Mr. Hareesh Dondapati Profile

Hareesh Dondapati

at Norfolk State Univ

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Author

Publications (6)

SPIE Journal Paper | 26 April 2012

Al-doped ZnO aligned nanorod arrays: significant implications for optic and opto-electronic applications

Terence Holloway, Rajeh Mundle, Hareesh Dondapati, Messaoud Bahoura, Aswini Pradhan

JNP, Vol. 6, Issue 01, 063507, (April 2012) https://doi.org/10.1117/12.10.1117/1.JNP.6.063507

KEYWORDS: Zinc oxide, Absorption, Optoelectronics, Aluminum, Heterojunctions, Glasses, Multiple scattering, Nanostructures, Semiconductors, Nanorods

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Proceedings Article | 31 March 2012 Paper

Design of nanostructured-based glucose biosensors

Archana Komirisetty, Frances Williams, Aswini Pradhan, Rajini Konda, Hareesh Dondapati, Diptirani Samantaray

Proceedings Volume 8344, 83440C (2012) https://doi.org/10.1117/12.916943

KEYWORDS: Glucose, Biosensors, Electrodes, Zinc oxide, Sensors, Silver, Platinum, Nanostructures, Titanium, Nanorods

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Proceedings Article | 31 March 2012 Paper

Al-doped ZnO aligned nanorod arrays for opto-electronic and sensor applications

T. Holloway, R. Mundle, H. Dondapati, R. Konda, M. Bahoura, A. Pradhan

Proceedings Volume 8344, 83440A (2012) https://doi.org/10.1117/12.914482

KEYWORDS: Aluminum, Zinc oxide, Heterojunctions, Doping, Photovoltaics, Optoelectronics, Sensors, Thin films, Nanostructures, Nanorods

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Proceedings Article | 31 March 2012 Paper

Remarkable evolution of electrical conductivity in Al:ZnO films

H. Dondapati, R. Mundle, R. B. Konda, M. Bahoura, A. Pradhan

Proceedings Volume 8344, 83441M (2012) https://doi.org/10.1117/12.914639

KEYWORDS: Zinc oxide, Aluminum, Zinc, Sputter deposition, Glasses, X-ray diffraction, Absorption, Crystals, Atomic force microscopy, Thin films

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Proceedings Article | 23 March 2012 Paper

Nanostructured materials for multifunctional applications under NSF-CREST research at Norfolk State University

A. Pradhan, R. Mundle, K. Zhang, T. Holloway, O. Amponsah, D. Biswal, R. Konda, C. White, H. Dondapati, K. Santiago, T. Birdsong, M. Arslan, B. Peeples, D. Shaw, J. Smak, C. Samataray, M. Bahoura

Proceedings Volume 8344, 834403 (2012) https://doi.org/10.1117/12.916959

KEYWORDS: Magnetism, Nanoparticles, Zinc oxide, Silica, Nanostructures, Annealing, Electron beam lithography, Microscopy, Ions, Nanorods

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Magnetic nanoparticles of CoFe₂O₄ have been synthesized under an applied magnetic field through a co-precipitation method followed by thermal treatments at different temperatures, producing nanoparticles of varying size. The magnetic behavior of these nanoparticles of varying size was investigated. As-grown nanoparticles demonstrate superparamagnetism above the blocking temperature, which is dependent on the particle size. The anomalous magnetic behavior is attributed to the preferred Co ions and vacancies arrangements when the CoFe₂O₄ nanoparticles were synthesized under applied magnetic field. Furthermore, this magnetic property is strongly dependent on the high temperature heat treatments, which produce Co ions and vacancies disorder. We performed the fabrication of condensed and mesoporous silica coated CoFe₂O₄ magnetic nanocomposites. The CoFe₂O₄ magnetic nanoparticles were encapsulated with well-defined silica layer. The mesopores in the shell were fabricated as a consequence of removal of organic group of the precursor through annealing. The NiO nanoparticles were loaded into the mesoporous silica. The mesoporous silica coated magnetic nanostructure loaded with NiO as a final product may have potential use in the field of biomedical applications. Growth mechanism of ZnO nanorod arrays on ZnO seed layer investigated by electric and Kelvin probe force microscopy. Both electric and Kelvin force probe microscopy was used to investigate the surface potentials on the ZnO seed layer, which shows a remarkable dependence on the annealing temperature. The optimum temperature for the growth of nanorod arrays normal to the surface was found to be at 600 °C, which is in the range of right surface potentials and energy measured between 500 °C and 700 °C. We demonstrated from both EFM and Kelvin force probe microscopy studies that surface potential controls the growth of ZnO nanorods. This study will provide important understanding of growth of other nanostructures. ZnO nanolayers were also grown by atomic layer deposition techniques. These nanolayers of ZnO demonstrate remarkable optical and electrical properties. These nanolayers were patterned by the Electron Beam Lithography (EBL) technique. A major goal of nanotechnology is to couple the self-assembly of molecular nanostructures with conventional lithography, using either or both bottom-up and top-down fabrication methods, that would enable us to register individual molecular nanostructures onto the functional devices. However, combining the nanofabrication technique with high resolution Electron Beam Lithography, we can achieve 3D bimolecular or/and DNA origami that will be able to identify nucleic acid sequences, antigen targets, and other molecules, as for a perfect nano-biosensor. We have explored some of the nanopatterning using EBL in order to fabricate biomolecule sensing on a single chip with sub nm pitch. The applications are not limited for the bioactivity, but for enhancing immunoreactions, cell culture dishes, and tissue engineering applications.

SPIE Journal Paper | 1 September 2010

Influence of morphological transformation on luminescence properties of europium-doped gadolinium oxide nanostructures

Kai Zhang, Hareesh Dondapati, Terence Holloway, Wei Cao, Arik Kar, Amitava Patra, Aswini Pradhan

JNP, Vol. 4, Issue 01, 043517, (September 2010) https://doi.org/10.1117/12.10.1117/1.3501312

KEYWORDS: Nanostructures, Gadolinium, Europium, Luminescence, Annealing, Oxides, Nanoparticles, Crystals, Heat treatments, Nanorods

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