Kinetically controlled growth of helical and zigzag shapes of carbon nanotubes

Article Abstract:

A new study investigates the growth mechanism of the multiwalled carbon nanotubes showing helical and zigzag growth morphologies.

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Substrate atomic-termination-induced anisotropic growth of ZnO nanowires/nanorods by the VLS process

Article Abstract:

The effect of substrate surface termination on nanowire growth is demonstrated using the model system of the Sn-crystalyzed growth of ZnO nanostructures on a single-crystal ZnO substrate. The asymmetrical growth features of 1D nanostructures, related to the atomic termination of the substrate, surface charges, and interface adhesion, provides insight into the physical chemical process in the vapor-liquid-solid (VLS) growth.

Science & research, Substrates

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Kinetically controlled growth and shape formation mechanism of platinum nanoparticles

Article Abstract:

The time-dependent shape distribution of platinum nanoparticles during the growth period and its dependence on the concentration of the capping polymer as well as the pH of the solution were investigated using transmission electron microscopy. Results indicate a shape-controlled growth mechanism, wherein the difference between the rate of the catalytic reduction process of Pt(super 2+) on the (111) and (100) faces, the competition between H2 reduction of the Pt(super 2+) complex and polymer capping on the different nanoparticle surfaces and the concentration-dependent buffer action of the polymer itself all determine the final distribution of the different shapes observed.

Usage, Platinum, Transmission electron microscopes, Polymer colloids

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