Issue 11, 2010

PbSenanocrystalgrowth as nanocubes and nanorods on peptidenanotubesvia different directed-assembly pathways

Abstract

Pb-binding TAR-1 peptides (Ile-Ser-Leu-Leu-His-Ser-Thr) were covalently conjugated on a bolaamphiphile peptide nanotube substrate and the precursors of PbSe were incubated at room temperature. This resulted in the growth of highly crystalline PbSe nanocubes on this biomimetic cylindrical substrate. The growth mechanism to generate nanocubes occurs via the directed self-assembly of nanoparticles and then nanoparticle fusion. The peptide conformation and the cylindrical peptide nanotube substrate play important roles in the mesoscopic crystallization of PbSe nanocubes. Changing the buffer for the peptide immobilization process from 2-(N-morpholino)ethanesulfonic acid to phosphate induces a transformation in the nanocrystal shape from nanocube to nanorods. The conformational change of the TAR-1 peptide on the nanotubes due to the change in the buffer seems to be responsible for aggregating intermediate nanoparticles in different directions for the directed fusion and mesoscopic crystallization of PbSe into the different shapes.

Graphical abstract: PbSe nanocrystal growth as nanocubes and nanorods on peptide nanotubes via different directed-assembly pathways

Article information

Article type
Communication
Submitted
01 Jul 2010
Accepted
28 Jul 2010
First published
13 Sep 2010

Nanoscale, 2010,2, 2373-2376

PbSe nanocrystal growth as nanocubes and nanorods on peptide nanotubes via different directed-assembly pathways

M. Shi, W. Su and H. Matsui, Nanoscale, 2010, 2, 2373 DOI: 10.1039/C0NR00457J

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