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1. Langmuir–Blodgett Transfer of Nanocrystal Monolayers: Layer Compaction, Layer Compression, and Lattice Stretching of the Transferred Layer

Author

Reken N. Patel, Brian Goodfellow, Andrew T. Heitsch, Detlef-M. Smilgies, and Brian A. Korgel

Subjects
nanocrystals, self-assembly, monolayers, Langmuir–Blodgett transfer, GISAXS, Chemistry, QD1-999
Abstract

Grazing incidence small angle X-ray scattering (GISAXS) was used to study the structure and interparticle spacing of monolayers of organic ligand-stabilized iron oxide nanocrystals floating at the air–water interface on a Langmuir trough, and after transfer to a solid support via the Langmuir–Blodgett technique. GISAXS measurements of the nanocrystal arrangement at the air–water interface showed that lateral compression decreased the interparticle spacing of continuous films. GISAXS also revealed that Langmuir–Blodgett transfer of the nanocrystal layers to a silicon substrate led to a stretching of the film, with a significant increase in interparticle spacing.

Published
2024
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2. Electrostatic charging and manipulation of semiconductor nanowires

Author

Reken N. Patel, Vincent C. Holmberg, and Brian A. Korgel

Subjects
Materials science, Nanostructure, Silicon, business.industry, Mechanical Engineering, Nanowire, chemistry.chemical_element, Germanium, Substrate (electronics), Condensed Matter Physics, Semiconductor, chemistry, Mechanics of Materials, Electric field, Electrode, Optoelectronics, General Materials Science, business
Abstract

It was observed that silicon and germanium nanowires can exhibit significant electrostatic charging and respond strongly to externally applied electric fields. This includes nanowires in air and dispersed in low-conductivity, low-dielectric-constant solvents such as hexane, toluene, and benzene. The electrostatic charging of semiconductor nanowires was investigated as a tool for nanowire manipulation. By charging a substrate, nanowires could be deposited on surfaces with very high coverage and onto selected locations of the surface. The density of deposited nanowires could be adjusted systematically by varying the strength of the electric field. Alternating electric fields, applied between two electrodes, resulted in nanowires oriented with respect to the field orientation.

Published
2011
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3. Wurtzite−Chalcopyrite Polytypism in CuInS2Nanodisks.

Author

Bonil Koo, Reken N. Patel, and Brian A. Korgel

Subjects
*NANOSTRUCTURED materials, *COPPER sulfide, *WURTZITE, *CHALCOPYRITE, *CHLORIDES, *X-ray diffraction, *TRANSMISSION electron microscopy
Abstract

Monodisperse CuInS2nanodisks were synthesized by heating metal chlorides and thiourea in oleylamine. X-ray diffraction showed the predominant phase to be wurtzite (hexagonal) CuInS2instead of chalcopyrite (tetragonal) or compositionally disordered sphalerite (cubic). High-resolution transmission electron microscopy, however, revealed polytypism in the nanodisks, with the wurtzite phase interfaced with significant chalcopyrite domains. [ABSTRACT FROM AUTHOR]

Published
2009
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