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Issue 34, 2014
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Controlling the assembly of CdS nanorods via solvent and acidity

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Abstract

We report control over the phase behavior of CdS nanorods via the solvent and acidity. CdS nanorods were synthesized using alkane phosphonic acid ligands, which were replaced after synthesis by a series of aromatic ligands. Change of ligand enabled us to cast films from different solvents. By replacing toluene with ethanol or water the rod–rod interactions dominate over rod–substrate interactions, thereby favoring simple hexagonal ordering (2D). When dispersed in water, a net electrostatic charge on the nanorods could be induced by deprotonating the ligands at high pH. This net charge favors 2D nematic ordering over homeotropic ordering of the nanorods on a substrate. A calculation of the van der Waals and electrostatic interactions is presented that explains the observed influence of solvent and pH.

Graphical abstract: Controlling the assembly of CdS nanorods via solvent and acidity

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Publication details

The article was received on 02 Apr 2014, accepted on 07 Jul 2014 and first published on 21 Jul 2014


Article type: Paper
DOI: 10.1039/C4SM00728J
Citation: Soft Matter, 2014,10, 6485-6490
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    Controlling the assembly of CdS nanorods via solvent and acidity

    L. J. A. Koster, S. Khodabakhsh and N. C. Greenham, Soft Matter, 2014, 10, 6485
    DOI: 10.1039/C4SM00728J

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