. We have also made nanocomposites of GO with more than one BCPs, which shows excellent electrochemical behavior. Recently, we reported the synthesis of Mn3O4 nanoclusters decorated graphene hybrid structures and demonstrated their energy storage and electrochemical sensing application for the detection of H2O2. Additionally, we performed electrochemical studies on GO having sulfur-oxygen functional group and used them in electrode material for supercapacitor and electrocatalytic sensing of H2O2 with the detection limit of a few μM range in solution.

Employment

Employment history is unavailable.

Education

  • Banaras Hindu University PhD/Synthesis and studies of some block copolymer and bloc copolymer nanocomposites
    2018 - 2022
  • Jamshedpur women's college M.SC
    2013 - 2015
  • Jagannath Kishore College B.SC
    2010 - 2013

Projects & Funding

Projects & funding information is unavailable.

Publications (11)