4.4
Emerging Applications
Several applications have been envisaged for nanocrystals, ranging from simple
dyes to magnetic-resonance-imaging contrast agents [160], components of electronic circuitry [33, 161] and magnetic media [115], ingredients in catalyst and
sensors, and so on. All the above applications seek to exploit the tunability provided by the size-dependent properties of the nanocrystals [4]. Before we dwell
upon collective properties in mesostructures, the case of isolated nanocrystals is
briefly discussed.
Fig. 4.22. Colloidal crystals: (a) from FeaPt nanocrystals
(b) Au 55 nanocrystals. A schematic illustration of a Au 55
microcrystal along with the corresponding small angle X-ray
diffraction pattern is shown alongside (reproduced with
permission from [151] and [152]).
4.4 Emerging Applications 77
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