2004•NanotechnologyOpen access

Transmission electron microscopy of epitaxial PbS nanocrystals on polydiacetylene Langmuir films

Nataly Belman, Amir Berman, Vladimir Ezersky, Y. Lifshitz, Yuval Golan

Abstract

Highly oriented arrays of lead sulfide (PbS) nanocrystals have been prepared in ambient conditions by the exposure of crystalline polydiacetylene (PDA) Langmuir films to H 2 S gas at the air–PbCl 2 solution interface. The nanocrystals were studied by transmission electron microscopy (TEM), electron diffraction (ED), dark field TEM imaging (DF), high resolution TEM (HRTEM) and fast Fourier transform (FFT) analysis of HRTEM images. Three distinct, coexisting orientations were observed with typical nanocrystal morphologies corresponding to each orientation. The direction was aligned parallel to the PDA linear direction for all orientations, indicating a template-directed growth for the PbS/PDA system.

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Key concepts: High-resolution transmission electron microscopy, Lead sulfide, Materials science, Transmission electron microscopy, Nanocrystal, Selected area diffraction, Nanotechnology, Quantum dot