Recent Publications :
2018Investigation of sulfur related defects in graphene quantum dots for tuning photoluminescence and high quantum yield, PR Kharangarh, S Umapathy, G Singh, Applied Surface Science 449, 363-370(2018)
Probing the effect of solvation on photoexcited 2-(2′-hydroxyphenyl) benzothiazole via ultrafast Raman loss spectroscopic studies, S Kayal, K Roy, YA Lakshmanna, S Umapathy, The Journal of Chemical Physics 149 (4), 044310(2018)
Ultrafast Raman Loss Spectroscopy Unravels the Dynamics in Entangled Singlet and Triplet States in Thioxanthone, S Kayal, K Roy, Y Adithya Lakshmanna, S Umapathy, The Journal of Physical Chemistry A 122 (29), 6048-6054(2018)
Method and an apparatus for obtaining sample specific signaturesS Umapathy, SIL Sanchita, J Kiran, US Patent 9,983,136(2018)
Signal Enhancement from Tunable SERS Substrates: Design and Demonstration of Multiple Regimes of Enhancement, DR Nayak, N Bhat, M Venkatapathi, S Umapathy, The Journal of Physical Chemistry C 122 (16), 9134-9140(2018)
Intermolecular Hydrogen Bonding Controlled Intersystem Crossing Rates of Benzophenone, RK Venkatraman, S Kayal, A Barak, AJ Orr-Ewing, S Umapathy, The journal of physical chemistry letters 9 (7), 1642-1648(2018)
Femtosecond coherent nuclear dynamics of excited tetraphenylethylene: Ultrafast transient absorption and ultrafast Raman loss spectroscopic studies, S Kayal, K Roy, S Umapathy. The Journal of chemical physics 148 (2), 024301(2018)
Highly Crystalline Mesoporous C60 with Ordered Pores: A Class of Nanomaterials for Energy Applications, MR Benzigar, S Joseph, H Ilbeygi, DH Park, S Sarkar, G Chandra, ..., Angewandte Chemie 130 (2), 578-582(2018)
Challenges in application of Raman spectroscopy to biology and materials, N Kuhar, S Sil, T Verma, S Umapathy, RSC Advances 8 (46), 25888-25908(2018)
Ordered Mesoporous C70 with Highly Crystalline Pore Walls for Energy Applications, MR Benzigar, S Joseph, AV Baskar, DH Park, G Chandra, S Umapathy, ..., Advanced Functional Materials, 1803701(2018)
Thermal Effect of Sulfur Doping for Luminescent Graphene Quantum Dots, PR Kharangarh, S Umapathy, G Singh, ECS Journal of Solid State Science and Technology 7 (3), M29-M34(2018)
< 2017A Combined Experimental and Theoretical Approach to Understand the Structure and Properties of N‐Methylpyrrolidone‐Based Protic Ionic Liquids, S Panda, K Kundu, S Umapathy, RL Gardas, ChemPhysChem 18 (23), 3416-3428(2017)
Effect of defects on quantum yield in blue emitting photoluminescent nitrogen doped graphene quantum dots, PR Kharangarh, S Umapathy, G Singh, Journal of Applied Physics 122 (14), 145107(2017)
Synthesis and luminescence of ceria decorated graphene quantum dots (GQDs): Evolution of band gap, PR Kharangarh, S Umapathy, G Singh, Integrated Ferroelectrics 184 (1), 114-123(2017)
Understanding Ultrafast Dynamics of Conformation Specific Photo-Excitation: A Femtosecond Transient Absorption and Ultrafast Raman Loss Study, K Roy, S Kayal, V Ravi Kumar, A Beeby, F Ariese, S Umapathy, The Journal of Physical Chemistry A 121 (35), 6538-6546(2017)
High-performance pseudocapacitor electrode materials: cobalt (II) chloride–GQDs electrodes, PR Kharangarh, S Umapathy, G Singh, RK Sharma, A Kumar, Emerging Materials Research 6 (2), 227-233(2017)
Method and a system for detection of hazardous chemicals in a non-metallic container, S Umapathy, SIL Sanchita, J Kiran, US Patent 9,606,062(2017)
Luminescent sensor for copper (II) ion based on imine functionalized monometallic rhenium (I) complexes, A Ramdass, V Sathish, M Velayudham, P Thanasekaran, S Umapathy, ...,Sensors and Actuators B: Chemical 240, 1216-1225(2017)
Mode specific excited state dynamics study of bis (phenylethynyl) benzene from ultrafast Raman loss spectroscopy, K Roy, S Kayal, F Ariese, A Beeby, S UmapathyThe Journal of chemical physics 146 (6), 064303(2017)
In situ monitoring of photostriction in chalcogenide glass film using fiber Bragg grating sensors, S Gayathri, GS Varma, G Singh, BN Shivananju, S Sridevi, S Umapathy,...,International Journal of Optomechatronics 11 (1), 27-35 (2017)
Chemical signature resolved detection of concealed objects, S Umapathy, SIL Sanchita, D Gagan, F Ariese, US Patent App. 15/122,170 (2016)
Impact of ultrathin dielectric spacers on SERS: energy transfer between polarized charges and plasmons, Nayak, D. R., N. Bhat, M. Venkatapathi, and S. Umapathy, Journal of Materials Chemistry C 5, no. 8(2017): 2123-2129.
Raman and Infrared Microspectroscopy: Towards quantitative evaluation for clinical research by ratio metric analysis, S Kumar, T Verma, R Mukherjee, F Ariese, K Somasundaram and S Umapathy, Chem. Soc. Revs., (2016) 45, 1879.
Time-Resolved Spectroscopy, F. Ariese, K. R., V. Ravi Kumar, H. C. Sudeeksha, K Surajit and S. Umapathy, Encyclopedia of Analytical Chemistry, John Wiley and Sons, In Press, 2016
Molecular profiling of Salmonella Typhimurium induced sepsis using Fourier Transform Infrared Microspectroscopy, R Gautam, M Deobagkar-Lele, B Chandrashekar, E Victor, S Majumdar, S Umapathy and D Nandi, J Biophotonics, 9,67 (2016).
Solvent effects on the structure of the triplet excited state of xanthone: A time-resolved resonance Raman study. Ravi Kumar, V.; Umapathy, S., Journal of Raman Spectroscopy, In Press 2016, DOI: 10.1002/jrs.4954.
Triplet excited electronic state switching induced by hydrogen bonding: A transient absorption spectroscopy and time-dependent DFT study. Ravi Kumar, V.; Ariese, F.; Umapathy, S., The Journal of Chemical Physics 2016, 144 (11), 114301.
Molecular dynamics and simulations study on the vibrational and electronic solvatochromism of benzophenone. Ravi Kumar, V.; Verma, C.; Umapathy, S., The Journal of Chemical Physics 2016, 144 (6), 064302.
Ascorbate protects neurons against oxidative stress: A Raman microspectroscopic study, A Dutta, R Gautam, S Chatterjee, S K Sikdar , F Ariese , and S Umapathy, ACS Chemical neuroscience, (2015) 6, 1794. DOI:10.1021/acschemneuro.5b00106
Direct Observation of thermal equilibrium of excited triplet states of 9.10-phenanthrenequinone: A time resolved resonance Raman study, R Venkatraman, N Rajakumar, F Ariese, and S Umapathy, J. Physical Chemistry,A. (2015) 119, 10147. DOI: 10.1021/acs.jpca.5b07972.
Raman and Infrared Imaging: Applications to materials and biology, R Gautam, A Z Samuel, S Sil, D Chaturvedi, A Dutta, F Ariese, S Vanga, , and S Umapathy, Current Science, 108, 341 (2015).
Nuclear magnetic resonance, vibrational spectroscopic studies, physiochemical properties and computational calculations on (nitrophenyl)octa hydroquinolindione by DFT method, M A Pasha, A Siddekha, S Mishra, S H S Azzam and S Umapathy, Spectrochimica Acta A, 136, 221 (2015).
Solvatochromism of 9,10-phenanthrenequinone: An electronic and resonance Raman spectroscopic study, V Ravikumar, N Rajkumar and S Umapathy, J Chem. Phys., 142, 24305 (2015).
Linking carbon metabolism to carotenoid production in mycobacteria using Raman spectroscopy, S Kumar, N Matange, S Umapathy and S S Visweswaraiah, FEMS Microbiology Letters, 362, 1 (2015).
Experimentally validated Raman Monte Carlo Simulation for a cuboid object to substantiate Universal Multiple Angle Raman Spectroscopy for finding hidden/concealed material in containers, V Periasamy, S Sil, G Dhal, F Ariese, S Umapathy, and M Pramanik, J Raman Spectroscopy, 46,669 (2015).
Approaches to data processing methods for multidimensional data from Raman and Infrared spectroscopy, R Gautam, S Vanga, F Ariese and S Umapathy, European Journal of Instrumentation, 2, 1, (2015),doi:10.1140 /epjti/s40485-015-0018-6
Raman spectroscopic studies on facilitating the screening of myopathies, R Gautam, V Sandeep, A Madan, G Narayanappa, U Nangthomba, and S Umapathy, Analytical Chemistry, 87, 2187 (2015).
Surface enhanced Raman spectroscopic studies on biosynthesized silver nanoparticles: observation of picomolar sensitivity to explosives, S Sil, D Chaturvedi, B Keerthi, S Kumar, S N Asthana and S Umapathy, J. Phys. Chem. A, 118, 2904 (2014).
Raman spectroscopy explores molecules hidden in depth: Universal Multiple Angle Spectroscopy, S Sil and S Umapathy, Nature Scientific reports, 4, 2014. (DOI:10.1038/srep05308).
Energy funneling and macromolecular conformational dynamics: a 2D Raman correlation study, A Z Samuel and S Umapathy, Nature (Polymer Journal), 1 (2014).
Structure and Dynamics from time resolved absorption and Raman spectroscopy, S Umapathy, K Roy, S Kayal, Nilesh Rai and Ravi K V, Chapter 3, NATO Series A: Chemistry and Biology, Ed. Judith Howard, Springer, (2014).
Surface enhanced Raman spectroscopic studies of analytes using various approaches, D R Nayak, S Sil, R Gautam, N Bhatt and S Umapathy, ISRAPS Bulletin, vol.26, 1 (2014).
Surface enhanced Raman scattering on anodized alumina templates for biosensing applications, D R Nayak, N Bhatt and S Umapathy, Physics of Semiconductors, Part IV, 577, Springer International Publishing, Switzerland, (2014). DOI: 10.1007/978-3-319-03002-9_145.
Solvent induced changes on the polarity of the triplet excited state of 2- chlorothioxanthone from time resolved absorption and resonance Raman spectroscopy, R Pandey and S Umapathy, Chem. Phys. 478, 175-180(2014).
Is Chemically Synthesized Graphene ‘Really’ a Unique Substrate for SERS and Fluorescence Quenching?. S Sil, N Kuhar, S Chatterjee, and S Umapathy, Nature Scientific reports, 3:3336 and DOI: 10.1038/srep0336 (2013).