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Proceedings Paper

Nanostructured materials for multifunctional applications under NSF-CREST research at Norfolk State University
Author(s): A. K. 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
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Paper Abstract

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.

Paper Details

Date Published: 23 March 2012
PDF: 14 pages
Proc. SPIE 8344, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2012, 834403 (23 March 2012); doi: 10.1117/12.916959
Show Author Affiliations
A. K. Pradhan, Norfolk State Univ. (United States)
R. Mundle, Norfolk State Univ. (United States)
K. Zhang, Norfolk State Univ. (United States)
T. Holloway, Norfolk State Univ. (United States)
O. Amponsah, Norfolk State Univ. (United States)
D. Biswal, Norfolk State Univ. (United States)
R. Konda, Norfolk State Univ. (United States)
C. White, Norfolk State Univ. (United States)
H. Dondapati, Norfolk State Univ. (United States)
K. Santiago, Norfolk State Univ. (United States)
T. Birdsong, Norfolk State Univ. (United States)
M. Arslan, Norfolk State Univ. (United States)
B. Peeples, Norfolk State Univ. (United States)
D. Shaw, Norfolk State Univ. (United States)
J. Smak, Norfolk State Univ. (United States)
C. Samataray, Norfolk State Univ. (United States)
M. Bahoura, Norfolk State Univ. (United States)

Published in SPIE Proceedings Vol. 8344:
Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2012
Vijay K. Varadan, Editor(s)

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