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Hasan, Saad
Ph.D. in Interdisciplinary Materials Science, May 2010

Research Information

Ph.D. Dissertation
Nanoparticles as the Sole Building Blocks of Macroscopic Solids

Ph.D. Advisor
James Dickerson (Physics) and Sandra Rosenthal (Chemistry)

Ph.D. Committee
Sokrates Pantelides (Physics)
Bridget Rogers (Chemical & Biomolecular Engineering)

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Abstract. Colloidal nanoparticles in an assortment of shapes (e.g., spherical, rod-like, tube-like, sheet-like) have been the focus of far-reaching research pursuits due to their attractive material-dependent and size-dependent electronic, optical, and magnetic properties. One approach to deploy these materials in devices is to fabricate them into multilayered thin films. Fabricating thin films over macroscopic dimensions requires controlling the assembly behavior of a very large number of nanoparticles. In addition to understanding the assembly behavior, we were interested in whether this many-particle assembly could exist as a free-standing object. To determine the stability of the nanoparticle assemblies, we used the principles of DLVO theory to calculate the potential energy of the interaction between two particles. 

Nanoparticle films were assembled using electrophoretic deposition. To fabricate free-standing films, we proposed a technique in which particles would be deposited atop a thin sacrificial layer. This technique of sacrificial layer electrophoretic deposition (SLED) was demonstrated by producing macroscopic, free-standing films of hexane-dispersed CdSe and iron oxide nanoparticles and of water-dispersed sheets of exfoliated graphene oxide (eGO). By tuning the pH of the aqueous eGO suspensions, we also demonstrated the fabrication of films with different microstructures, which exhibited both hydrophilic and hydrophobic surface wetting properties.


Selected Publications

Buckypaper fabrication by liberation of electrophoretically deposited carbon nanotubes. Rigueur, JL; Hasan, SA; Mahajan, SV; Dickerson, JH, CARBON, 48, 4090-4099 , (2010)

Field Dependence of the Spin Relaxation Within a Film of Iron Oxide Nanocrystals Formed via Electrophoretic Deposition. Kavich, DW; Hasan, SA; Mahajan, SV; Park, JH; Dickerson, JH, NANOSCALE RESEARCH LETTERS, 5, 1540-1545 , (2010)

Transferable Graphene Oxide Films with Tunable Microstructures. Hasan, SA; Rigueur, JL; Harl, RR; Krejci, AJ; Gonzalo-Juan, I; Rogers, BR; Dickerson, JH, ACS NANO, 4, 7367-7372 , (2010)

Electric field assisted fabrication of carbon nanotube-nanocrystal composite structures
. Dickerson, JH; Mahajan, SV; Hasan, SA; Cho, J; Shaffer, MS; Boccaccini, AR, SPIE Newsroom, , , (2009)

Electrophoretic deposition of CdSe nanocrystal films onto dielectric polymer thin films. Hasan, SA; Kavich, DW; Mahajan, SV; Dickerson, JH, THIN SOLID FILMS, 517, 2665-2669 , (2009)

Sacrificial layer electrophoretic deposition of free-standing multilayered nanoparticle films. Hasan, SA; Kavich, DW; Dickerson, JH, CHEMICAL COMMUNICATIONS, , 3723-3725 , (2009)

Carbon nanotube-nanocrystal heterostructures fabricated by electrophoretic deposition. Mahajan, SV; Hasan, SA; Cho, J; Shaffer, MSP; Boccaccini, AR; Dickerson, JH, NANOTECHNOLOGY, 19, 195301 , (2008)

Controlled electrophoretic deposition of uniquely nanostructured star polymer films. Somarajan, S; Hasan, SA; Adkins, CT; Harth, E; Dickerson, JH, JOURNAL OF PHYSICAL CHEMISTRY B, 112, 23-28 , (2008)

Exchange bias of singly inverted FeO/Fe3O4 core-shell nanocrystals. Kavich, DW; Dickerson, JH; Mahajan, SV; Hasan, SA; Park, JH, PHYSICAL REVIEW B, 78, 174414 , (2008)

 
Vanderbilt University