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Koster LJ, Khodabakhsh S, Greenham NC. Controlling the assembly of CdS nanorods via solvent and acidity. Soft Matter. 2014;10(34):6485-90doi: 10.1039/c4sm00728j.
Koster, L. J., Khodabakhsh, S., & Greenham, N. C. (2014). Controlling the assembly of CdS nanorods via solvent and acidity. Soft matter, 10(34), 6485-90. https://doi.org/10.1039/c4sm00728j
Koster, L J A, et al. "Controlling the assembly of CdS nanorods via solvent and acidity." Soft matter vol. 10,34 (2014): 6485-90. doi: https://doi.org/10.1039/c4sm00728j
Koster LJ, Khodabakhsh S, Greenham NC. Controlling the assembly of CdS nanorods via solvent and acidity. Soft Matter. 2014 Sep 14;10(34):6485-90. doi: 10.1039/c4sm00728j. PMID: 25048276.
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Soft Matter. 2014 Sep 14;10(34):6485-90. doi: 10.1039/c4sm00728j.

Controlling the assembly of CdS nanorods via solvent and acidity.

Soft matter

L J A Koster, S Khodabakhsh, N C Greenham

Affiliations

  1. Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, UK.

PMID: 25048276 DOI: 10.1039/c4sm00728j

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.

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