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George Chumanov

Dr. George Chumanov Professor
Analytical Chemistry

Phone: (864) 656-2339
Office: 116 Biosystems Research Complex
E-mail: gchumak@clemson.edu

Research Interests | Publications

Dr. Chumanov received his B.S at Moscow Engineering Physics Institute and his Ph.D. (1988) from Moscow State University with Prof. Edward Manykin working in the field of optics and spectroscopy of biomolecules. He was a Postdoctoral Associate at Iowa State University with Prof. T. M. Cotton were he conducted research in bioanalytical applications of Raman spectroscopy. In the last five years, Dr. Chumanov held Research Scientist I position at Ames Laboratory USDOE, where he studied photoinduced electron transfer processes at interfaces.

Research Interests

Dr. Chumanov's research consists of three parts:

1).Preparation and modification of different nanoparticles, including one-, two- and three-dimensional regular structures; investigation of their properties using different spectrochemical techniques together with optical, electron, atomic force and scanning tunneling microscopy; and development of new materials and devices for environmental and biomedical diagnostic applications. The focus is on the preparation, investigation and applications of materials reduced to nanosize (10-7­10-8 meters) dimensions. Such nanomaterials exhibit remarkable chemical and physical properties, many of which have yet to be unveiled. The potential for discovering new principles, ideas and devices of significant practical value drives research in this field. Dr. Chumanov's focus is on metal, metal/semiconductor and metal/dielectric hybrid nanoparticles, which exhibit unique optical properties due to the excitation of so-called plasmon resonances (plasmons). Plasmons can be effectively tuned by changing the size, shape, composition and local environment of nanoparticles. These characteristics make nanoparticles ideal building blocks for the next generation of optical materials, electronic and photonic devices.

2). A broad application of solar cells as a significant energy source requires a balance between cost, stability and efficiency. Rapid evolution of lead halide perovskite solar cells, specifically by increasing power conversion efficiency, brought new potentials for their practical applications. It is well recognized that the quality of perovskite films plays an important role in achieving high efficiency solar cells. We are now trying to use the nanoparticles synthesized in our lab as a simple, reliable and scalable materials for the fabrication of high fabricate efficient planar perovskite solar cells with different structure

3). Consumers, industry, and government are increasingly asking for materials that are made from sustainable and renewable resources that are plentiful in nature and biodegradable. Natural cellulose based products like wood; cotton and rope have been used for thousands of years.  In controlled sulfuric acid hydrolysis, cellulose chains in less ordered or amorphous domains can be decomposed leaving the highly crystalline domain intact.  These highly crystalline cellulose domains are usually in nanometer width and 0.1-2µm length, which are commonly called cellulose nanocrystals (CNC). Derived from the most abundant polymer in nature, CNC are among the most exciting cutting edge materials. Researchers have reported their applications in reinforcing natural and synthetic polymers, paper coating and packaging science. As well as potential applications like antibacterial films, liquid crystals, biomedical implants and many others. Effective methods for transform cellulose into chemicals are gasification, pyrolysis, liquefaction and solidification. Our research now is to test the possibility of using cellulose nanocrystals in a hydrothermal reaction to synthesis carbon nanaotubes, characterize the products from hydrothermal treatment of CNC and their derivatives and then explain how can CNC react into carbon nanotubes.

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Publications

Jin, Y.; Chumanov, G., Solution-Processed Planar Perovskite Solar Cell Without a Hole Transport Layer. ACS Applied Materials & Interfaces 2015, 7, 12015-12021.

Jin, Y.; Chumanov, G., Fabrication of Lead Halide Perovskite Film by Controlling Reactivity at Room Temperature in Mixed Solvents. Chemistry Letters 2014, 43, 1722-1724.

Willett, D.; Chumanov, G., LSPR Sensor Combining Sharp Resonance and Differential Optical Measurements. Plasmonics 2014, 9, 1391-1396.

Heckel, J. C.; Chumanov, G., Depolarized Light Scattering From Single Silver Nanoparticles. Journal of Physical Chemistry C 2011, 115 (15), 7261-7269.

Iyer, K. S.; Zdyrko, B.; Malynych, S.; Chumanov, G.; Luzinov, I., Reversible submergence of nanoparticles into ultrathin block copolymer films. Soft Matter 2011, 7 (6), 2538-2542.

Castro, J.; Pregibon, T.; Chumanov, K.; Marcus, R. K., Determination of catechins and caffeine in proposed green tea standard reference materials by liquid chromatography-particle beam/electron ionization mass spectrometry (LC-PB/EIMS). Talanta 2010, 82 (5), 1687-1695.

Kinnan, M. K.; Chumanov, G., Plasmon Coupling in Two-Dimensional Arrays of Silver Nanoparticles: II. Effect of the Particle Size and Interparticle Distance. Journal of Physical Chemistry C 2010, 114 (16), 7496-7501.

Malynych, S. Z.; Tokarev, A.; Hudson, S.; Chumanov, G.; Ballato, J.; Kornev, K. G., Magneto-controlled illumination with opto-fluidics. Journal of Magnetism and Magnetic Materials 2010, 322 (14), 1894-1897.

Heckel, J. C.; Kisley, L. M.; Mannion, J. M.; Chumanov, G., Synthesis and Self-Assembly of Polymer and Polymer-Coated Ag Nanoparticles by the Reprecipitation of Binary Mixtures of Polymers. Langmuir 2009, 25 (17), 9671-9676.

Henson, J.; Heckel, J. C.; Dimakis, E.; Abell, J.; Bhattacharyya, A.; Chumanov, G.; Moustakas, T. D.; Paiella, R., Plasmon enhanced light emission from InGaN quantum wells via coupling to chemically synthesized silver nanoparticles. Applied Physics Letters 2009, 95 (15).

Hudson, S. D.; Chumanov, G., Bioanalytical applications of SERS (surface-enhanced Raman spectroscopy). Analytical and Bioanalytical Chemistry 2009, 394 (3), 679-686.

Kinnan, M. K.; Kachan, S.; Simmons, C. K.; Chumanov, G., Plasmon Coupling in Two-Dimensional Arrays of Silver Nanoparticles: I. Effect of the Dielectric Medium. Journal of Physical Chemistry C 2009, 113 (17), 7079-7084.

Kumbhar, A. S.; Chumanov, G., Encapsulation of Silver Nanoparticles into Polystyrene Microspheres. Chemistry of Materials 2009, 21 (13), 2835-2839.

Heckel, J. C.; Farhan, F. F.; Chumanov, G., The effect of fructose derived carbon shells on the plasmon resonance and stability of silver nanoparticles. Colloid and Polymer Science 2008, 286 (13), 1545-1552.

Hudson, S. D.; Chumanov, G., Surface Enhanced Raman Scattering and Resonance Elastic Scattering from Capped Single Ag Nanoparticles. Journal of Physical Chemistry C 2008, 112 (50), 19866-19871.

Kinnan, M. K.; Kumbhar, A.; Chumanov, G., Plasma reduction of silver compounds for fabrication of surface-enhanced Raman scattering substrates. Applied Spectroscopy 2008, 62 (7), 721-726.

Malynych, S.; Chumanov, G., Narrow plasmon mode in 2D arrays of silver nanoparticles self-assembled on thin silver films. Journal of Microscopy-Oxford 2008, 229 (3), 567-574.

Ramaratnam, K.; Iyer, S. K.; Kinnan, M. K.; Chumanov, G.; Brown, P. J.; Luzinov, I., Ultrahydrophobic Textiles Using Nanoparticles: Lotus Approach. Journal of Engineered Fibers and Fabrics 2008, 3 (4), 1-14.

Zdyrko, B.; Hoy, O.; Kinnan, M. K.; Chumanov, G.; Luzinov, I., Nano-patterning with polymer brushes via solvent-assisted polymer grafting. Soft Matter 2008, 4 (11), 2213-2219.
Zdyrko, B.; Kinnan, M. K.; Chumanov, G.; Luzinov, I., Fabrication of optically active flexible polymer films with embedded chain-like arrays of silver nanoparticles. Chemical Communications 2008,  (11), 1284-1286.

Chumanov, G., Picorel, R., Ortiz de Zarate, I., Seibert, M. and Cotton, T.M., "Resonance Raman and Surface-enhanced Resonance Raman Spectra of LHII Antenna Complex from Rhodobactor sphaeroides and Ectothiorhodospira sp. excited in the Qx and Qy Transitions,” Photochem. Photobiol., 71, 589-595 (2000).

Dutta, A., Smirnov, A. V., Wen, J., Chumanov, G., and Petrich, J. W., "Multidimensional reaction coordinate for the excited-state H-atom transfer in perylene quinones: importance of the 7-membered ring in hypocrellins A and B" Photochem. Photobiol., 71, 166-172, (2000).

Lin, S., Quaroni, L., White W. S., Cotton, S., and Chumanov, G., "Localization of Carotenoids in Plasma Low-Density Lipoproteins Studied by Surface-Enhanced Raman Spectroscopy", Biopolymers (Biospectroscopy), 57, 249-256 (2000).

Zheng, J. W., Ye, S. Y., Lu, T. H., Cotton, T. M., and Chumanov, G., "Circular Dichroism and Resonance Raman Comparative Studies of Wild Type Cytochrome c and F82H mutant", Biopolymers, 57, 77-84 (2000).

Walsh, R. J., Cotton, T. M., and Chumanov, G., "Silver Coated Porous Alumina as a New Substrate for Surface Enhanced Raman Spectroscopy", J. Raman Spect., 55, 1695-1700 (2001).

Malynych, S., Robuck, H., and Chumanov, G., "Fabrication of Two-Dimensional Assemblies of Ag Nanoparticles and Nanocavities in Poly(dimethylsiloxane) Resin", Nano Letters, 1, 647-649 (2001).

Zheng, J. W., Chumanov, G., and Cotton, T. M., "Photoinduced Electron Transfer at the Surface of Nanosized Silver Nanoparticles as Monitored by EPR spectroscopy", Chem. Phys. Lett., 349, 367-370 (2001).

Malynych, S., Luzinov, I., and Chumanov, G., "Poly(vinylpyridine) as a universal surface modifier for immobilization of nanoparticles", J. Phys. Chem., 106, 1280-1285 (2002).

Gering, J.P., Quaroni, L., and Chumanov, G., "Immobilization of Antibodies on Glass Surfaces Through Sugar Residues", J. Coll. Inter. Sci., 252, 50-56 (2002).

Junwei Zheng, Tianhong Lu, Therese M. Cotton and George Chumanov, “Photoelectrochemical reduction of CO2 mediated with methylviologen at roughened silver electrodes”, J. Electroanal. Chem. 518, 6-12 (2002).

Junwei Zheng, Qun Zhou, Yaoguo Zhou, Tianhong Lu, Therese M. Cotton and George “Chumanov Surface-enhanced resonance Raman spectroscopic study of yeast iso-1-cytochrome c and its mutant”, J. Electroanal. Chem. 530, 75-81 (2002).

Malynych S., Chumanov G. “Light-induced coherent interactions between silver nanoparticles in two-dimensional arrays”, JACS, 125, 2896-2898 (2003).

Malynych S., Chumanov G. “Vacuum Deposition of Silver Island Film on Chemically Modified Surfaces”, J. Vac. Sci. Technol. A, 21, 723-727 (2003).

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