Nanocrystals anisotropic growth

Several papers have discussed the role of oriented attachment in the anisotropic growth of nanocrystals. A recent paper by Cho and coauthors [50] discusses the oriented attachment process as the main mechanism involved in the construction of anisotropic PbSe nanocrystals in several shapes. The authors used the proposition of... 

A photochemical reaction of ketone to synthesize gold nanorods in a micellar solution of CTAB consisting of HAuCLt, AgNOa, acetone, and ascorbic acid is possible (34). The presence of ketone is cmcial for the formation of the rods in this case. The UV irradiation leads to the formation of ketyl radicals and the radicals reduce the Au ions to Au°. The Au° act as the nuclei for the anisotropic growth of Au nanocrystals in... 

Another interesting aspect of the solvothermal synthesis of LaP04 YbJir nanocrystals includes the fact that this method allows for the synthesis of anisotropic particles. Ghosh et al. trace the anisotropic growth back to a diffusion model, whereas the surfactant cetyltriammonium bromide (CTAB) blocks certain crystallographic faces of the nuclei selectively [22]. It has to be mentioned that Ghosh et al. have calcined their particles at 900°C, which removed all ligands from the particles surfaces. However, colloidal nanoparticles can be prepared by solvothermal synthesis methods as well. 

L. Manna, L.W. Wang, R. Cingolani, A.P. Alivisatos, First-principles modeling of unpassivated and surfactant-passivated bulk facets of wurtzite CdSe A model system for studying the anisotropic growth of CdSe nanocrystals. J. Phys. Chem. B 109(13), 6183-6192 (2005)... 

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