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Diffusion-limited aggregation in dry nanocrystal films

Published online by Cambridge University Press:  16 May 2012

Michele Saba*
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato, Italy.
Francesco Quochi
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato, Italy.
Marta Orrù
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato, Italy.
Andrea Mura
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato, Italy. SLACS-CNR/INFM, Università di Cagliari, I-09042 Monserrato, Italy.
Giovanni Bongiovanni
Affiliation:
Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato, Italy. SLACS-CNR/INFM, Università di Cagliari, I-09042 Monserrato, Italy.
*
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Abstract

We demonstrate that drop cast films of colloidal nanocrystals containing excess surfactants develop aggregation over several weeks after solvent evaporation. Fingered structures, typical of diffusion-limited aggregation, are created because of the residual mobility that nanocrystals retain in the film. We are able to control the aggregation through the concentration of surfactant molecules and the drying temperature of the films.

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

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