Dr. Sayantan Maity, Research Associate, Materials for Electronics Technology (C-MET), Pune | Department of Chemistry

Dr. Sayantan Maity, Research Associate, Materials for Electronics Technology (C-MET), Pune

Heteroatom-doping at graphite can alter its electronic property largely, hence changing its function and giving rise of porous framework and number of active sites. In this thesis work, larger atoms than carbon like phosphorous, selenium, sulphur have been doped within graphite using non-graphitic precursors. All the synthesized materials were characterized through various analytical techniques and their applications have been examined in different fields such as catalyst in organic transformation, adsorption of toxic metals, electrochemical sensing of heavy metals and energy storage device as supercapacitor electrode material. Starting from the synthesis of the materials to its applications and reusability, the concept of green and sustainable development has been followed. This Ph. D dissertation is divided into 6 chapters. Chapter 1 is the brief review of the synthesis of heteroatom-doped graphitic materials. In Chapter 2, synthesis of Phosphorous-doped graphite (P-Gc, 3.18 atm% P) from phytic acid under microwave irradiation has been discussed. The application of P-Gc has been demonstrated as a solid catalyst for synthesis of β-ketoenamines and Baeyer–Villiger oxidation. Chapter 3, describes the application of P-Gc as a selective adsorbent of uranium(VI) ions from polluted water. Regeneration of 90% of the adsorbed uranium from P-GC by simple acid treatment has also been discussed. In Chapter 4, synthesis of Selenium-doped graphite (Se-DG, maximum Se load 3.13%) was described from glucose and benzeneseleninic acid under hydrothermal treatment and its application as a green biomimetic catalyst for oxidation reaction using hydrogen peroxide (H2O2). In Chapter 5, electrochemical sensing as well as removal of toxic metal ions such as Hg2+, Hg+ and Cd2+ with Se-DG has been discussed. In Chapter 6, multistep synthesis of Sulphur-doped graphite (S-DG, maximum S load 7.02 atm%) was narrated using cellulose via xanthate formation followed by Leuckart thiophenol synthesis. S-DG was used as a supercapacitor electrode material and the extent of S-doping appeared as the key factor for controlling specific capacitance (CSP).

Email: sm942@snu.edu.in

Profile Summary: 

Ph.D. dissertation, Shiv Nadar University 2021 "Development and Application of Heteroatom-doped Graphitic Materials"

List of publications:

included in the thesis:

1.  S. Maity, F. Ram, B. B. Dhar*, Phosphorous-Doped Graphitic Material as a Solid Acid Catalyst for Microwave-Assisted Synthesis of β-Ketoenamines and Baeyer-Villiger Oxidation, ACS Omega, 2020, 56, 4874-4877.

2. S. Maity, S. Bajpai, B. B. Dhar*, Selective U(VI) Removal Using Phosphorous-doped Graphitic Carbon, J. Environ. Chem. Eng., 2021, 9, 1, 104690.

3. S. Maity, B. B. Dhar*, Peroxide activation by Selenium-doped Graphite, (Manuscript under review).

4. S. Maity, S. Deshmukh, S. S. Roy, B. B. Dhar*, Electrochemical Sensing and Removal of Hg(II) and Cd(II) Ions using Selenium-doped Graphite, (Ready for submission).

5. S. Maity, D. Banerjee, S. S. Roy*, B. B. Dhar*, Hydrothermally Synthesized Sulphur-doped Graphite as Potent Supercapacitor Electrode Material, (Manuscript submitted).

Not included in the thesis:

1. A. K. Dhara, S. Maity, B. B. Dhar*, Visible-Light-Mediated Synthesis of Substituted Phenazine and Phenoxazinone Using Eosin Y as a Photoredox Catalyst, Org. Lett., 2021, 23, 9, 3269 - 3273.

2. S. Maity, B. B. Dhar*, V. Kumar*, Keto-enol Tautomerism Controlled by Phosphorous-Doped Graphitic Materials Through p-p Stacking, (Manuscript under preparation).

3. A. K. Dhara, S. Maity, B. B. Dhar*, Eosin Y Catalyzed Regioselective Synthesis of Benzophenazine Derivatives in Presence of Blue LED, (Manuscript under preparation).

4. M. Goswami*, S. Maity, B. Sahariah, G. Choudhury, A Theoretical Investigation on the Atmospheric Sulfoxides Formation from the Reactions of Reduced Sulfur Species with Criegee Intermediates, (Manuscript under preparation).

Research Advisor: Prof. Basab Bijayi Dhar, Associate Professor

Research Type: 
Graduate